newport local flood risk management...5 coordination with the severn river basin management plans 34...

Newport City Council

Newport Local Flood Risk Management

Flood Risk Management Plan

Issue | 14 December 2015

This report takes into account the particular

instructions and requirements of our client.

It is not intended for and should not be relied

upon by any third party and no responsibility

is undertaken to any third party.

Job number 244494-00

4 Pierhead Street

Capital Waterside

Cardiff CF10 4QP

United Kingdom

www.arup.com

| Issue | 14 December 2015

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Contents

Page

List of Acronyms 5

Synopsis 6

1 Introduction 7

2 Purpose of Flood Risk Management Plans in managing flood risk 8

2.1 What is a Flood Risk Management Plan? 8

2.2 What is included in this Plan? 8

2.3 Legislative Context 10

3 Study area 14

3.1 Administrative area 14

3.2 Local flood risk in Newport 21

3.3 Approach to high-level costing of measures 25

4 How Newport City Council currently manages flood risk 26

4.2 How Newport City Council prioritises their work 29

4.3 Who Newport City Council works with to manage flood risk 30

4.4 How this FRMP has been coordinated 31

4.5 Measures already underway to manage flood risk 32

5 Coordination with the Severn River Basin Management Plans 34

6 Newport Flood Risk Management Plan objectives 38

7 How Newport City Council will manage flood risk at a local level 40

7.1 Overview of local flood risk 40

7.2 Common local flood risk management measures 51

7.3 Allt-Yr-Yn Ward 56

7.4 Alway Ward 61

7.5 Beechwood Ward 66

7.6 Bettws Ward 71

7.7 Caerleon Ward 76

7.8 Gaer Ward 81

7.9 Graig Ward 86

7.10 Langstone Ward 91

7.11 Liswerry Ward 97

7.12 Llanwern Ward 102

7.13 Malpas Ward 107





7.14 Marshfield Ward 112

7.15 Pillgwenlly Ward 117

7.16 Ringland Ward 121

7.17 Rogerstone Ward 126

7.18 Shaftesbury Ward 131

7.19 St Julians Ward 137

7.20 Stow Hill Ward 142

7.21 Tredegar Park Ward 147

7.22 Victoria Ward 152

8 Implementation and Delivery 157

8.1 Summary of Measures 157

8.2 Implementation Programme 157

8.3 Measure justification 158

8.4 Funding for Local Flood Risk Management 158

8.5 Environmental Influences on Measures 161

9 Public Consultation 164

9.1 Consultation on the Draft Local Flood Risk Management Plan 164

9.2 Further Consultation 165

10 Monitoring and review 166

Tables

Table 1 – Summary of relevant plans and lead RMAs

Table 2 – Definition of ‘non-residential’ and ‘essential service’ property type

Table 2 - Total counts of features in NCC

Table 3 - NCC Local Flood Risk Management Strategy Measures

Table 4 - Table outlining the primary roles of RMAs operating within Newport.

Table 5 – Definitions of measures, used for reporting within the Floods Directive.

Table 6 – Mapping interdependencies between Management Plan measures.

Table 7 - Objectives of the National FRM Strategy and the NCC LFRMS

Table 8 – Top five ranked wards, by proportion of properties at predicted flood risk (depth>0.2m)

Table 9 – Summary of the predicted risk from surface water to a range of receptors.

Table 10 - Estimated residents in areas at risk of flooding depth >0.0m

Table 11 - Residential Properties at risk of internal flooding depth >0.2m

Table 12 – Total features at high risk of surface water flooding (greater than a 1 in 30 chance of flooding in any year)





Table 13 - Total features at medium risk of surface water flooding (between 1 in 30 and 1 in 100 chance of flooding in any year)

Table 14 - Total features at low risk of surface water flooding (between 1 in 100 and 1 in 1000 chance of flooding in any year)

Table 15 – Summary of Borough-wide Measures

Table 16 – Recorded historic local flooding in Allt-yr-yn

Table 17 – Flood risk map counts for Allt-yr-yn

Table 18 – Local flood risk management measures for Allt-yr-yn

Table 19 – Recorded historic local flooding in Alway

Table 20 – Flood Risk Map counts for Alway

Table 21 - Local Flood Risk Management measures for Alway

Table 22 – Recorded historic local flood events in Beechwood

Table 23 – Flood Risk Mapping counts for Beechwood

Table 24 - Local Flood Risk Management measures for Beechwood

Table 25 – Recorded historic flooding in Bettws

Table 26 – Flood Risk Map counts for Bettws

Table 27 – Local Flood Risk Management measures for Bettws.

Table 28 – Recorded historic ordinary watercourse flooding in Caerleon

Table 29 – Recorded historic surface water flooding in Caerleon

Table 30 - Flood Risk Map counts for Caerleon

Table 31 - Local Flood Risk Management measures for Caerleon

Table 32 - Flood Risk Map counts for Gaer

Table 33 – Local Flood Risk Management measures identified for Gaer

Table 34 - Flood Risk Map counts for Graig

Table 35 – Local flood risk management measures for Graig

Table 36 – Flood Risk Map counts for Langstone.

Table 37 – Local flood risk management measures for Langstone.

Table 38 – Flood Risk Map counts for Liswerry

Table 39 – Local Flood Risk Management measures for Liswerry

Table 40 – Flood Risk Map counts for Llanwern

Table 41 – Local Flood Risk Management measures for Llandwern

Table 42 – Flood Risk Map counts for Malpas

Table 43 – Local Flood Risk Management measures for Malpas

Table 44 – Flood Risk Map counts for Marshfield.

Table 45 – Local Flood Risk Management measures for Marshfield

Table 46 – Flood Risk Map counts for Pillgwenlly

Table 47 – Local Flood Risk Management measures for Pillgwenlly

Table 48 – Flood Risk Map counts for Ringland

Table 49 – Local Flood Risk Management measures for Ringland

Table 50 – Flood Risk Map counts for Rogerstone

Table 51 – Local Flood Risk Management measures for Rogerstone

Table 52 – Flood Risk Map counts for Shaftesbury

Table 53 – Local Flood Risk Management measures for Shaftesbury





Table 54 – Flood Risk Map counts for St Julians

Table 55 – Local Flood Risk Management measures for St Julians

Table 56 – Flood Risk Map counts for Stow Hill

Table 57 – Local Flood Risk Management measures for Stow Hill

Table 58 – Flood Risk Map counts for Tredegar Park

Table 59 – Local Flood Risk Management measures for Tredegar Park

Table 60 – Flood Risk Map counts for Victoria

Table 61 – Local Flood Risk Management measures for Victoria

Table 62 – Summary of local flood risk management proposed measures across NCC

Appendices

Appendix A

Historic Local Flood Events





Page 5

List of Acronyms

CIL Community Infrastructure Levy

DCWW Dŵr Cymru Welsh Water

Defra Department for Environment, Food and Rural Affairs

EC European Commission

ERDF European Regional Development Fund

EU European Union

FCERM Flood and Coastal Erosion Risk Management

FDGiA Flood Defence Grant in Aid

FWMA Flood and Water Management Act 2010

FTE Full Time Equivalent

GIS Geographical Information Systems

HRA Habitat Regulations Assessment

IDB Internal Drainage Board

LFRMP Local Flood Risk Management Plan

LFRMS Local Flood Risk Management Strategy

LLFA Lead Local Flood Authority

LRF Local Resilience Forum

NCC Newport City Council

NFM Natural Flood Management

PFRA Preliminary Flood Risk Assessment

RBMP River Basin Management Plan

RMA Risk Management Authorities

SEA Strategic Environmental Assessment

SFCA Strategic Flood Consequences Assessment

SMP Shoreline Management Plan

TAN Technical Advice Note

WCMC Wales Coastal Monitoring Centre

WFD Water Framework Directive





Page 6

Synopsis

Newport City Council (NCC) is a designated Lead Local Flood Authority (LLFA)

under the Flood and Water Management Act (FWMA) 2010. NCC has joined all

the LLFAs across Wales in opting to prepare a Flood Risk Management Plan

(FRMP) to ensure a consistent approach.

Surface water flooding is not a significant flooding mechanism for many parts of

Newport as fluvial and/or tidal flooding presents a more significant risk. However

it presents a residual risk and, often exacerbated by blockages, localised surface

water flooding in a few locations is relatively frequent. Notable historic surface

water flooding includes the City Centre in 1997, Gaer Vale in 2000 and across the

Borough in 2014. Surface water drainage issues can be exacerbated by high tides

in the Severn and Usk Estuary causing river or drainage systems to back up and

occasionally flood. This is a particular issue on the low-lying Caldicot and

Wentlooge levels. The wards with the highest proportion of properties at predicted

surface water flood risk are Alway, Allt-yr-Yn, Bettws, Graig and Ringland.

The Plan gives an overview of the flood risk from local sources in the borough

consisting of surface water, groundwater and ordinary watercourses. Flood risk

arising from Main Rivers, sea and reservoirs in Newport, and ordinary

watercourses in the Caldicot and Wentlooge Level drainage districts are the

responsibility of Natural Resources Wales.

This Plan describes detailed objectives and measures which will ensure local

flood risk in the borough is reduced during the next 6 years, after which the Plan

will be reviewed.

Flood risk management activities in the Borough have primarily been historically

funded through government grants. However moving forwards, a partnership

approach will be required. Implementing the measures will depend on securing

sufficient funding. Failure to receive additional funding could result in measures

identified not being implemented in part or full, or delayed.

Ove Arup & Partners Limited (Arup) have been commissioned by NCC to support

the preparation of this plan. Arup cannot accept liability for the accuracy or

otherwise of information derived from secondary sources, however, endeavours

have been made to verify the suitability and appropriateness of information

obtained in this way.

The report has been prepared to comply with the Welsh Local Government

Association’s FRMP template.





Page 7

1 Introduction

The Flood Risk Regulations 2009 placed a duty on Lead Local Flood Authorities

(LLFAs) to produce a Flood Risk Management Plan (FRMP) for all Flood Risk

Areas1. Whilst no Flood Risk Area was identified in the borough, Newport City

Council (NCC) joins all LLFAs across Wales in opting to prepare a FRMP to

ensure a consistent approach.

This FRMP gives an overview of the flood risk in the borough. NCC’s high-level

objective is to work to reduce flood risk where significant local flood risk has

been identified. Detailed objectives and measures are described which will ensure

flood risk in the borough is reduced during the next 6 years, after which this plan

will be reviewed.

NCC staff have drawn on their experience and knowledge in the production of

this plan to ensure NCC will manage local flood risk in an efficient and cost

effective way. This is the first cycle of the Flood Risk Regulations. Lessons will

be learnt from the challenge of delivering flood risk management interventions

acceptable within Newport’s communities whilst attracting appropriate funding

from Welsh Government and other sources.

The predominant flood risk throughout much of Newport is from the Rivers Usk

and Ebbw, and tidal flooding from the Severn Estuary. Flood risk from surface

water and ordinary watercourses is localised, exacerbated by blockages and/or

high tides restricting drainage.

This plan covers flooding from surface water, groundwater, ordinary watercourses

and the interface with river flooding. Flood risk arising from Main Rivers, sea and

reservoirs in Newport is the responsibility of Natural Resources Wales (NRW)

and their proposals are contained within the Severn River Basin District FRMP.

Ordinary watercourses in the Caldicot and Wentlooge Level drainage districts are

the responsibility of NRW.

1 Map of agreed Flood Risk Areas in England and Wales. Available at:

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/307085/FRMPs_Fl

ood_Risk_Areas.pdf. Accessed 17/08/15

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/307085/FRMPs_Flood_Risk_Areas.pdf

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/307085/FRMPs_Flood_Risk_Areas.pdf





Page 8

2 Purpose of Flood Risk Management Plans

in managing flood risk

2.1 What is a Flood Risk Management Plan?

The natural hazard of flooding risks the safety and sustainability of communities.

Some 1 in 5 of the population is estimated to be at risk of flooding across Wales2.

Managing this risk through careful planning is important to minimise the risk to

communities. Flood risk management planning allows Risk Management

Authorities (RMAs) to develop a better understanding of risk from all sources of

flooding and agree priorities to manage that risk.

This FRMP sets out how NCC will over the next 6 years manage flooding from

local sources so that the communities most at risk and the environment benefit the

most. In doing so, this FRMP takes forward the objectives and actions set out in

NCC’s Local Flood Risk Management Strategy3 (LFRMS).

This FRMP also sets out to meet the relevant objectives in the Welsh

Government’s National Flood and Coastal Erosion Risk Management Strategy4.

This provides the national framework for flood and coastal erosion risk

management in Wales through four overarching objectives:

Reducing the consequences for individuals, communities, businesses and the

environment from flooding and coastal erosion;

Raising awareness of and engaging people in the response to flood and

coastal erosion risk;

Providing an effective and sustained response to flood and coastal erosion

events; and

Prioritising investment in the most at-risk communities.

2.2 What is included in this Plan?

The information within this FRMP includes the components set out in the EU

Flood Directive. Most information has been gathered and updated through this

first cycle, drawn from the findings of NCC’s Preliminary Flood Risk Assessment

(PFRA) and the measures NCC set out in their LFRMS.

This FRMP sets out objectives for the management of flood risk from local

sources within the borough. The objectives focus on reducing the adverse

consequences of flooding for human health, the environment, cultural heritage and

economic activity.

2 Summary national flood and coastal erosion risk management strategy: Wales. Available from:

http://gov.wales/docs/desh/publications/120412nssummaryen.pdf Accessed on 02/09/15. 3 Newport City Council Local Flood Risk Management Strategy. Available at

http://www.newport.gov.uk/documents/Policies/Newport-LFRMS-Report-Issue-Rev.pdf Accessed

on: 17/08/15 4 National Strategy for Flood and Coastal Erosion Risk Management. Available at

http://wales.gov.uk/topics/environmentcountryside/epq/flooding/nationalstrategy/strategy/?lang=e

n Accessed on: 24/07/15

http://gov.wales/docs/desh/publications/120412nssummaryen.pdf

http://www.newport.gov.uk/documents/Policies/Newport-LFRMS-Report-Issue-Rev.pdf

http://wales.gov.uk/topics/environmentcountryside/epq/flooding/nationalstrategy/strategy/?lang=en

http://wales.gov.uk/topics/environmentcountryside/epq/flooding/nationalstrategy/strategy/?lang=en





Page 9

This report highlights the areas predicted to be at risk from surface water flooding,

groundwater flooding and ordinary watercourses in the borough. This report sets

out the measures NCC will take over the next 6 years to mitigate these risks

through prevention, protection, preparedness, and recovery and review to make

Newport’s communities more resilient. This includes non-structural measures to

reduce the consequence of flooding, including raising awareness and

understanding of local flooding issues.

2.2.1 Production of surface water flood hazard and flood risk

maps

In 2013 the Environment Agency, working with NRW and LLFAs, produced the

updated Flood Map for Surface Water5. The updated Flood Map for Surface

Water assesses flooding scenarios as a result of rainfall with the following chance

of occurring in any given year:

1 in 30 (3%)

1 in 100 (1%)

1 in 1000 (0.1%)

JBA Consultants were contracted to produce the maps on behalf of the EA, NRW

and LLFAs.

The results were based on the 1, 3 and 6 hour rainfall duration model results for

each return period which have then been combined on a worst-case basis to form a

‘critical storm duration’ dataset. Shallow/lowest hazard flooding, flooded areas of

less than 100m2 and dry areas surrounded by water less than 50m2 had been

removed.

The updated map provides the following data for each flooding scenario:

Flood extent and depth

Flood velocity (including flow direction at maximum velocity)

Flood hazard (as a function of depth and velocity)

Consistent with the Flood Risk Regulations, the flood risk classifications are:

High risk – greater than a 1 in 30 chance of flooding in any year

Medium risk – between 1 in 30 and 1 in 100 chance of flooding in any year

Low risk – between 1 in 100 and 1 in 1000 chance of flooding in any year

2.2.2 Limitations with surface water flood hazard and flood

risk maps

The Environment Agency’s updated Flood Map for Surface Water represents an

improvement on the previous surface water flood maps, however predictions

remain general in nature and limitations with prediction are summarised below:

5 Flood maps for surface water. Available at: https://naturalresources.wales/our-evidence-and-

reports/maps/flood-risk-map/?lang=en. Accessed 17/08/15.

https://naturalresources.wales/our-evidence-and-reports/maps/flood-risk-map/?lang=en

https://naturalresources.wales/our-evidence-and-reports/maps/flood-risk-map/?lang=en





Page 10

Due to the modelling techniques used, the mapping picks out depressions in the

ground surface and simulates some flow along natural drainage channels, rivers,

low areas in floodplains, and flow paths between buildings. Although the maps

appear to show flooding from ordinary watercourses, they should not be taken as

definitive mapping of flood risk from these as the conveyance effect of ordinary

watercourses or drainage channels is not explicitly modelled. Also, structures

(such as bridges, culverts and weirs) and flood risk management infrastructure

(such as defences) are not represented6.

The predictions should be viewed at a high level and are not suitable for

assessment of the risk to individual properties. It should also be noted that the

maps present the ‘current day’ scenario with no allowance made for the effects of

climate change or urban creep.

2.3 Legislative Context

2.3.1 Flood Risk Regulations 2009

The purpose of the Flood Risk Regulations is to transpose the European

Commission (EC) Floods Directive (2007/60/EC), on the assessment and

management of local flood risk, into domestic law in England and Wales and to

implement its provisions. The Regulations set out a six year cycle with timescales

for reporting to the European Commission and the publication of 3 key outputs,

Figure 1.

Figure 1: Flood Risk regulations (2009) timescale7

The Regulations require NRW to prepare Directive deliverables associated with

flood risk arising from Main Rivers, the sea and reservoirs, and the LLFAs to do

the same for flood risk associated with local sources such as surface water,

groundwater and ordinary watercourses.

6 Flood maps for surface water: how they were produced. Available at:

https://www.gov.uk/government/publications/flood-maps-for-surface-water-how-they-were-

produced Accessed 17/08/15 7 Source: Welsh Local Government Association FRMP Template

https://www.gov.uk/government/publications/flood-maps-for-surface-water-how-they-were-produced

https://www.gov.uk/government/publications/flood-maps-for-surface-water-how-they-were-produced





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2.3.2 Preliminary Flood Risk Assessment

The PFRA compiled information on significant local flood risk from past and

future floods, based on readily-available information. The scope of the PFRA was

a high-level screening exercise. Flooding from surface runoff, ground water and

ordinary watercourses, and any interaction these sources have with Main Rivers

was considered in order to identify flood risk areas as set out under the European

Flood Directives (Section 3.3).

NCC’s PFRA did not identify any areas of significant flood risk that satisfied the

significance criteria8 set by the Welsh Government. An Indicative Flood Risk

Area in Rogerstone has been removed during the PFRA process as it was deemed

as not having a significant present or future flood risk. This is a cross boundary

flood risk area shared with the neighbouring LLFA of Caerphilly County Borough

Council.

Newport’s PFRA is to be made available on NCC’s website.

2.3.3 Flood Risk Management Plans for Flood Risk Areas

LLFAs have a duty to prepare FRMPs for Flood Risk Areas identified in PFRAs.

NCC are currently in the first cycle of the Regulations and FRMPs represent the

final output of this cycle and must be published by December 2015. Whilst no

Flood Risk Area was identified in the borough, NCC joins all LLFAs across

Wales in opting to prepare a FRMP to ensure a consistent approach.

2.3.4 Flood and Water Management Act

The FWMA was introduced in April 2010 in England and Wales. It was intended

to implement Sir Michael Pitt’s recommendations following the widespread

flooding of 2007. The FWMA was also intended to clarify roles and

responsibilities between RMAs.

Under the FWMA, the Welsh Government produced a National Strategy for Flood

and Coastal Erosion Risk Management9 in January 2013.

LFRMS were created to define who the RMAs are, what their functions are, and

what their responsibilities are. LFRMS underwent public consultation. LFRMS

also must be consistent with the National Strategy for flood and Coastal Erosion

Management. NCC produced a LFRMS in October 2014.

2.3.5 Water Framework Directive

The Water Framework Directive came into force on 22 December 2000 and was

introduced by the European Commission (EC). Under the directive, member states

8 Indicative Flood Risk Areas have been identified where more than 5,000 people are at risk of

flooding 9 National Strategy for Flood and Coastal Erosion Risk Management in Wales. Available at:

http://gov.wales/topics/environmentcountryside/epq/flooding/nationalstrategy/strategy/?lang=en.

Accessed 11/08/15.

http://gov.wales/topics/environmentcountryside/epq/flooding/nationalstrategy/strategy/?lang=en





Page 12

are required to improve the management of water bodies with the aim of

achieving improved chemical and ecological status in inland and coastal waters by

2015. The requirements of this directive are implemented in the UK via the Water

Environment Regulations 2003. In addition to improving water quality, the

regulation also promotes sustainable use of water as a natural resource, and

encourages relevant authorities to conserve habitats and species that are dependant

directly on water.

The ecological and chemical status are assessed according to the following

criteria:

Biological quality (fish, benthic invertebrates, aquatic flora);

Hydromorphological quality such as river bank structure, river continuity or

substrate of the river bed;

Physical-chemical quality (temperature, oxygenation and nutrient conditions);

Chemical quality that refers to environmental quality standards for river basin

specific pollutants.

To meet the requirements of the Directive, NRW have produced a management

plan for each of the three River Basin Districts in Wales. The River Basin

Management Plan for the Severn River Basin District is applicable to the

administrative boundary of NCC. This management plan outlines the measures

that NRW are likely to implement to meet the requirements of the Directive.

Specific measures, particularly structural measures, associated with managing

local flood risk and coastal erosion will have to comply with the requirements of

the Directive. As part of the on-going liaison between NCC and Natural

Resources Wales, once specific measures are designed, these will be

communicated to NRW for advice. In this way, NCC will consider how the

strategy could assist, and benefit from, the delivery of the Water Framework

Directive targets of achieving ‘good’ status for each waterbody in terms of

quantity and ecological quality.





Page 13

2.3.6 Summary of relevant plans and lead Risk Management

Authorities

Table 1 – Summary of relevant plans and lead RMAs

Plan or Strategy Purpose or scope Drivers Lead RMA

National Strategy

for Flood and

Coastal Erosion

Risk Management

Sets out policies on flood and

coastal erosion risk

management in Wales

Statutory

requirement under

the FWMA.

Welsh

Government

FRMP Builds on the PFRA to set out

how flooding from rivers and

the sea (NRW / EA) or surface

water, ground water and

ordinary watercourses (LLFA)

will be managed over a 6-year

cycle.

Statutory

requirement and

timescales under

the Flood Risk

Regulations

LLFA (local flood

risk) and NRW

(rivers and the sea)

(or EA in

England)

LFRMS Sets out objectives and high-

level measures for the

management of surface water,

groundwater and ordinary

watercourse flood risk.

Statutory

requirement under

the FWMA.

LLFA

CFMP Sets out preferred flood risk

management policies for river

flooding.

Voluntary NRW (or EA in

England)

RBMP Sets out a framework to

delivery of WFD objectives.

Statutory

requirement under

the WFD.

NRW (or EA in

England)





Page 14

3 Study area

3.1 Administrative area

NCC is a Unitary Authority located in South East Wales and covers an area of

approximately 218km2. It is bordered by four other LLFAs (Figure 2);

Monmouthshire County Council, Torfaen County Borough Council, Caerphilly

County Borough Council and Cardiff City Council.

The study area is within the Severn River Basin District and is served by Dŵr

Cymru Welsh Water (DCWW) and NRW. NRW took over the duties of the

Caldicot and Wentlooge Level Internal Drainage Board in April 2015.

NCC has 20 wards with a total population of 146,600 (2013 census), some 4.8%

of the total population of Wales. The number of residential properties within

Newport is 63,400.

Figure 2: NCC administrative area and surrounding LLFA areas10

10 Source: URS Newport City Council – Preliminary Flood Risk Assessment: Preliminary

Assessment Report (2011).





Page 15





Page 16

3.1.1 List of features used in counts to assess flood risk

Guidance on FRMP preparation is available from the Environment Agency11,

NRW and Welsh Local Government Association. This includes details of the

features to be considered when evaluating flood risk from surface water and

ordinary watercourses. The features have been divided into three categories; Risk

to People, Risk to Economic Activity, and Risk to Natural and Historic

Environment. Table 3 lists all features and the total counts for each ward within

Newport.

Counts of features at predicted flood risk were carried out in accordance with The

updated Flood Map for Surface Water (uFMfSW) Property Points dataset

(Environment Agency, 2014).

The following datasets were used to generate the counts:

National Receptors Dataset (2012) - contains data on listed buildings,

scheduled ancient monuments, registered parks and gardens, environmental

permitting sites, trunk or primary roads, railways, SSSI’s.

uMfSSF Property Point Dataset - contains residential and non-residential

property point data within an area. In addition to the standard OS address layer

property data, the dataset provides details of the percentage of a perimeter that

is wetted in a 1 in 30, 1 in 100, and 1 in 1000 rainfall event at 6 different

depths: 0mm, 150mm, 200mm, 300mm, 600mm and 900mm.

A multiplier of 2.32 people per property has been used to estimate the number of

residents at risk. Each ward’s population has been also included in the report for

comparison, sourced from the Office for National Statistics (ONS) 2012 Mid-

Year Population Estimate.

Doorway and access threshold levels are an important factor in determining the

susceptibility of properties to flooding. In the absence of survey data, a typical

value of 200mm is often assumed. The report therefore considers residential

properties at risk of internal surface water flooding when flood waters are

predicted to exceed a depth of 0.2m.

It should be noted that feature counts are cumulative i.e. the total number of

features at medium risk include the total number of features at high risk.

‘Non-residential property’ and ‘essential services’ are defined in the table below

on the basis of Ordinance Survey property class.

11 Flood risk management plans (FRMPs): how to prepare them. Available at:

https://www.gov.uk/guidance/flood-risk-management-plans-frmps-how-to-prepare-them Accessed

20/07/15

https://www.gov.uk/guidance/flood-risk-management-plans-frmps-how-to-prepare-them





Page 17

Table 2 – Definition of ‘non-residential’ and ‘essential service’ property type

Non-Res Ser. Non-Res Ser.

Airfield Electricity Generating

Almshouse Employment Agency

Ambulance Station Engineering Works

Arena Equestrian Training

Art Centre Estate Agency

Art Gallery Factory

Bakery Farming

Bank Filling Station

Bar Financial & Prof. Services

Betting Office Fire Station

Boat House Fitness Club

Bowling Football

Brewery Forge

British Legion Club Garage

Builders Garden Centre

Builders Merchant Gas Production & Distribution

Building Society Gas Regulating

Bus Depot Gas Storage

Bus Station General Commercial

Café Golf

Camping Government Office

Car Dealer Graving Dock

Car Hire Guest House

Car Wash Hairdresser

Caravanning Hall

Cash And Carry Health Centre

Cathedral Health Club

Cattery High School

Cemetery Higher Education

Central Gov. Office Hire Shop

Chapel HM Prison

Chemical Works Hopper

Chemist Horticultural Nursery

Children’s Nursery Hospice

Church Hospital

Clinic Hostel

Club Hotel

Club House Industry & Business Services

Community Centre Infant School

Community Hall Inn

Cooling Insurance Broker

Crematorium Iron Works

Cricket Job Centre

Crown Court Joinery

Dairy Junior School

Day Care Kennels

Dental Surgery Kingdom Hall

Department Store Launderette

Depot Laundry

Distribution Leisure Centre

Dog Pound Library

Dry Cleaners Local Government Office

Dry Dock Mill

Education Mosque





Page 18

Non-Res Ser. Non-Res Ser.

Museum Smithy

Nightclub Snooker

Nursery Social Club

Nursing Home Social Services

Office Sorting Office

Parish Hall Sports

Place Of Worship Sports Pavilion

Police Services Sports Viewing

Police Station Stables

Post Office Steel Works

Postal Distribution Storage

Pre School

Education Sunday School

Presbytery Supermarket

Primary School Surgery

Printing Works Take Away

Probation Centre Tank

Public Convenience Taxi Business

Public House Telecommunications

Public Recycling Television Studio

Pump House Tennis

Pumping Territorial Army

Putting Testing

Quay Theatre

Railway Station Timber Storage

Recording Studio Tourist Information

Recreation Ground Tower

Recycling Trade Distribution

Repair Centre Training

Research Travel Agency

Rest Home Tyre Depot

Restaurant University

Retail Park Vehicle Driver Training

Retail Warehouse Vehicle Testing

Road Haulier Ventilating

Rugby Football Veterinary Surgery

Sailing Vicarage

Sandwich Bar Water Distribution

School Water Filtration

Secondary School Water Regulating

Service Station Water Settling

Shelter Water Treatment

Ship Freight Welfare Services

Shopping Wholesale Market

Works





Page 19

Table 3 - Total counts of features in NCC

All

t-y

r-Y

n

Alw

ay

Bee

chw

oo

d

Bet

tws

Ca

erle

on

Ga

er

Gra

ig

La

ng

sto

ne

Lis

wer

ry

Lla

nw

ern

Ma

lpa

s

Ma

rsh

fiel

d

Pil

lgw

enll

y

Rin

gla

nd

Ro

ger

sto

ne

Sh

aft

esb

ury

St.

Ju

lia

ns

Sto

w H

ill

Tre

deg

ar

Pa

rk

Vic

tori

a

People and Property

Residential Properties (n) 3,907 3,337 3,401 3,359 3,555 3,959 2,485 1,759 5,099 1,254 3,422 2,555 3,148 3,809 4,339 2,461 3,790 2,412 1,934 3,138

Essential Services (n) 66 22 27 31 67 36 25 59 168 149 27 69 108 29 50 28 29 99 12 40

Economic Activity

Non-Residential Properties (n) 136 69 60 30 154 50 33 50 385 47 29 119 423 24 76 129 177 503 9 193

Primary/Trunk Roads (km) 48.5 27.2 28.1 28.3 69.3 37.5 54.3 114.5 80.8 75.4 31.5 128.2 47.4 38.9 61.5 29.7 31.7 29.9 21.5 18.6

Main Line Railways (km) 0.00 0.37 0.00 0.00 3.70 3.47 6.81 0.00 7.10 5.66 0.00 5.95 5.43 0.00 3.59 0.01 2.70 3.39 1.21 1.05

Agricultural Land - Grades 1, 2 & 3 (ha) 383 177 150 513 1394 281 1434 3035 1514 3988 206 3538 548 243 865 163 195 131 180 94

Natural and Historic Environment

Special Areas of Conservation (SAC) (ha) 0.00 0.00 2.45 0.00 62.94 0.00 0.00 15.44 128.29 37.30 3.41 117.64 72.87 0.00 0.00 10.67 28.77 7.09 0.00 9.33

Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 34.95 37.30 0.00 117.63 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 34.95 37.30 0.00 117.63 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Sites of Special Scientific Interest (ha) 0.00 0.00 2.45 0.00 63.93 0.00 3.76 72.09 706.70 2541.10 3.41 1882.25 84.12 0.00 0.00 10.80 28.83 7.07 24.34 9.33

Sites of Interest for Nature Conservation (ha) 47.86 20.25 1.77 79.48 166.02 43.25 149.44 641.88 328.58 339.24 12.37 25.38 8.26 13.15 130.23 13.43 38.22 0.00 2.48 0.00

National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 23.98 220.04 221.27 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Local Nature Reserves (LNR) (ha) 19.98 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Ancient Woodland (ha) 8.04 3.36 0.00 37.14 47.99 0.00 212.00 502.93 0.00 94.46 3.22 7.13 0.00 10.49 136.23 3.60 0.00 0.00 0.00 0.00

Registered Parks and Gardens (ha) 23.70 0.00 11.96 0.00 0.00 72.39 7.93 3.52 0.00 89.12 0.07 50.03 0.00 0.00 0.00 7.43 0.00 9.86 0.01 0.00

Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 34.04 0.00 0.00 0.00 0.00 0.00 0.00 0.90 0.00

Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 70.68 9.50 2.32 17.49 0.00 8.80 0.00 2.70 0.00 0.00 3.79 0.00 0.00 0.10 0.00 0.00

Listed Buildings (n) 37 2 4 7 82 4 38 32 8 16 8 27 17 0 13 6 2 107 0 19

Essential Settings of Regional Planning

Guidance (ha) 0.00 0.00 0.00 0.00 50.85 0.25 36.56 42.65 0.00 45.93 0.00 54.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6.41 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00





Page 20

3.1.2 River catchments

Surface water drains into the two Main River catchments, namely:

The River Usk – at over 120km long, this river is one of the longest in Wales.

It rises in the mountains of mid-Wales then flows south-east through

Abergavenny and Usk to the village of Caerleon, down through the centre of

Newport to the strong tidal waters of the Severn Estuary12. Its catchment

predominantly drains land to the north of Newport, flowing past Caerleon and

through the centre of Newport and into the Severn estuary at Uskmouth.

The River Ebbw – this catchment drains land to the west of Newport and

flows through the western extent of Newport, meeting the River Usk adjacent

to the docklands13.

NCC is bordered by the Severn Estuary to the south, which itself forms part of the

Bristol Channel and is a tidally influenced system.

3.1.3 Internal Drainage Board

The Caldicot and Wentlooge Levels also account for much of the land to the

southeast and southwest of Newport either side of the River Usk estuary.

Figure 3 – Wentlooge (green) and Caldicot (blue) Level Drainage Districts

12 Newport City Council (November 2008) Draft River Usk Strategy. Available at:

http://www.newport.gov.uk/stellent/groups/public/documents/plans_and_strategies/cont322714.pd

f Accessed on: 12/08/15 13 Newport City Council (June 2013) Newport Local Development Plan 2011-2026: Development

and Flood Risk Background Paper. Available at:


f Accessed on: 12/08/15

http://www.newport.gov.uk/stellent/groups/public/documents/plans_and_strategies/cont322714.pdf








Page 21

Water levels in the low-lying drainage district are managed by an Internal

Drainage Board (IDB). They are the land drainage authority within their districts,

responsible for ordinary watercourses and functions include supervising land

drainage and flood defence works on ordinary watercourses. By doing this, they

closely manage water levels, both in watercourses and groundwater, by improving

and maintaining ordinary watercourses, drainage channels and pumping stations

to reduce the risk of flooding.

NRW took over the duties of the IDB in April 2015.

3.1.4 Artificial watercourses and waterbodies

There is one known artificial watercourse within NCC, the Monmouthshire and

Brecon Canal. The Council owns and maintains the two branches within the

borough, covering approximately 7 miles in total. The Crumlin arm runs from the

NCC boundary at Pontymason Lane through to High Cross and into the Malpas

area where it meets the Brecon arm. The Brecon arm flows through Malpas to the

city boundary with Torfaen. Lock regeneration works are ongoing, with NCC

partnering with the Monmouthshire, Brecon & Abergavenny Canals Trust to

promote sustainable regeneration of the canal from Five Locks, Pontnewydd to

Newport and from Newport up to Cwmcarn.

There are four significant artificial waterbodies (reservoirs) in the borough, in

addition to DCWW treated water storage reservoirs. NCC is responsible for

Gwastad Mawr Flood Storage Reservoir. DCWW is responsible for Pant-yl-oes

Reservoir on the northwest border and Ynysyfro Reservoir near Rogerstone. The

Leisure Trust are responsible for Tredegar Park Lake Reservoir.

3.2 Local flood risk in Newport

Local flood risk is defined within the FWMA as being a flood risk from:

Ordinary watercourses – all watercourses that are not designated Main River.

Surface runoff – rainfall or other precipitation which is on the surface of the

ground that has not entered a watercourse drainage system or public sewer.

Groundwater – water that has percolated into the ground and may form

underground ponds or streams, which may discharge above ground but lower

down the catchment.

The interface between Main Rivers and surface water flows.

The predominant flood risks throughout Newport are from fluvial and tidal

sources. Flooding from surface water, groundwater and ordinary watercourses is

not considered significant. More detail is given in the following sub-sections.

3.2.1 Catchment characteristics

The topography of Newport is generally low lying. Areas in the south and east of

the study area (including the Caldicot and Wentlooge Levels) tend to be flat,

along with areas along the banks of the River Usk (such as Caerleon). However,

areas around Wentwood and Llanvaches have steeper slopes.





Page 22

The geology of Newport is relatively uniform with the bedrock of the area

dominated by mudstone, siltstone and sandstones. This geology is permeable,

meaning that water can permeate the surface and enter watercourses via

underground (through flow), rather than overland methods.

The soils in the north-west of Newport are typified by loamy, clayey soils with

slightly impeded drainage. In the north-eastern extent of Newport, free draining,

slightly acid loamy soils are found. Soils in the Caldicot and Wentlooge Levels

and along the River Usk floodplain are typically loamy, clayey soils with

naturally high groundwater, associated with alluvial deposits14.

3.2.2 Groundwater

On a strategic scale in Newport, the PFRA concluded that groundwater is not

considered to be a significant flood risk.

The solid geology is blanketed by drift deposits across a significant proportion of

the study area, primarily comprising alluvial and glacial deposits. Tidal flat

despoits (a type of alluvium) are present across the southern parts of the study

area and around the River Usk, and are typically underlain by fluvio-glacial l

deposits. Glacial deposits dominate the north western parts of the study area, with

areas of alluvium present associated with watercourses. Generally for the north

east of the study area there are no superficial deposits indicated to be present, with

only areas of alluvium present associated with the watercourses.

The solid geology of the study area is relatively uniform. The Mercia Mudstone

Group is present in across the southern parts of the study area, comprising red

mudstone with bands of siltstones and sandstone. The St Maughnans Formation is

present across the northern parts of the study area, comprising interbedded

mudstone and sandstone. A small area of Blue Lias Limestone is also present in

the east of the study area.

Risk of groundwater flood associated with mining is low. Newport lies to the

south of the South Wales Coalfields and is therefore not effected by historic coal

mining. This has been confirmed by the Coal Authority online viewer15 which

indicates there are no mine entries, coal outcrops or recorded shallow mine

workings in the study area. The Review of Mining Instability in Great Britain16

indicates there are no records of metalliferous, rock, coal, iron, evaporites or chalk

mining in the study area. Groundwater flooding as a result of the escape of water

from mined voids is not anticipated in the study area

Tidal flat deposits are present across the south of the study area which are

relatively impermeable as they are cohesive in nature. The underlying fluvio-

14 Newport City Council (June 2013) Newport Local Development Plan 2011-2026: Development

and Flood Risk Background Paper. Available at:


f Accessed on: 12/08/15 15 The Coal Authority, Online interactive map viewer, database updated 14th August 2014,

accessed September 2015 http://mapapps2.bgs.ac.uk/coalauthority/home.html 16 Arup (1990) Review of Mining Instability in Great Britain for the Depart of the Environment,

Wales Region, July.



http://mapapps2.bgs.ac.uk/coalauthority/home.html





Page 23

glacial deposits are a more permeable granular material and are in hydraulic

conductively with the tidal water level. As these tidal flat deposits confines the

groundwater within the gravels, it is considered unlikely that water within the

fluvio-glacial gravels will outcrop at the group surface in the south of NCC.

3.2.3 Surface water runoff

Flooding from surface water runoff is usually caused by heavy rainfall either

when a catchment is saturated after a period of persistent rainfall or impermeable

after a prolonged dry period. Notable historic surface water flooding includes the

City Centre in 1997, Gaer Vale in 2000 and across the Borough in 2014.

Surface water flooding is often exacerbated by lack of cut-off ditches and drains,

ditches being filled in or piped, or poor maintenance of ditches and watercourses

by riparian owners. Damage to stream and other drains may also be caused by

developers or livestock. Land management practices such as removal of top soil

and removal of vegetation may also increase the surface runoff from the

catchment.

Runoff will be altered if an area is subject to a new development such as housing.

Although the total runoff is likely to increase, planning policy requires controls to

be imposed to restrict the maximum rate of runoff from these developments to

typically a level no greater than greenfield runoff or existing discharge rates

where appropriate.

3.2.4 Highway drainage

Flooding from highway drainage usually occurs due to short, very high intensity

storms. Flooding is often caused or exacerbated by highway gullies becoming

blocked by debris. NCC manage this risk by maintaining gullies (Section 4.1.1)

Pollution from highway drainage can arise from a variety of sources: these include

accidents, general vehicle and road degradation, incomplete fuel combustion,

small oil or fuel leaks and atmospheric deposition. Acute pollution occurs as a

result of severe, usually transient, impact. A prolonged dry weather period enables

a cumulative build-up of contamination on the carriageway. Intense rainfall

following these conditions can lead to the highest concentrations of pollutants.

3.2.5 Ordinary watercourses

At a community-scale, the area is drained through numerous ordinary

watercourses. An ordinary watercourse is defined as a watercourse that does not

form part of a Main River. This includes streams, drains, culverts, dikes, ditches

and passages through which water flows. Known features are recorded by NCC

and others are likely to be found as investigations continue.

Flooding may be caused by inadequate maintenance, which is normally the

responsibility of the riparian owners. Capacities of pipes are often significantly

reduced by the build-up of silt and debris within the culverts. Flooding may also

occur as a result of culvert failure. There are 345 culverts for which NCC are

responsible for the maintenance of and a further 304 highway culverts. NCC





Page 24

inspect culverts where there is evidence that capacity has been adversely affected

(see Section 4.1.1).

The surface water from the watercourses enters the drainage system through a

large number of intakes, some with debris screen grids and some without.

Flooding may occur when a culvert inlet or grid becomes blocked. NCC manage

this risk by cleaning and maintaining inlets (see Section 4.1.1)

There are approximately 87 debris gratings which NCC are responsible for. Ten

inlets have been identified as critical due to the high risk of property or high speed

road flooding should they become blocked:

Ringland Circle, Ringland

Llanwern Village

Tredegar Reen, Duffryn

Ogmore Crescent, Bettws

Nant Coch, Western Avenue

Forge Lane, Rogerstone

Gaer Pond

St Cadocs Close, Caerleon

A48 Langstone

A48 Penhow

There are 18 storm water pumping stations maintained by NCC. Typically they

are served by a dual pump arrangement providing some back-up. All are

understood to be powered by mains electricity with no on-site back-up generation.

Old Green South and Old Green North become tide-locked, restricting discharges.

The following are considered high-risk and have telemetry installed:

Malpas, M4 Roundabout

Docks Way, Maesglas

Old Green South

Illegal connections to existing culverts and the culverting of watercourses without

consent, also present a potential source of flooding and pollution. Where illegal

works are identified, NCC can utilise its powers as LLFA to remedy the situation.

3.2.6 Sewer flood risk

The sewer network in Newport mostly comprises combined sewers that take both

foul sewage and surface water. Flows are usually controlled through combined

sewer overflows (CSOs), which allow excess dilute flows to discharge into natural

drainage channels to protect properties from sewer flooding but adversely

affecting the quality of receiving watercourses. NRW is responsible for licencing

and monitoring all CSOs.

DCWW is the statutory water undertaker and is responsible for the public sewer

systems within the Borough. DCWW maintains a register of historical property

sewer flooding events which shows that there are localised sewer flooding issues

within the borough. NCC operate and maintain 11 wastewater pumping stations

which are to be transferred to DCWW ownership in 2016.

Sewer flooding occurs when sewers are overwhelmed by heavy rainfall or when

they become blocked. The chance of flooding depends on the capacity of the local

sewerage system. Anonymised records of sewer flooding incidents from DCWW

within Newport (dated 28th May 2015) indicate properties have flooded internally





Page 25

and externally in the past due to hydraulic overload. Some external locations may

be areas such as sections of highway, fields, car parks etc.

In addition, data provided by the Integrated Surface Water Management Group

indicates several small sewer flooding hotspots. However, the PFRA concluded

flooding from sewers does not have significant consequences at a strategic scale.

3.2.7 Flood risk from Artificial Sources

There are four significant artificial waterbodies (reservoirs) within their authority

boundary, however, there are no records of flooding from these waterbodies. NCC

own and maintain the two branches of the Monmouthshire and Brecon Canal.

There are no records of flooding from the canal within the borough.

3.2.8 Interaction with Main Rivers and the Sea

There are significant areas within Newport which are subject to river flooding.

River flooding remains within the remit of NRW and is covered in the Severn

River Basin Flood Risk Management Plan. Figures for river flooding have not

been included in this report as it could result in double counting.

The PFRA concluded that there was insufficient data available to draw definitive

conclusions. Anecdotal evidence suggests that surface water flooding is

exacerbated when high rainfall events occur during high tidal cycles as gravity

drains and the outfalls are restricted by high tidal waters. Typically, these issues

occur on and around the Caldicot Levels where the consequences are not deemed

significant. Interactions with Main Rivers may also be identified within central

Newport where surface water systems discharge into the River Usk in areas such

as Crindau, the City Centre, Victoria and Reevesland. The formal and anecdotal

data provided indicates that such interaction does not cause flooding with

significant harmful consequences. In some locations drainage infrastructure, such

as surface water pumping stations, mitigates this risk.

3.3 Approach to high-level costing of measures

High-level costing of measures has been completed using the Environment

Agency’s long term costing tool for flood and coastal risk management17 where

sufficient information is available, or an indicative cost range has been estimated

on the basis of similar types of schemes. No site walkovers, investigation or

design has been completed as part of this desk-based study. Information including

site-specific investigation, design and procurement-forms will be required to

develop the costing of measures prior to business case justification and

subsequent delivery.

17 Long term costing tool for flood and coastal risk management. Available at:

https://www.gov.uk/government/publications/long-term-costing-tool-for-flood-and-coastal-risk-

management Accessed on 26/8/15

https://www.gov.uk/government/publications/long-term-costing-tool-for-flood-and-coastal-risk-management

https://www.gov.uk/government/publications/long-term-costing-tool-for-flood-and-coastal-risk-management





Page 26

4 How Newport City Council currently

manages flood risk

NCC manage flood risk arising from surface water, groundwater and ordinary

watercourses through:

1. Operational procedures, developed over years through good practice;

2. Measures included in the LFRMS;

3. Powers given to all LLFA through the FWMA 2010 and the Land Drainage

Acts 1991 and 1994;

4. As NCC is also the Highways Authority for the area, powers under the

Highway Act 1980.

5. As NCC is also the Local Planning Authority, powers under the Planning

(Wales) Act 2015.

4.1.1 Operational procedures

The main operational procedures used to manage flood risk in NCC are listed

below:

1. Routine inspection and cleansing of highway drains (also called ‘surface

water gullies’). All gullies are cleansed once a year on a routine programme.

Any defects identified such as broken covers or stubborn blockages are

identified and works orders raised to repair.

2. Reactive inspection and cleansing of blocked gullies which have been

notified to NCC Highways by the public. If deemed necessary they are

cleaned on a weekly reactive cleansing schedule.

3. Reactive inspection and repair of culverts. Given the level of resource to

effectively inspect all culverts; inspections are restricted to systems where

there is evidence that the capacity has been adversely affected.

4. Routine inspection, cleansing and maintenance of all intake grids to culverts

on a continuous rota throughout the year. There is no telemetry on grids.

5. Reactive inspection and clearance of ‘critical’ grids preceding and following

forecast heavy rainfall and/or a Flood Watch has been issued by NRW.

6. Emergency cleansing of blocked grids which have been notified to NCC

Drainage by members of the public.

7. Reactive maintenance of NCC surface water outfalls.

8. Routine maintenance of NCC surface water pumping stations and on a

reactive basis when a problem becomes apparent.

9. Liaison with the riparian owner to ensure they are fulfilling their

responsibilities.





Page 27

10. Supporting the LPA determination of applications for development to

ensure that surface water run-off is to be controlled as near to the source as

possible by the use of sustainable drainage systems18.

4.1.2 Measures contained within the Local Flood Risk

Management Strategy

Measures by NCC to manage and reduce flood risk contained within the LFRMS

are summarised in Table 4.

18 Planning Policy Wales – Development Management and Flood Risk. Available at:

http://gov.wales/docs/desh/publications/140731planning-policy-wales-edition-7-en.pdf Accessed

17/08/15.

http://gov.wales/docs/desh/publications/140731planning-policy-wales-edition-7-en.pdf





Page 28

Table 4 - NCC Local Flood Risk Management Strategy Measures

Short Term (0-20 years) and Short, medium and long term (0-100 years)

National Objectives NCC LFRMS’s Measures

Reducing the consequences for individuals, communities,

businesses and the environment from flooding and coastal erosion

In partnership with other RMAs will lead the management of local flood risk and coastal erosion risk.

Identify areas of significant local flood risk and prepare FRMP, using Flood Hazard maps and historical flood data. Identify areas at high risk of coastal erosion using Welsh Government maps, and

prepare appropriate management plans.

Ensure that the Local Development Plan adequately addresses flood and coastal erosion risks including climate change. Prepare the Strategic Flood Consequence Assessment to form part of LDP

evidence base to help NCC make informed decisions so that, wherever possible, new development is directed away from areas at high risk of flooding, unless the Development Advice Maps are

demonstrated to be incorrect and there are acceptable mitigation measures.

Where required and funding is available, undertake catchment-based studies with a view to identifying flood risk and design new mitigation measures.

Provide, whenever possible and in conjunction with the RMAs, advice to supportive landowners on sustainable land management.

Establish, and regularly update, a register of all flood risk assets that are likely to significantly influence local flood risk and coastal erosion.

Use forthcoming Welsh Government National Standards for Sustainable Drainage (SuDS) and accompanying guidance, when/if Schedule 3 of the FWMA places a duty on NCC to undertake the

role of SuDS Approval Body (SAB).

Annually monitor the strategy and review the strategy every 6 years.

Raising awareness of and engaging people in the response to flood

and coastal erosion risk

In conjunction with the RMAs:

Liaise with local communities and businesses to raise awareness on flood and coastal erosion risks.

Raise awareness of property level protection19.

Encourage participation from willing local communities and businesses in managing local flood risk.

Make appropriate provisions to enable local communities and businesses to find information associated with flood and coastal erosion risks. This will include guidance on how to report a flood

incident, important contact details and guidance on preparing flood plans.

Form partnerships with relevant stakeholders to manage local flood risk.

Providing an effective and sustained response to flood and coastal

erosion events

In conjunction with the Gwent Local Resilience Forum (LRF) and the RMAs as appropriate:

Prepare emergency response plans to deal with flood risk arising from local sources.

Assist local communities, businesses and individuals with the preparation of emergency plans.

Continue to undertake exercises to test the implementation of their emergency plans, and their response and recovery mechanism to flooding incidents.

Where necessary, endeavour to undertake investigations into flood incidents within four weeks.

Prioritising investment in the most at risk communities Identify communities most risk of flooding from local sources or from coastal erosion, consider the cost and benefits to manage or reduce the risk, and prepare and implement prioritised projects.

Annually review current maintenance regime and consider targeted maintenance changes to manage or reduce local flood and coastal erosion risk.

19 What is Property Level Protection? Available from http://www.nationalfloodforum.org.uk/what-is-plp/ Accessed 17/08/15.

http://www.nationalfloodforum.org.uk/what-is-plp/





Page 29

4.1.3 Additional duties under the Flood and Water

Management Act 2010

Under the FWMA, LLFAs such as NCC have been given additional duties which

directly impact on flood risk management. These include:

1. A duty to investigate all flooding within its area, in so far as a LLFA

consider it necessary or appropriate;

2. A duty to maintain an asset register of structures and features likely to affect

flood risk;

3. A duty to contribute to sustainable developments; and

4. Consenting on Ordinary Watercourses (Section 29 of Schedule 2).

4.2 How Newport City Council prioritises their work

The National Strategy sets a range of factors which should be considered in

determining the type of risk management intervention, scale of investment and

share met by Government. This largely considers the impact on receptors at-risk,

influenced by the scale, duration, and onset of flooding:

Risk to life;

Longer term sustainability of the community, the approach taken and the

wider environment;

Economic impacts, costs and benefits;

Impacts of flooding on the operational capacity of critical infrastructure;

Social impacts, costs and benefits;

Frequency of flooding;

Environmental costs and benefits derived from the work;

Availability of appropriate compensation sites where work impacts designated

habitats;

Impacts on wider cultural heritage; and

Multiple benefits in relation to human health and wellbeing.

Risk to life is regarded as the most significant factor in determining priority of

investment. Welsh Government recently consulted on the way it allocates

funding20. They intend to create a clear, objective way of directing funds to places

at risk from all sources of flooding and coastal erosion.

In order to satisfy the requirements of the National Flood and Coastal Erosion

Risk Management Strategy, NCC’s FLRMS has thirteen detailed objectives

implemented by twenty-one prioritised measures.

Frequency of flooding is considered in terms of the annual probability of flooding.

This is a measure of the chance of flooding over the course of any given year.

20 Flood and Coast Investment Programme (FaCIP) Consultation. Available at:

http://gov.wales/consultations/environmentandcountryside/flood-and-coast-investment-

programme-facip/?lang=en Accessed 11/08/15.

http://gov.wales/consultations/environmentandcountryside/flood-and-coast-investment-programme-facip/?lang=en






Page 30

4.3 Who Newport City Council works with to

manage flood risk

4.3.1 Risk management authorities

NCC works closely with other RMAs to endeavour to bring to the community a

joined-up approach to all sources of flooding, no matter which organisation has

the legal duty. An example of such partnership working is the joint partnership

between the then Environment Agency (now NRW) and NCC response to Malpas

Brook flooding 130 properties and the Usk flooding an additional 9 properties in

2000, and the subsequent Goodrich Crescent scheme delivery.

A list of the primary organisations NCC works with to manage flood risk is

provided in Table 5. All these organisations will be consulted as part of

preparation of this FRMP. The roles and responsibilities of RMAs are provided in

detail by the Welsh Government’s National Strategy for Flood and Coastal

Erosion Risk Management.

Table 5 - Table outlining the primary roles of RMAs operating within Newport.

Organisation Area covered Summary of primary roles in respect of local

sources of flood risk

Primary Risk Management Authorities

Natural Resources

Wales

Including the former:

Environment

Agency

Forestry

Commission

Wales

Countryside

Council for

Wales

Caldicot and

Wentlooge

Levels Internal

Drainage Board

Wales Oversight responsibilities in relation to all flood

and coastal erosion risk management in Wales,

including flood risk arising from local sources.

NRW leads on the provision of technical advice and

support to the other RMAs. They also lead on

national initiatives such as Flood Awareness Wales

and is the single point of contact for enquiries and

information on flood risk.

In relation to responsibility for land drainage in the

Gwent levels, an area of special drainage need:

A duty to comply with the National Strategy

and the relevant Local Strategy;

Co-operation with other authorities, including

sharing data; and

A duty to contribute to sustainable

development.

Dŵr Cymru Welsh

Water

Supplies

drinking water

and sewerage to

most of Wales

and parts of

western England

To act consistently with the National Strategy;

To have regard to the content of the relevant

Local Strategy; and

To co-operate with other RMAs including

sharing data.

Newport City Council Newport NCC has been established as a LLFA for its

administrative area. NCC is also the highway

authority for the area having responsibility for

managing all adopted highways which are not

included within the remit of SWTRA. NCC also is

the local planning authority and the Civil

Contingencies Unit.





Page 31

Other key partners include:

Neighbouring LLFAs – Caerphilly County Borough, Cardiff City,

Monmouthshire County and Torfaen County Borough Councils.

The borough’s 12 community councils21

Flood Risk Management Wales Committee22

Emergency Services – South Wales Fire and Rescue, Welsh Ambulance

Service, Aneurin Bevan University Health Board and Gwent Police

National Flood Forum

Network Rail

Local Resilience Forum (LRF)

South Wales Trunk Road Agency (SWTRA)

Cadw

4.3.2 Riparian landowners

Those who own land adjoining, above or with a watercourse running through it,

are ‘riparian landowners’ and are key to efforts to manage flood risk from

ordinary watercourses. NRW provide useful guidance on riparian landowner

responsibilities23 which include:

maintaining river beds and banks

allowing the flow of water to pass without obstruction

controlling invasive species such as Japanese knotweed

Riparian landowner also have a responsibility to manage their own flood risk.

4.4 How this FRMP has been coordinated

Co-ordination and development of this FRMP has been achieved through regular

meetings of the various groups as listed below:

1. South and East Wales Flood Risk Management Group attended by all LLFA

in South Wales, NRW, Welsh Local Government Association and DCWW;

2. FRMP Working Group attended by all LLFAs in South East Wales, Welsh

Government, NRW and Welsh Local Government Association;

3. Internal collaboration has been achieved through regular meetings of the

Flood Risk Management Team; and

4. Sharing of work programmes with NRW and DCWW.

21 Newport Community Councils. Available at:

http://www.newport.gov.uk/_dc/index.cfm?fuseaction=political.communitycouncils. Accessed on

11/08/15. 22 Flood Risk Management Wales Committee. Available at: http://naturalresources.wales/about-

us/our-chair-and-board/our-board-committees/flood-risk-management-wales-committee-

frmw/?lang=en. Accessed 11/08/15. 23 A guide to your rights and responsibilities of riverside ownership in Wales. Available at:

https://naturalresources.wales/flooding/managing-flood-risk/riverside-property-owners-know-

your-rights-and-responsibilities/?lang=en Accessed on 05/10/15.

http://www.newport.gov.uk/_dc/index.cfm?fuseaction=political.communitycouncils

http://naturalresources.wales/about-us/our-chair-and-board/our-board-committees/flood-risk-management-wales-committee-frmw/?lang=en



https://naturalresources.wales/flooding/managing-flood-risk/riverside-property-owners-know-your-rights-and-responsibilities/?lang=en

https://naturalresources.wales/flooding/managing-flood-risk/riverside-property-owners-know-your-rights-and-responsibilities/?lang=en





Page 32

4.5 Measures already underway to manage flood risk

Details of the measures and operational procedures already underway in Newport

have been listed in Section 4.1.1. The Floods Directive places a requirement that

the measures should address the four categories of Prevention, Protection,

Preparedness, and Recovery and Review. Details for each category are below. A

count of the number of measures within each category has been included by ward.

Table 6 – Definitions of measures, used for reporting within the Floods Directive.

Reporting

Code

Prevention

Type Measure Description

M21 Avoidance Measure to prevent the location of new or additional receptors in

flood prone areas, such as land use planning policies or

regulation.

M22 Removal or

Relocation

Measure to remove receptors from flood prone areas, or to

relocate receptors to areas of lower risk.

M23 Reduction Measures to adapt receptors to reduce the adverse consequences

in the event of a flood action on buildings, public networks, etc.

M24

Other

Prevention

Other measures to enhance flood risk prevention (may include,

flood risk modelling and assessment, flood vulnerability

assessment, maintenance programmes, or policies etc.)

Issue Flood Defence Consents, comment on Flood Consequence

Assessments, update and improve the accuracy of flood risk

mapping, and understand the local flood risk better.

Reporting

Code

Protection


M31 Natural Flood

Management/

Run Off and

Catchment

Management

Measures to reduce the flow into natural or artificial drainage

systems, such as overland flow interceptors and or storage,

enhancement of infiltration etc. and including in-channel,

floodplain works and the reforestation of banks, that restore

natural systems to help slow flow and store water.

M32 Water Flow

Regulations

Measures involving physical intervention to regulate flows,

such as construction modification or removal of water retaining

structures (e.g. dams or other on-line storage areas or

development of existing flow regulation rules), and which have

significant impact on the hydrological regime.

M33 Channel,

Coastal and

Floodplain

Works

Measures involving physical interventions to freshwater

channels, mountain streams estuaries coastal waters and flood

prone areas of land, such as construction, modification or

removal of structures or the alteration of channels, sediment

dynamics management, dykes etc.

M34 Surface Water

Management

Measures involving physical interventions to reduce surface

water flooding, typically, but not exclusively, in an urban

environment, such as enhancing artificial drainage capacity or

through sustainable drainage systems (SuDS).

M35

Other

Protection

Other measures to enhance protection against flooding,

including flood asset maintenance programmes, or policies.

On-going maintenance programme.





Page 33

Reporting

Code

Preparedness


M41 Flood

Forecasting

and Warning

Measures to establish or enhance a flood forecasting or warning

system.

M42 Emergency

Event

Measures to establish or enhance flood event institutional

emergency response planning.

M43 Public

Awareness

and

Preparedness

Measures to establish the public awareness or preparedness for

flood events.

Flood awareness programme.

M44 Other

Preparedness

Other measures to establish or enhance preparedness for flood

events to reduce adverse consequences.

Report

Code

Recovery and Review


M51 Individual and

Societal

Recovery

Clean up and restoration activities (buildings, infrastructure, etc.).

Health and mental health supporting actions, including managing

stress. Disaster financial assistance (grants, tax) including disaster

unemployment assistance, temporary or permanent relocation or

other.

M52 Environmental

Recovery

Clean up and restoration activities (with several sub topics as

mould protection, well-water safety and securing hazardous

material containers).

M53 Other Recovery

and Review

Lessons learnt from flood events, insurance policies.

Each measure listed in the Flood Risk Management Strategy and used in this

report has been placed into one of these categories as noted within each measure.





Page 34

5 Coordination with the Severn River Basin

Management Plans

NCC lies within the catchment for the River Severn RBMP. The updated draft

Severn RBMP was published24 by the Environment Agency and NRW. NCC

reviewed the consultation draft and no matters were raised in response.

Flood risk management is one of many reasons why waterbodies fail to meet the

WFD objectives. Where action is needed to manage the risk of flooding, it should

not lead to further deterioration of the water environment but instead seeks

opportunities for improvement and delivers joint benefits.

The draft Severn River Basin Flood Risk Management Plan (RBFRMP) was

published25 by the Environment Agency and NRW.

Figure 4 - 2009 River Basin Management Plan ecological river waterbody quality status26

- note estuarine River Usk is moderate.

24 River basin management plan for the Severn River basin district. Available at:

https://consult.environment-

agency.gov.uk/portal/ho/wfd/draft_plans/consult?pointId=s1405417965041#section-

s1405417965041. Accessed 17/08/15 25 Draft Severn River Basin District Consultation on the draft Flood Risk Management Plan.

Available at: http://naturalresources.wales/about-us/consultations/our-own-consultations-

closed/consultation-on-draft-flood-risk-management-plans-for-wales/?lang=en. Accessed

17/08/15. 26 Available at: http://maps.environment-

agency.gov.uk/wiyby/wiybyController?topic=wfd_rivers&layerGroups=default&lang=_e&ep=ma

p&scale=6&x=331382&y=188071 Accessed 05/10/15.

https://consult.environment-agency.gov.uk/portal/ho/wfd/draft_plans/consult?pointId=s1405417965041#section-s1405417965041



http://naturalresources.wales/about-us/consultations/our-own-consultations-closed/consultation-on-draft-flood-risk-management-plans-for-wales/?lang=en

http://naturalresources.wales/about-us/consultations/our-own-consultations-closed/consultation-on-draft-flood-risk-management-plans-for-wales/?lang=en

http://maps.environment-agency.gov.uk/wiyby/wiybyController?topic=wfd_rivers&layerGroups=default&lang=_e&ep=map&scale=6&x=331382&y=188071







Page 35

Figure 5 - 2009 River Basin Management Plan ecological river waterbody quality

status27- note estuarine River Usk is good.

In selecting the measures in the FRMP we have considered what is proposed in

the other plans to ensure that all are complimentary. This is shown in Table 7.

Where there is an obvious opportunity to deliver against the Water Framework

Directive and the Flood Regulations, we have endeavoured to include it.

27 Available at: http://maps.environment-

agency.gov.uk/wiyby/wiybyController?topic=wfd_rivers&layerGroups=default&lang=_e&ep=ma

p&scale=6&x=331382&y=188071 Accessed 05/10/15.








Page 36

Table 7 – Mapping interdependencies between Management Plan measures.

Measure Category NCC LFRMS Measure Severn FRMP Measure Severn RBMP Measure

Prevention NCC in partnership with other RMAs will lead the management of flood risk arising from local

sources, and coastal erosion risk within Newport

Working with others to avoid inappropriate development to the floodplain

Ensuring appropriate floodplain compensation to mitigate for development

Supporting the implementation of sustainable urban drainage systems

Advising how new development can be more resilient to flooding

Ensuring a robust maintenance programme

Table 9, Measure 2: Removal or modification of engineering

structure

Table 9, Measure 3: Improvement to condition of channel/bed

and/or banks/shoreline

Table 9, Measure 5: Changes to operation and maintenance

Table 9, Measure 6: Vegetation management

Table 9, Measure 7: Dredging and silt management

Table 12, Measure 3: Improvement to condition of

channel/bed and/or banks/shoreline

Prevention NCC will use EA flood hazard maps to identify areas of significant local flood risk,

supplemented with historical data. Flood Risk Management Strategy and plans will be

prepared on this information.

Undertaking mapping and modelling to ensure flood risk information remains up to

date and fit for purpose


Prevention NCC will undertake catchment based studies with a view to identifying flood risk and design

new mitigation measures.

Identifying opportunities for floodplain restoration

Ensuring appropriate flood plain compensation to mitigate for development

Table 9, Measure 2: Removal or modification of engineering

structure


Protection NCC, with the RMAs, will provide advice to supportive landowners on sustainable land use

management aiming at improving the risk of flooding.

Increasing awareness and encouraging landowners to fulfil their riparian landowner

responsibilities

Encouraging best farming practices to reduce rapid surface water run-off and soil

erosion


Table 14, Measure 3: Sustainable woodland and forestry

management

Preparedness NCC will establish, and regularly update, a register of all flood risk assets that are likely to

influence local flood risk and coastal erosion.

Reviewing Asset System Management Plans

Delivering emergency works where needed for flood risk management assets.


Protection NCC will adopt the Welsh Government guidance to implementing Sustainable Drainage

Systems and to execute its role as a SuDS Approval Body, subject to the implementation of

this legislation.

Supporting the implementation of sustainable urban drainage systems Table 9, Measure 4: Improvement to condition of riparian

zone and/or wetland habitats


Table 14, Measure 3: Sustainable woodland and forestry

management

Recovery and

Review

NCC will annually monitor the strategy and will review the strategy every 6 years. Improve and develop service based on lessons identified following flood events.

Preparedness NCC, with the RMAs, will liaise with local communities and businesses to raise awareness on

flood and coastal erosion risks.

Working with others to avoid inappropriate development in the floodplain.

Promoting flood resilience and flood proofing

Providing advice and information to local communities to enable them to reduce the

impact of flooding

Preparedness NCC, with the RMAs, will raise awareness on the implementation of property level flood

resilience measures.

Advising how new development can be more resilient to flooding


impact of flooding

Preparedness NCC, with the RMAs, will make appropriate provisions to enable local communities and

businesses to find information associated with flood and coastal erosion risks. This will include

guidance on how to report a flood incident, contact details, and guidance on preparing flood

plans.


impact of flooding

Maintaining and improving the flood forecasting, flood warning and flood incident

management service

Providing flood incident response service 24 hours a day

Preparedness NCC, in conjunction with the Gwent LRF, is preparing emergency response plans to deal with

flood risk arising from local sources.


management service

Table 9, Measure 10: First cycle investigations

Preparedness NCC, in conjunction with the LRF, and the RMAs, will assist local communities, businesses

and individuals with the preparation of emergency plans.


management service






Page 37

Measure Category NCC LFRMS Measure Severn FRMP Measure Severn RBMP Measure

Recovery and

Review

Where necessary, NCC will endeavour to undertake investigations into flood incidents within

four weeks.

Ensuring a robust maintenance programme


management service

Providing flood incident response service 24 hours a day

Improve and develop services based on lessons identified following flood events


Protection NCC will identify communities that are most at risk of flooding from local sources or from

coastal erosion, consider the cost and benefits of identified schemes that manage or reduce the

risk of flooding from these sources, and prepare and implement a prioritisation system specific

projects. NCC will also prepare a business case for securing funding for these projects.

Undertake initial assessment and feasibility work for reducing flood risk Table 9, Measure 10: First cycle investigations

Protection NCC will annually review their current maintenance regime and consider targeted maintenance

changes to manage or reduce local flood and coastal erosion risk.

Improve and develop services based on lessons identified following flood events Table 9, Measure 5: Changes to operation and maintenance





Page 38

6 Newport Flood Risk Management Plan

objectives

Welsh Government’s National Strategy for managing flooding and coastal erosion

risk has set four overarching objectives:

reducing the consequences for individuals, communities, businesses and the

environment from flooding and coastal erosion;

raising awareness of and engaging people in the response to flood and coastal

erosion risk;

providing an effective and sustained response to flood and coastal erosion

events; and

prioritising investment in the most at risk communities.

Following the production of the National strategy NCC published its LFRMS that

takes forward the national strategies objectives. The 4 overreaching objectives

from the national plan take into account the social, economic and environmental

risks associated with flooding. To be consistent with the Flood Risk Regulations

requirements, NCC’s LFRMS objectives focus around the reduction of potential

adverse consequences of flooding for human health, the environment, cultural

heritage, economic activity and if considered appropriate on local community

facilities.

NCC set objectives for Newport’s LFRMS by translating the four overarching

objectives of the National Strategy into objectives specific to Newport. These

objectives are aimed at reducing the consequences of flood risk arising from local

sources and coastal erosion risk, and address the short term (0-20 years), the

medium term (20-50 years) and the long term (50-100 years) outcomes of the

strategy. This ensures that the objectives are also consistent with the requirements

of the Regulations. The objectives are summarised in the Table below.





Page 39

Table 8 - Objectives of the National FRM Strategy and the NCC LFRMS

Overarching objectives of the National Strategy Objectives of NCC’s LFRMS Social Economic Environmental

Reducing the consequences for individuals, communities,

businesses and the environment from flooding and coastal

erosion.

Provide strategic leadership for assessment and management of flood risk arising

from local sources and coastal erosion

Reduce number of people exposed to flooding

Reduce risk to life (flooding of significant depth and velocity)

Reduce the number of residential and commercial properties affected by the risk

of flooding

Reduce disruption to essential services and critical infrastructure

Minimise damage to environmentally sensitive sites

Develop effective land use and land management policies, and development

management procedures

Prepare an asset maintenance and management plan

Raising awareness of and engaging people in the response

to flood and coastal erosion risk.

Ensure that those living in areas susceptible to local flood and coastal erosion

risks are aware of it and understand what actions they can take to improve their

protection

Ensure that NCC works in partnership with all Management Authorities and

works collaboratively with adjacent Authorities for successful implementation of

the strategy

Providing an effective and sustained response to flood and

coastal erosion events.

Prepare emergency response plans and test their implementation

Respond to flood incidents and implement subsequent recovery measures in a

timely manner

Prioritising investment in the most at risk communities. Prepare a programme of investment for flood and coastal erosion risk

management based on a cost benefit analysis for communities at risk





Page 40

7 How Newport City Council will manage

flood risk at a local level

Local flood risk will be managed on a ward boundary scale. This provides a

suitable level of granularity whilst directly linking into NCC governance

structures.

Measures have been identified and informed by:

Records of known historic local flooding incidents (see Appendix 1) were

provided by NCC on 31st July 2015, supplementing records in NCC’s PFRA.

South Wales Fire and Rescue recorded attendance at incidents classed as

‘flooding’ between June 2009 and June 2015. Minor flooding and non-surface

water flooding such as pipe bursts or sewer flooding was screened out where

information was available.

NCC asset informations supplemented by workshops held in September 2015

with NCC drainage engineering and operational staff to capture known

operational, maintenance and safety issues.

Flood risk analysis of surface water mapping.

7.1 Overview of local flood risk

The following tables and plans provide an initial overview of surface water flood

risk within the borough. Less densely populated wards have less property at risk

but otherwise the predicted risk is relatively spread across the borough.

The predominant flood risk throughout much of Newport is from the Rivers Usk

and Ebbw, and tidal flooding from the Severn Estuary. Flood risk from surface

water and ordinary watercourses is localised, exacerbated by blockages and/or

high tides restricting drainage.

The wards with the greatest proportion of residential properties at predicted risk of

surface water flooding are ranked below. The wards with a greater proportion of

properties at high predicted risk of surface water flooding include those with

steeper topography or adjoining the levels. The densely populated flatter, tidal

flood risk dominated wards have the greatest proportion of properties at low

predicted risk of surface water flooding.

Table 9 – Top five ranked wards, by proportion of properties at predicted flood risk

(depth>0.2m)

Rank High (>1 in 30

chance in any year)

Medium (1 in 30 to 1 in 100

chance in any year)

Low (1 in 100 to 1 in 1000

chance in any year)

1 Bettws Alway Victoria

2 Alway Bettws Pillgwenlly

3 Ringland St. Julians St. Julians

4 Allt-yr-Yn Beechwood Bettws

5 Graig Ringland Alway





Page 41

Table 10 – Summary of the predicted risk from surface water to a range of receptors.

High

(>1 in 30

chance in any

year)

Medium

(1 in 30 to 1 in 100

chance in any

year)

Low

(1 in 100 to 1 in

1000 chance in any

year)

Residents in areas at risk of flooding

(depth >0.0m) 734 2,251 15,288

Residential properties at risk of

internal flooding (depth >0.2m) 186 552 4,002

Essential Services (n) 7 10 52

Non-Residential Properties (n) 85 233 853

Primary/Trunk Roads (km) 37.7 88.8 267.3

Main Line Railways (km) 1.95 3.84 8.59

Agricultural Land - Grades 1, 2 and

3 (ha) 77 143 504

Special Areas of Conservation

(SAC) (ha) 0 0.05 0.35

Special Protection Areas (SPA) (ha) 0 0.03 0.19

Ramsar Sites (ha) 0 0.03 0.19

Sites of Special Scientific Interest

(SSSI) (ha) 13.19 34.91 217.74

Sites of Interest for Nature

Conservation (SINC) 45.35 70.32 129.41

National Nature Reserves (NNR)

(ha) 0 0.01 3.3

Local Nature Reserves (LNR) (ha) 0.44 0.56 0.87

Ancient Woodland (ha) 4.96 8.27 19.17

Registered Parks and Gardens (ha) 8.08 11.49 27.09

Country Parks (ha) 0.17 0.56 4.19

Scheduled Ancient Monuments

(SAM) (ha) 0.93 2.01 6.75

Listed Buildings (n) 12 18 36

Essential Settings of Regional

Planning Guidance (ha) 7.11 12.02 26.03

There are few instances of groundwater flooding in Newport.





Page 42

Table 11 - Estimated residents in areas at risk of flooding depth >0.0m

Ward

High

(>1 in 30

chance in any year)

Medium

(1 in 30 to 1 in 100

chance in any year)

Low

(1 in 100 to 1 in 1000

chance in any year)

Allt-yr-Yn 51 144 473

Alway 107 304 909

Beechwood 32 186 724

Bettws 181 311 1148

Caerleon 19 84 654

Gaer 9 51 459

Graig 53 102 371

Langstone 23 58 258

Liswerry 0 14 833

Llanwern 7 30 211

Malpas 12 46 295

Marshfield 12 16 135

Pillgwenlly 9 114 1206

Ringland 70 202 872

Rogerstone 16 118 810

Shaftesbury 26 88 677

St. Julians 58 181 1179

Stow Hill 28 121 422

Tredegar Park 0 0 724

Victoria 21 81 2928





Page 43

Table 12 - Residential Properties at risk of internal flooding depth >0.2m

Ward

High

(>1 in 30

chance in any year)

Medium

(1 in 30 to 1 in 100

chance in any year)

Low

(1 in 100 to 1 in 1000

chance in any year)

Allt-yr-Yn 19 0.5% 42 1.1% 100 2.6%

Alway 33 1.0% 102 3.1% 268 8.0%

Beechwood 4 0.1% 46 1.4% 205 6.0%

Bettws 43 1.3% 77 2.3% 312 9.3%

Caerleon 4 0.1% 11 0.3% 91 2.6%

Gaer 0 0.0% 7 0.2% 98 2.5%

Graig 12 0.5% 21 0.8% 66 2.7%

Langstone 6 0.3% 9 0.5% 38 2.2%

Liswerry 0 0.0% 0 0.0% 196 3.8%

Llanwern 3 0.2% 8 0.6% 24 1.9%

Malpas 3 0.1% 9 0.3% 44 1.3%

Marshfield 4 0.2% 5 0.2% 32 1.3%

Pillgwenlly 4 0.1% 20 0.6% 355 11.3%

Ringland 20 0.5% 43 1.1% 182 4.8%

Rogerstone 5 0.1% 18 0.4% 131 3.0%

Shaftesbury 7 0.3% 22 0.9% 196 8.0%

St. Julians 11 0.3% 62 1.6% 357 9.4%

Stow Hill 6 0.2% 27 1.1% 84 3.5%

Tredegar Park 0 0.0% 0 0.0% 148 7.7%

Victoria 2 0.1% 23 0.7% 1075 34.3%





Page 44





Page 45





Page 46





Page 47





Page 48

Table 13 – Total features at high risk of surface water flooding (greater than a 1 in 30 chance of flooding in any year)

All

t-y

r-Y

n

Alw

ay

Bee

chw

oo

d

Bet

tws

Cae

rleo

n

Gae

r

Gra

ig

Lan

gst

on

e

Lis

wer

ry

Lla

nw

ern

Mal

pas

Mar

shfi

eld

Pil

lgw

enll

y

Rin

gla

nd

Ro

ger

sto

ne

Sh

afte

sbu

ry

St.

Ju

lian

s

Sto

w H

ill

Tre

deg

ar

Par

k

Vic

tori

a

Residential Properties (n) flooding depth >0.2m 19 33 4 43 4 0 12 6 0 3 3 4 4 20 5 7 11 6 0 2





Agricultural Land - Grades 1, 2 and 3 (ha) 0 0 0 4 2 0 18 10 0 5 0 26 0 1 11 0 0 0 0 0



Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Sites of Special Scientific Interest (SSSI) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.74 0.00 3.62 0.00 8.82 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00

Sites of Interest for Nature Conservation (SINC) 1.43 0.12 0.00 13.53 6.22 3.15 5.85 1.51 0.00 2.12 0.68 0.24 0.02 1.06 8.03 0.27 0.03 0.00 1.09 0.00





Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00



Essential Settings of Regional Planning Guidance (ha) 0.00 0.00 0.00 0.00 0.72 0.00 0.39 2.22 0.00 3.71 0.00 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00





Page 49

Table 14 - Total features at medium risk of surface water flooding (between 1 in 30 and 1 in 100 chance of flooding in any year)

All

t-y

r-Y

n

Alw

ay

Bee

chw

oo

d

Bet

tws

Ca

erle

on

Ga

er

Gra

ig

La

ng

sto

ne

Lis

wer

ry

Lla

nw

ern

Ma

lpa

s

Ma

rsh

fiel

d

Pil

lgw

enll

y

Rin

gla

nd

Ro

ger

sto

ne

Sh

aft

esb

ury

St.

Ju

lia

ns

Sto

w H

ill

Tre

deg

ar

Pa

rk

Vic

tori

a









Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00







Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.55 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00








Page 50

Table 15 - Total features at low risk of surface water flooding (between 1 in 100 and 1 in 1000 chance of flooding in any year)

All

t-y

r-Y

n

Alw

ay

Bee

chw

oo

d

Bet

tws

Ca

erle

on

Ga

er

Gra

ig

La

ng

sto

ne

Lis

wer

ry

Lla

nw

ern

Ma

lpa

s

Ma

rsh

fiel

d

Pil

lgw

enll

y

Rin

gla

nd

Ro

ger

sto

ne

Sh

aft

esb

ury

St.

Ju

lia

ns

Sto

w H

ill

Tre

deg

ar

Pa

rk

Vic

tori

a









Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00







Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.07 0.00 0.00 0.00 0.00 0.00 0.00 0.12 0.00








Page 51

7.2 Common local flood risk management measures

The following measures have been identified common to all wards in the borough.

7.2.1 Maintain flood asset register

NCC will continue to develop and regularly update, a register of all flood risk

assets that are likely to influence local flood risk and coastal erosion. This register

contains details of the condition and ownership of these structures and features

and will be supplemented with an asset maintenance plan for assets owned by

NCC.

7.2.2 Flood investigations

NCC will investigate flooding, when it is considered necessary and appropriate, to

establish the cause, inform the appropriate risk management authorities, and

propose mitigation measures. This will include providing guidance on how to

report a flood incident, contact details and signposting to NRW guidance on

preparing flood plans.

7.2.3 Community flood awareness and resilience

NCC, in conjunction with the RMAs, will liaise with local communities and

businesses to raise awareness on flood risks. This will include encouraging

participation from willing local communities and businesses in managing local

flood risk. This will include signposting to available resources from NRW28.

7.2.4 Culvert inlet grid maintenance safety and operation

review

NCC manage the risk of culvert inlet grid blockage by cleaning and maintaining

inlets (see Section 4.1.1). The grids also prevent unauthorised access. The risk

posed by all grids will be reviewed, validating those grids currently considered

‘critical’. Grid risk will be prioritised based on likelihood and consequence of

blockage.

The requirements of the Health & Safety at Work Act 1974 places a duty of care

on NCC to ensure as far as reasonably practical, the health, safety and welfare at

work of all of their employees. A prioritised programme to review grids and

identify works necessary to ensure all meet minimum standards of safety is

planned. This will consider whether a grid has a safe access route and working

area to clear the screen of debris, material management/storage arrangements, and

whether the grid arrangement is appropriate to reduce the risk of blockage and

unauthorised entry whilst minimising the likelihood of debris build-up. Work will

be completed with reference to NRW guidance on Trash and Security Screens.

28 What to do before, during and after a flood. Available from:

http://naturalresources.wales/flooding/what-to-do-before-during-and-after-a-flood/?lang=en

Accessed on 2/10/15.

http://naturalresources.wales/flooding/what-to-do-before-during-and-after-a-flood/?lang=en





Page 52

Planned and reactive grid maintenance protocols will be reviewed on the basis of

grid risk to optimise and prioritise resources. Grids with the highest risk will be

reviewed as to whether simple remote telemetry to trigger clearance would be

justified. Grids with the lowest risk may be considered for alternative maintenance

approaches on a case by case basis.

7.2.5 Highway surface water gully maintenance

NCC clean all road drains (also called surface water gullies) across the city at

least once a year and reported blocked gullies, provided they can gain access (see

Section 4.1.1).

In some parts of the NCC, the likelihood of blockage is greater for example

parked vehicles frequently obstructing maintenance access and/or deciduous trees.

NCC will review its gully cleansing programme and consider opportunities to

optimise the service based on consideration of the likelihood and impact of a

blockage.

7.2.6 Surface water and land drainage disconnection from

combined sewers

Many parts of the borough are served by a single sewer pipe that has to cope with

both storm and foul water, serving properties and generally highway gullies.

During periods of heavy rainfall, more water gets into the network than it can

cope with. This often causes controlled overflows into rivers and sometimes even

sewer flooding. Direct land drainage may connect to the combined sewer network.

The amount of wastewater requiring treatment and pumping is also increased,

resulting in higher operational costs.

DCWW have an active programme to reduce the surface water entering their

sewers and where possible catch, redirect and slow down the speed at which

surface water enters the sewer, using a range of techniques as part of the

RainScape programme. Such techniques have multiple benefits and are often

undertaken as part of public realm improvements.

NCC will engage with DCWW’s RainScape programme. It is recommend that

prioritised investigations identify historically captured streams and springs into

the combined sewer network29.

7.2.7 Catchment restoration and natural flood management

Natural flood management (NFM) is the alteration, restoration or use of landscape

features to reduce flood risk30. Peak flow is reduced during intense storm events

by working with natural processes to protect, restore and emulate the natural

29 See: Broadhead et al (2015) Finding lost streams and springs captured in combined sewers: a

multiple lines of evidence approach. Available at:

http://onlinelibrary.wiley.com/doi/10.1111/wej.12104/abstract 30 Parliamentary Offices of Science and Technology. (2011, December). Natural Flood

Management.

http://onlinelibrary.wiley.com/doi/10.1111/wej.12104/abstract





Page 53

function of catchments, rivers and flood plains. Such an approach provides

biodiversity and water quality benefits, and is aligned with meeting WFD

catchment restoration objectives and the Water Strategy for Wales.

The Pitt Review31 identified three types of NFM measures:

Water retention through management of infiltration, in particular by protecting

or enhancing soil condition;

Provision of catchment-wide flood water storage such as retention ponds,

floodplain woodlands, or enhanced wetlands and washlands;

Slowing the flow of water by improving the management of river and adjacent

land, including the planting of cover crops and the restoration of smaller

watercourses to a more natural alignment.

Several wards in Newport have largely rural upland sub-catchments, downstream

populated communities and culverted watercourses. Glastir Advance identifies

part of the east of the borough with potential for management to reduce flood risk

and protect water supplies. No locations within the borough were identified by

this mapping as a priority for Water Quality interventions.

Figure 6 - Glastir Advanced Water Quantity Mapping32 showing in green where land

management practices are considered likely to reduce flood risk and protect water

supplies for over 60-70% of the catchment.

Further prioritised investigation with NRW is proposed to prioritise further work,

drawing on the available scoping information including and Forest Research33.

31 The Pitt Review: Lessons learnt from the 2007 Floods (Cabinet Office, 2008) 32 Glastir Advance Mapping. Available from:

http://gov.wales/topics/environmentcountryside/farmingandcountryside/farming/schemes/glastir/gl

astir-advanced/?lang=en Accessed 1/10/15. 33 In 2014, the Environment Agency commissioned Forest Research to identify opportunities for

woodland creation to reduce diffuse pollution and flood risk across England and Wales. High-level

opportunity maps at a (scale of 1 km2) identify parts of Newport as priority areas in catchments of

river waterbodies at risk of failing good status due to diffuse pollutant loads (Nitrate, Phosphate,

Sediment, Pesticides and Faecal Indicator Organisms); areas at risk from flooding from rivers and

http://gov.wales/topics/environmentcountryside/farmingandcountryside/farming/schemes/glastir/glastir-advanced/?lang=en

http://gov.wales/topics/environmentcountryside/farmingandcountryside/farming/schemes/glastir/glastir-advanced/?lang=en





Page 54

NCC, in conjunction with the RMAs, will provide advice to supportive

landowners on sustainable land use management aiming at improving the risk of

flooding. Sustainable land management should consider aspects such as

environmental enhancement, habitat restoration and habitat creation, all of which

can play a role in alleviating flood risk.

surface water and priority areas where runoff from soils is rapid and finally include information on

constraints to woodland planting. In these locations woodland planting could deliver positive

outcomes for water quality and/or flood risk management. See: http://www.forestry.gov.uk/fr/infd-

97xgxx Accessed on 01/10/15.

http://www.forestry.gov.uk/fr/infd-97xgxx

http://www.forestry.gov.uk/fr/infd-97xgxx





Page 55

7.2.8 Summary of Measures

Table 16 – Summary of Borough-wide Measures

Location and

Description

Measure Timescale Indicative Cost Strategic

Context

1 Borough-wide Develop and

publish flood

asset register

Short term

(0-5years)

N/A (Revenue) M35

2 Borough-wide Maintain flood

asset register

Ongoing N/A (Revenue) M35

3 Borough-wide Review flood

events and

lessons learnt


4 Borough-wide Flood reporting

guidance on

NCC website

Short term

(0-5years)

N/A (Revenue) M53

5 Borough-wide Community

flood awareness

& website update


6 Various – 87

culvert inlet

grids

Visual inspection

and prioritisation

Ongoing 10 days FTE M35,

M44

7 Various – 10

critical and 5

H&S failing

culvert inlet

grids

Investigation of

inlet grids

Short term

(0-5years)

£100k nominal estimate

(Inspection £3k + Design

£5k + contingency (30%)

= £10k each)

M35,

M44

8 Various – 10

critical culvert

inlet grids

Replace inlet

grids and

associated access

works

Short term

(0-5years)


(Replacement screen £3k

+ Access works £8k +

prelims/supervision

(30%) + contingency

(30%) = £19k each)

M35,

M44

9 Various –

Assumed 10

H&S failing

culvert inlet

grids

Address H&S

defects

Short term

(0-5years)


(Access works £8k +

prelims/supervision

(30%) + contingency

(30%) = £14k each)

M35,

M44

11 Road gullies Review prog. Ongoing 5days FTE M35

12 Borough-wide Engage with

DCWW works to

reduce surface

water and land

drainage entering

the sewer

network.

Ongoing N/A (Liaison with

DCWW)

M34

13 Borough-wide Prioritised high-

level

investigation into

Catchment

Restoration and

NFM.

Short term

(0-

20years)

N/A (Revenue) M31

Total (non-revenue) 15days FTE & £430k

Recovery and review Preventing

3 0

5 8

Preparing Protecting





Page 56

7.3 Allt-Yr-Yn Ward

7.3.1 Overview

Allt-Yr-Yn Ward is situated in the central part of NCC, to the west of central

Newport. It has a population of 8,78234 and covers an area of 3.83km2, which is

approximately 1.8% of the total area of Newport at 217km2 35. Allt-Yr-Yn slopes

down gently north-west to east. The ward is heavily concentrated with residential

properties, however to the north of the ward open green space dominates. On the

west side of Allt-yr-Yn heights there is a Local Nature Reserve containing ancient

woodland and meadows. There are no Main Rivers in this ward.

7.3.2 Ordinary watercourses and surface water flood risk

The available data indicates limited flooding from ordinary watercourses which

potentially affect a limited number of highways and properties across the urban

area. Problems may also occur in more isolated locations, for example due to

culvert restrictions. As many of the ordinary watercourses are culverted where

they pass through developed areas it is difficult to distinguish between surface

water flooding and flooding from ordinary watercourses.

There are no reported instances of historical flooding from ordinary watercourses

in this ward.

Historic flood information details two instances of flooding due to surface water

in Allt-Yr-Yn which are detailed in the table below. In general these reported

flood incidents relate to surface water flooding where the drainage systems cannot

cope with high intensity rainfall. The reported flood incidents may also relate to

blocked gullies or drains.

Table 17 – Recorded historic local flooding in Allt-yr-yn

Location of Historic Flooding Reason

St Woolos Cemetery Storm Water system issue

Llanthewy Rd j/w Bryngwyn

Rd

Surface Water Flooding/culvert flooding

The table below summarises the impacts of flooding in Allt-Yr-Yn based on the

Surface Water Flood map. The surface water flood maps show flooding

potentially affecting roads and properties which can be broadly clustered into

three main areas, two in the vicinity of Fields Park road near the centre of the

ward and one near Caerau Road in the east of the ward. The areas are affected are

generally classified as low risk, however there are a number of isolated areas of

high/medium risk. The surface water flood maps take a generalised approach to

the representation of drainage systems however the mapping is indicative of areas

most affected during high intensity storms or due to blockages.

34 Office for National Statistics (ONS) 2012 Mid-Year Population Estimate 35 Allt-Yr-Yn Ward Profile (2014) Newport City Council





Page 57

Table 18 – Flood risk map counts for Allt-yr-yn

Totals in

Defined

Area

Risk Counts

Risk to People and Property

High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)

Estimated residents in areas at risk of flooding

depth >0.0m

People (multiplier 2.32, Newport average

household size 2010)

9064 51 144 473

Residential Properties at risk of internal

flooding depth >0.2m

Residential Properties

3907 19 42 100

Essential Services 66 4 4 6

Risk to Economic Activity

Non-Residential Properties in areas at risk of

flooding depth >0.2m 136 9 11 18

Primary/Trunk Roads (km) 48.5 1.6 3.9 12.9

Mail Line Railways (km) 0.00 0.00 0.00 0.00

Agricultural Land - Grades 1, 2 and 3 (ha) 383 0 0 0

Risk to Natural and Historic Environment

Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00

Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00

Ramsar Sites (ha) 0.00 0.00 0.00 0.00

Sites of Special Scientific Interest (SSSI) (ha) 0.00 0.00 0.00 0.00

Sites of Interest for Nature Conservation

(SINC) (ha) 47.86 1.43 1.98 2.98

National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00

Local Nature Reserves (LNR) (ha) 19.98 0.44 0.56 0.87

Ancient Woodland (ha) 8.04 0.00 0.00 0.05

Registered Parks and Gardens (ha) 23.70 0.40 0.65 1.74

Country Parks (ha) 0.00 0.00 0.00 0.00

Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00

Listed Buildings (n) 37 2 5 6


Guidance (ha) 0.00 0.00 0.00 0.00

RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00





Page 58





Page 59

7.3.3 Groundwater

There are no recorded groundwater flood incidents.

7.3.4 Sewer Flooding

There are 31 reported instances of DG5 sewer flooding in this ward.

7.3.5 Measures to reduce local flood risk

The main local flood risks are identified as follows:

Sorrel Drive/Fields Park Road – A number of residential properties are

predicted to be at risk in this location. Whilst there have been no historic

surface water flooding incidents, some sewer flooding is recorded. There are

two culverted ordinary watercourses. No grids are maintained by NCC.

Further investigation is proposed as records are incomplete as to the inlet

arrangement of the culvert. Monitoring is proposed. There may be

opportunities linking to the adjacent Allt-yr-Yn SINC.

St Woolos Cemetery – NCC have recently taken over maintenance of a culvert

from ordinary watercourse serving the cemetery which drains through a filter

bed. Historic ponding of surface water is recorded. Whilst maintenance has

addressed some historic issues, the culvert remains partially blocked at the

outlet following encroachment into the channel. Further investigation is

proposed, which is likely to recommend a new culvert (50m) and outfall.

Woodville Road / Risca Road / Western Avenue – A number of residential

properties and services are predicted to be at medium risk in this location.

There area is served by an adjacent culverted ordinary watercourse. No

records of historic flooding are available. No grids are maintained by NCC in

the upstream area however downstream there is the Nant Coch, Western

Avenue culvert inlet grid which has been identified as ‘critical’ by NCC.

Further investigation is proposed as records are incomplete as to the inlet

arrangement including opportunities for ‘daylighting’ the culverted sections of

the Nant Coch where adjacent open space allows in the Glasllwch playing

fields and Coed-Melyn Park. Monitoring is proposed.

Llanthewy Road/Caerau Road – A number of residential properties and

services are predicted to be at high/medium risk in this location. The area is

served by a combined sewer network with some sewer flooding recorded.

Highway ponding had been experienced due to blocked gullies however NCC

has installed additional gullies and regularly clear them of leaves and other

debris. Continued enhanced highway maintenance is proposed in the short

term, combined with monitoring.





Page 60

The following measures are identified to reduce flood risk.

Table 19 – Local flood risk management measures for Allt-yr-yn

Location and

Description


Context

A1 Sorrel

Drive/Fields

Park Road

Investigate inlet Short term

(0-5 years)

2days FTE M24

A2 Monitor Ongoing N/A (Revenue) M53, M44

A3 St Woolos

Cemetery

Investigate.

Short term

(0-5 years)

£10-20k estimate M24

A4 Replace culvert

and outfall.

Short term

(0-5 years)

Enabling costs

(20%) £20k.

80m culvert

assumed 750mm

dia estimated

between £100k-

£160k

M34

A5 Fields Park

Road/Risca

Road

Investigate inlet

and ‘daylighting’

culverts.

Short term

(0-5 years)

£10-30k estimate M24

A6 Culvert

improvement

works

Medium

term (5-10

years)

Nominal estimate

£50k - £150k

M33

A7 Monitor Ongoing N/A (Revenue) M53, M44

A8 Llanthewy

Road/Caerau

Road

Enhanced

highway drainage

maintenance.


A9 Monitor. Ongoing N/A (Revenue) M53, M44

Total (non-revenue) 2days FTE & £170-360k


3 3

3 3






Page 61

7.4 Alway Ward

7.4.1 Overview

Alway Ward is situated in the central part of NCC, to the east of Central Newport.

It has a population of approximately 8,37134 and an area of 1.76km2, which is

approximately 0.8% of the total area of Newport36. The Ward gently slopes down

towards the Great Western railway to the south and the M4 motorway to the

north, and mainly consists of residential housing.

There are three significant surface water flooding locations, showing a 30 year

extent, within the ward boundary. There are no Main Rivers in this ward.


Culverted ordinary watercourses drain much of the ward. Ponding is shown

upstream of the inlet screen Aberthaw Road within the allotment gardens.

The available data indicates pockets of flooding associated with ordinary

watercourses which potentially affect a number of highways and properties in

three main areas in the south and east of the ward. Problems may also occur in

other areas, for example due to culvert restrictions. As many of the ordinary

watercourses are culverted where they pass through developed areas it is difficult

to distinguish between surface water flooding and flooding from ordinary

watercourses.

The surface water flood maps show flooding potentially affecting roads and

properties which can be broadly clustered into three main areas, two in the south

of the ward near Conway Road and near Liswerry Drive, and one in the east of the

ward in the vicinity of Ringland Road. These three areas are adjacent to ordinary

watercourses. The two areas in the south of the ward are classified as

medium/high risk and the area to the east is generally classified as low risk. The

surface water flood maps take a generalised approach to the representation of

drainage systems however the mapping is indicative of areas most affected during

high intensity storms or due to blockages.

Historic flood information details one record of flooding due to surface water in

Alway which is detailed in the table below. This reported flood incident relates to

surface water flooding from a blocked trash screen; it is likely that other flooding

in the area is caused when similar drainage systems cannot cope with high

intensity rainfall. Flooding may also relate to blocked gullies or drains.

Table 20 – Recorded historic local flooding in Alway


Ringland Circle Surface water flooding caused by blocked inlet

grid on a culverted ordinary watercourse.

Affected approximately 28 residential properties.

36 Alway Ward Profile (2014) Newport City Council





Page 62

The table below summarises the impacts of flooding in Alway based on the

Surface Water Flood map, shown below.

Table 21 – Flood Risk Map counts for Alway

Totals in

Defined

Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)

Estimated residents in areas at risk of


Estimated People (multiplier 2.32, Newport

average household size 2010)

7742 107 304 909




3337 33 102 268











Ramsar Sites (ha) 0.00 0.00 0.00 0.00

Sites of Special Scientific Interest (SSSI)

(ha) 0.00 0.00 0.00 0.00


(SINC) (ha) 20.25 0.12 0.61 2.00





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00





Page 63





Page 64

7.4.3 Groundwater






Ringland Circle/Stanford Road – A high number of residential properties are

predicted to be at medium risk in this location. The historic surface water

flooding incident is attributed to a culvert inlet grid blockage. The fire service

records include the pumping out a sheltered housing unit. NCC have since

installed grid overflows, the grids have been identified as ‘critical’ for

clearance. Sewer flooding to a number of properties is recorded however the

sewerage is recorded to be a separate foul and storm system. The culverted

ordinary watercourse discharges downstream into a storage lagoon structure

and further investigation into ownership responsibilities and water level

management is planned (see Section 7.16.5, Ringland Ward). Monitoring and

further investigation is proposed of the culvert capacity and inlet arrangement.

Ringland Avenue/Dents Hill – A small number of residential properties are

predicted at risk in this location. Lack of maintenance of the culverted

watercourse has been highlighted to present a blockage risk. Liaison with

riparian owners is planned.

Liswerry Park Drive – Localised highway ponding occurs when highway

gullies become blocked along the railway underpass. A number of residential

properties are predicted at risk however no flooding is recorded in this

location. The area would be prone to surface water ponding if a culvert

adjacent and under the railway were to become blocked. Investigation into

maintenance responsibilities and inlet arrangement is planned. Adjacent

Lliswerry Playing Fields and Angling Ponds SINC may offer additional

attenuation storage to hold back peak flows, should an intervention be

justified.

Somerton Road – A large number of residential properties are predicted at

high risk however no recent incidents have been recorded. It is likely that the

predictions are precautionary given that culverts run adjacent and under the

railway. Attenuation storage to hold back peak upstream flows in Beechwood

Park and the Aberthaw Road allotments should be considered. Investigation

into the culvert capacity, inlet arrangement and maintenance responsibility is

planned. There are anecdotal reports of historic surface water flooding during

intense rainfall as drainage systems serving the area south of Chepstow Road

became overwhelmed. Highway gullies drain into the combined sewer

network.





Page 65

Gibbs Road – Highway ponding is predicted and there have been two

incidents requiring fire service pumping. Further investigation of the highway

drainage and adjacent culvert is proposed.


Table 22 - Local Flood Risk Management measures for Alway

Location and

Description

Measure Timescale Indicative

Cost

Strategic

Context

B1 Ringland

Circle/Stanford

Road

Investigate and establish

local flood action group to

monitor & assist with debris

clearance.

Short term

(0-5)

3days FTE

and £5k

(public

meeting)

M43,

M44

B2 Investigate culvert capacity

and identify hydraulic pinch-

points.

Short term

(0-5 years)

£5-10k M24,

M53

B3 Monitor Ongoing N/A

(Revenue)

M53,

M44

B4 Ringland

Av/Dents Hills

Liaison with riparian owners

regarding

maintenance/operation

responsibilities.

Short term

(0-5 years)

1day FTE M24,

M43


(Revenue)

M53,

M44

B6 Liswerry Park

Drive

Investigate culvert

maintenance responsibilities

and risk of blockage.

Short term

(0-5 years)

3days FTE

plus £2k

survey

M24

B7 Inlet improvement works

allowance

Short term

(0-5 years)

£20-40k

(nominal

estimate)

M33

B8 Monitor Ongoing N/A M53,

M44

B9 Somerton Road Investigate culvert

maintenance responsibilities

and risk of blockage.

Consider upstream

attenuation options.

Short term

(0-5 years)

5days FTE M24,

M34

B10 Enhanced highway drainage

maintenance.

Ongoing N/A

(Revenue)

M35

B11 Inlet improvement works

allowance

Short term

(0-5 years)

£20-40k

(nominal

estimate)

M33


(Revenue)

M53

B13 Gibbs Road Investigate culvert and

highway drainage

Short term

(0-5 years)

3days FTE M24

B14 Enhanced highway drainage

maintenance.

Short term

(0-5 years)

N/A

(Revenue)

M35


(Revenue)

M53,

M44

Total (days non-revenue) 15days FTE & £30-57k


6 5

7 5






Page 66

7.5 Beechwood Ward

7.5.1 Overview

Beechwood Ward is situated in the central part of NCC, to the east of Central

Newport. It has a population of approximately 7,58534 and an area of 1.52km2,

which is approximately 0.7% of the total area of Newport37. The ward steeply

slopes north to south and mainly consists of residential housing. The topography

is similar to Alway ward. The centre of the ward consist of Beechwood Park.

The Main River Usk borders the north of this ward


The available data indicates some degree of high risk flooding associated with the

area to the south of the ward from ordinary watercourses, ponding behind the

railway embankment, which potentially affects a limited number of highways and

properties in the south and east of the ward. Problems may also occur in isolated

locations, for example due to culvert restrictions. As many of the ordinary



watercourses.


in this ward.


properties which can be broadly clustered into two main areas. The first runs from

the top of Woodland Park Road in the centre of the ward down to Chepstow road

in the South West of the ward. This shows potential overland flow of water with a

medium/high risk to some properties. The second cluster is in the south of the

ward adjacent to the ordinary watercourse in the vicinity of Conway Road

alongside the railway and represents a medium/high risk. Other areas affected are

generally classified as low risk, however there are a number of isolated areas of

high/medium risk. The surface water flood maps take a generalised approach to



Historic flood information details three instances of flooding due to surface water

in Beechwood. These incidents relate to surface water flooding where the

drainage systems cannot cope with high intensity rainfall.

Table 23 – Recorded historic local flood events in Beechwood


Heather Road, Beechwood Surface Water Flooding (Flash Flood)

Christchurch Road, Beechwood Surface Water Flooding (Flash Flood)

Woodland Road, Beechwood Surface Water Flooding (Flash Flood)

37 Beechwood Ward Profile (2014) Newport City Council





Page 67

The table below summarises the impacts of flooding in Beechwood based on the


Table 24 – Flood Risk Mapping counts for Beechwood

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





7890 32 186 724




3401 4 46 205











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 2.45 0.00 0.00 0.02


(SINC) (ha) 1.77 0.00 0.01 0.05





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 68





Page 69

7.5.3 Groundwater






Conway Road – As with Somerton Road in Alway Ward, there are

anecdotal reports of historic surface water flooding during intense rainfall

as drainage systems serving the area south of Chepstow Road became

overwhelmed. A high number of residential properties are predicted at

high risk however no recent incidents have been recorded. Highway

gullies drain into the combined sewer network. Culverts run adjacent and

under the railway. Investigation into the arrangement and maintenance

responsibilities is planned.

St Julian’s Road / Lundy Drive – A small number of residential properties

are predicted at risk where a topographic depression causes surface water

to pond. Highway drainage gullies are understood to be served by a

combined sewer network and some sewer flooding has been recorded.

Further investigation is planned. Regular monitoring and gully clearance is

planned. Liaison with DCWW is also proposed on surface water

disconnection opportunities.

Forest Glade / Woodland Road / Kensington Place – A number of

residential properties are predicted to be at medium risk as a topographic

depression causes surface water ponding. Historic flooding is recorded by

NCC to one property and three flooding incidents have required Fire

Service attendance. The area has a high number of trees and leaves which

can clog or block highway gullies. Additional gullies have been recently

installed by NCC. Investigation into disconnection of highway gullies and

attenuation storage to hold back peak upstream flows in available open

space in Woodland Park is planned. Regular monitoring and gully

clearance is planned.

Cotman Close – A cluster of several properties are predicted at

low/medium risk of flooding. No incidents have been recorded and further

investigation is planned, given the area is likely to benefit from adjacent

motorway drainage.





Page 70


Table 25 - Local Flood Risk Management measures for Beechwood

Location and

Description


Cost

Strategic

Context

C1 Conway Road Investigate culvert

maintenance

responsibilities and risk

of blockage.

Short term

(0-5 years)

3days FTE

M24

C2 Enhanced highway

drainage maintenance.

Ongoing N/A

(Revenue)

M35

C3 Inlet improvement

works allowance

Short term

(0-5 years)

£20-40k

(nominal

estimate)

M33

C4 Monitor Ongoing N/A

(Revenue)

M53, M44

C5 St Julian’s Road /

Lundy Drive

Enhanced highway


Ongoing N/A

(Revenue)

M35

C6 Liaison with DCWW

on surface water sewer

disconnection

opportunities.

Short term

(0-5 years)

5days FTE

M24, M34


(Revenue)

M53, M44

C8 Forest Glade /

Woodland Road /

Kensington Place

Investigate highway

gully disconnection.

Short term

(0-5 years)

3day FTE

plus £5k

survey

M24

C9 Enhanced highway


Ongoing N/A

(Revenue)

M35


(Revenue)

M53, M44

C11 Cotman Close Investigate drainage

maintenance

responsibilities.

Short term

(0-5 years)

2days FTE

M24


(Revenue)

M53, M44

Total (non-revenue) 13 days FTE and £25-

45k


4 4

4 5






Page 71

7.6 Bettws Ward

7.6.1 Overview

Bettws Ward is situated in the northern part of NCC, to the north of Central


which is approximately 2.4% of the total area of Newport38. The ward gently

slopes north-west to south-east, with predominantly residential housing. There is

some commercial buildings within the valley floor. Surrounding this developed

area the land-use is composed of forestry, livestock and arable fields.

There are no Main Rivers in this ward.


The available data indicates medium/high risk flooding from ordinary

watercourses including the Malpas Brook running down the east edge of the ward,

and a large flood storage area to the south of the ward. There are few residential

properties in this area. In the more urbanised area running through the centre of

the ward from east to west there are properties at medium/high risk of flooding.

Problems may also occur in isolated locations, for example due to culvert

restrictions. As many of the ordinary watercourses are culverted where they pass

through developed areas it is difficult to distinguish between surface water

flooding and flooding from ordinary watercourses.


in this ward.


properties which can be broadly clustered into three main areas running from east

to west across the ward in the area encircled by Monnow Way Road. There are

areas of medium and high risk. The surface water flood maps take a generalised

approach to the representation of drainage systems however the mapping is

indicative of areas most affected during high intensity storms or due to blockages.

Historic flood information details one instance of flooding due to surface water in

Bettws which is detailed in the table below. This reported flood incident relates to

surface water flooding where the drainage systems cannot cope with high

intensity rainfall. The reported flood incidents may also relate to blocked gullies

or drains.

Table 26 – Recorded historic flooding in Bettws


Meon Close, Bettws Surface Water Flooding (Flash Flood)

38 Bettws Ward Profile (2014) Newport City Council





Page 72

The table below summarises the impacts of flooding in Bettws based on the


Table 27 – Flood Risk Map counts for Bettws

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





7793 181 311 1148




3359 43 77 312











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 0.00 0.00 0.00 0.00


(SINC) (ha) 79.48 13.53 23.69 41.38





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 73





Page 74

7.6.3 Groundwater






Monnow Way – a large number of residential properties and some services are

predicted to be at low risk adjacent to the Malpas Brook. There are no reports

of historical flooding in the area predicted and the area is served by an

adjacent ordinary watercourse. Maintenance of the watercourse to maintain

channel capacity and further monitoring is proposed.

Meon Close - To the north of Monnow Way, historic surface water flooding is

recorded, requiring fire service pumping. No surface water flooding is

predicted and further investigation is proposed.

Bettws Lane (adjacent to High School) – downstream of Monnow Way the

highway gullies are prone to blockage from leaf debris causing surface water

ponding. A high risk of surface water flooding is predicted. Regular

monitoring and gully clearance is planned.

Adjacent to Bettws Lane there are flood water storage lagoons where flood

water is designed to attenuate during times of high flow, with the pass forward

capacity controlled by a flood gate. NCC operate and maintain the structure.

Further investigation into the control requirements is needed, and maintenance

of a flood containment wall is planned. The structure will be evaluated as to

whether it requires formal designation as a reservoir.

Tone Close – a large number of residential properties and some services are

predicted to be at low risk. There are no reports of historical flooding in the

area. At the head of the topographic depression, the ordinary watercourse is

culverted to the northeast. Further investigation of the inlet arrangement at

Waveney Close is proposed.

Parc-y-Brain Road – Surface runoff from adjacent land had been prone to

causing highway flooding. The fire service was required to evacuate

occupants of a stranded car. Improvement works by NCC including culvert

upsizing and new highway gullies were completed in 2013. Their

effectiveness will be monitored.

Darent Road – Downstream of Parc-y-Brain Road, a large number of

residential properties are predicted to be at high risk of surface water flooding,

with the Bettws Brook running over Ogmore Crescent. The Ogmore Crescent,

Bettws culvert inlet grid has been identified as ‘critical’ by NCC. There are no

reports of historical flooding in the area. Further monitoring is proposed.





Page 75


Table 28 – Local Flood Risk Management measures for Bettws.

Location

and

Description


Cost

Strategic

Context

D1 Monnow

Way

Enhanced watercourse

maintenance.

Ongoing N/A

(Revenue)

M35

D2 Monitor Ongoing N/A

(Revenue)

M53,

M44

D3 Meon Close Investigate surface water

flood risk.

Medium

term (5-10

years)

3days FTE

M24


(Revenue)

M53,

M44

D5 Bettws Lane Investigate downstream

flood attenuation structure.

Short term

(0-5 years)

5 days FTE

plus £10k

survey

M24

D6 Nominal allowance for

repairs of downstream

attenuation structure

Short term

(0-5 years)

£50k-£200k

nominal

estimate

M33

D7 Enhanced highway drainage

maintenance.

Ongoing N/A

(Revenue)

M35


(Revenue)

M53,

M44

D9 Tone Close Investigate inlet

arrangement at Waveney

Close

Medium

term (5-10

years)

2days FTE

plus £2k

survey

M24


(Revenue)

M53,

M44

D11 Parc-y-Brain

Road

Monitor Ongoing N/A

(Revenue)

M53,

M44

D12 Darent Road Monitor Ongoing N/A

(Revenue)

M53,

M44

D13 Bettws Ward Investigate and promote

application of Glastir

Advanced given potential

suitability for land

management practices to

reduce flood risk and protect

water supplies

Short term

(0-5 years)

10days FTE M31

Total (non-revenue) 21days FTE and £71-

212k


6 3

6 4






Page 76

7.7 Caerleon Ward

7.7.1 Overview

Caerleon Ward is situated along the northern border of NCC, to the north-east of

Central Newport. The suburban village has a population of approximately 7,97934

and an area of 14.53km2, which is approximately 5.4% of the total area of

Newport39. The ward consists of two significant hills, to the west and east, which

steeply slope down to the valley floor in the centre of Caerleon which comprises

residential and commercial buildings. The River Usk and Afon Lwyd flow

through the centre of the ward to their confluence west of the Celtic Manor.


The available data indicates some areas of medium/high risk flooding from

ordinary watercourses in the north of the ward and a patch of low risk in the

south. Although there are few residential properties in these areas there is a risk

that Ponthir Road could be affected. Problems may also occur in isolated




watercourses.

There are two reported historical flooding incidents from ordinary watercourses.

Table 29 – Recorded historic ordinary watercourse flooding in Caerleon


St Cadoc's Close Surface water flooding, from natural exceedence

of ordinary watercourse

Bellin Close Surface water flooding, from natural exceedence

of ordinary watercourse


properties which can be broadly clustered into three main areas towards the centre

of the ward to the west of the river Usk. They are generally areas of low risk but

with small spots of medium and high risk. The surface water flood maps take a

generalised approach to the representation of drainage systems however the

mapping is indicative of areas most affected during high intensity storms or due to

blockages.

There are two recorded instances of surface water flooding in Caerleon, detailed

in the table below. This reported flood incident relates to surface water flooding

where the drainage systems cannot cope with high intensity rainfall. The reported

flood incidents may also relate to blocked gullies or drains.

Table 30 – Recorded historic surface water flooding in Caerleon


Ashwell Cottages, Caerleon Surface Water Flooding (Flash Flood)

Roman Way Surface water flooding

39 Caerleon Ward Profile (2014) Newport city council





Page 77

The table below summarises the impacts of flooding in Caerleon based on the


Table 31 - Flood Risk Map counts for Caerleon

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100

to 1 in

1000

chance in

any year)





8248 19 84 654




3555 4 11 91











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 63.93 0.00 0.01 0.06


(SINC) (ha) 166.02 6.22 8.26 17.79





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 50.85 0.72 1.46 5.24






Page 78





Page 79

7.7.3 Groundwater






Isca Road – Highway ponding is recorded where discharge from gullies is

restricted or locked during periods of high tide. NRW are proposing a tidal

flood risk scheme in the area and continued partnership working between

NRW and NCC is proposed to address residual surface water flood risk is

proposed.

Roman Way – Several culvert inlet grids are located in this area and have been

prone to blockage. The Fire Service have recorded two incidents. NCC

records surface water flooding in St Cadoc’s Close and Roman Way. A large

number of properties are predicted at low/medium risk of flooding.

Downstream services risk include the college and access route to the hospital,

where Fire Service pumping has been recorded. Sewer flooding incidents are

recorded. The culvert inlet screen adjacent to Gwladys Place has blockage

issues and the St Cadoc’s Close inlet grid is identified by NCC as ‘critical’.

Downstream there is open space which could be used as part of improvements

to the existing drainage. Further investigation and monitoring is planned,

including liaison with DCWW and investigation of the inlet grid arrangement.

Roman Road – A large number of properties are predicted at low/medium risk

of flooding. Whilst no surface water flooding incidents are recorded, some

property sewer flooding incidents are recorded. The area is drained by Home

Farm culvert to the adjacent River Usk. The surface water maps demonstrate

the risk should the culvert block. Inspection and maintenance of the tidal flap,

culvert inlet and liaison with DCWW is planned.

Castle Street / High Street / Castle Close / Tram Road – Small numbers of

properties and services are predicted at low/medium risk throughout the area.

No surface water flooding is recorded however property sewer flooding

incidents are recorded and the Fire Service has attended to pump flooding of

the highway. Monitoring and liaison with DCWW is planned.

Ponthir Road / Malthouse Road – A small number of properties and the

highway are predicted at high risk. The watercourse runs under the road

through a culvert. Maintenance and monitoring is planned.

Bellin Close / Brooklea / Forge Close – A small number of properties are

predicted at medium/low risk. Surface water flooding has been recorded at

Bellin Close. The culvert inlet is located in a wooded area and is prone to

blockages. The adjacent College ground may provide open space for

mitigation measures such as additional conveyance options. NCC developed





Page 80

an outline downstream culvert enhancement proposal which was unable to

progress due to lack of funding. Further investigation and monitoring is

planned.


Table 32 - Local Flood Risk Management measures for Caerleon

Location and

Description


Cost

Strategic

Context

E1 Isca Road Partnership working with

NRW to reduce residual

surface water risk.

Ongoing N/A

(Revenue)

M35

E2 Monitor Ongoing N/A

(Revenue)

M53,

M44

E3 Roman Way Investigate culvert inlet

screening arrangement

and liaison with DCWW

on surface water sewer

disconnection

opportunities.

Short term

(0-5 years)

5days FTE

plus £5k

surveys

M24,

M34


(Revenue)

M53,

M44

E5 Roman Road Investigate culvert inlet

and maintain tidal flap.

Liaison with DCWW on

surface water

disconnection

opportunities

Short term

(0-5 years)

5days FTE

plus £5k

surveys

M24,

M35,

M34


(Revenue)

M53,

M44

E7 Castle Street /

High Street /

Castle Close /

Tram Road


surface water

disconnection

opportunities

Short term

(0-5 years)

5days FTE

plus £5k

surveys

M24,

M35


(Revenue)

M53,

M44

E9 Ponthir Road /

Malthouse Road

Culvert maintenance Ongoing N/A

(Revenue)

M35


(Revenue)

M53,

M44

E11 Bellin Close /

Brooklea / Forge

Close

Investigate culvert inlet

arrangement, and

justification for

downstream culvert

enhancement scheme.

Short term

(0-5 years)

15days FTE

plus £5k

surveys

M24,

M35,

M34

E12 Culvert scheme Mid-term

(5-10

years)

£50k-£150k

nominal

estimate

M35


(Revenue)

M53,

M44


170k


6 4

6 9






Page 81

7.8 Gaer Ward

7.8.1 Overview

Gaer Ward is situated in the central part of NCC, to the south-west of Central


which is approximately 1.3% of the total area of Newport40. The ward gently

slopes north to south, with residential housing concentrated to the east of the

ward. The hillside catchment is drained by the Ebbw River which flows around

hillside to the west of the ward.


The available data indicates low risk of flooding from ordinary watercourses,

however problems could occur in isolated locations, for example due to culvert




There no reported instances of historical flooding from ordinary watercourses in

this ward.

The surface water flood maps show medium/high risk of flooding potentially

affecting roads and properties which can be broadly clustered into two main areas;

in the vicinity of Harlech Retail Park in the centre of the ward and near Docks

Way in the south west of the ward. The surface water flood maps take a



blockages.

There are no reported instances of historical flooding from surface water in this

ward.

The table below summarises the impacts of flooding in Gaer based on the Surface Water

Flood map, shown below.

40 Gaer Ward Profile (2014) Newport city council





Page 82

Table 33 - Flood Risk Map counts for Gaer

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





9185 9 51 459




3959 0 7 98











Ramsar Sites (ha) 0.00 0.00 0.00 0.00

Sites of Special Scientific Interest (ha) 0.00 0.00 0.00 0.00

Sites of Interest for Nature Conservation(ha) 43.25 3.15 3.88 5.08





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.25 0.00 0.00 0.00






Page 83





Page 84

7.8.3 Groundwater





The main flood risks are identified as follows:

Cardiff Road / Harlech Road – A small number of properties and the B4237

are predicted at low/medium risk of flooding. The Fire Service have recorded

an incident of highway flooding to the north. To the south sewer flooding

incidents are recorded. Monitoring and investigation into the condition and

maintenance of the culvert under the railway which discharges into the Cefn

Adda Reen is proposed, along with liaison with DCWW.

St Brides Crescent - A large number of properties are predicted at low risk of

flooding. No surface water flooding incidents are recorded. The area is served

by a storm water pumping station, investigation into its maintenance and

monitoring is planned.

St Davids Crescent – A small number of properties are predicted at low risk of

flooding. The Fire Service have recorded an incident of property flooding.

Monitoring is proposed.

Gaer Road / Dickens Drive – The highway is predicted at medium risk of

flooding and the Fire Service have recorded an incident of highway flooding.

Monitoring and a review of highway drainage maintenance is proposed.

Gaer Ponds / Shakespeare Crescent – Flooding of the highway has been

experienced. NCC have identified Gaer Ponds gully inlet as ‘critical’.

Significant maintenance on the ponds was completed in 2014. Investigation

and maintenance of the overflow culvert running under the railway is

proposed, with monitoring.

Docks Way / Maesglas Close – A small number of properties and the highway

(A48) are predicted at low/medium risk of surface water flooding. Occasional

highway surface water flooding is recorded. Anecdotal comments suggest that

issues with the operation of the storm water pumping station may be a

contributory factor. NCC storm pumping station is identified as ‘high risk’ and

so has telemetry installed. Further investigation into the pumping station and

monitoring is planned.





Page 85


Table 34 – Local Flood Risk Management measures identified for Gaer

Location and

Description


Cost

Strategic

Context

F1 Cardiff Road /

Harlech Road

Investigate culvert

maintenance/condition

under railway.

Short term

(0-5 years)

3days FTE

plus £5k

survey

M24,

M34

F2 Liaison with DCWW on

surface water sewer

disconnection opportunities.

Short term

(0-5 years)

5days FTE

M24,

M34

F3 Monitor Ongoing N/A

(Revenue)

M53,

M44

F4 St Brides

Crescent

Investigate storm water

pumping station

maintenance.

Short term

(0-5 years)

3days FTE M24,

M34


(Revenue)

M53,

M44

F6 St Davids

Crescent

Monitor Ongoing N/A

(Revenue)

M53,

M44

F7 Gaer Road /

Dickens Drive

Review and enhancement of

highway drainage

maintenance.

Short term

(0-5 years)

3days FTE M35


(Revenue)

M53,

M44

F9 Gaer Ponds /

Shakespeare

Crescent

Investigation and

maintenance of overflow

culvert.

Short term

(0-5 years)

3 days FTE

and £3k

survey

M35

F10 Routine pond maintenance Ongoing £15-25k

(nominal

estimate)

M35


(Revenue)

M53,

M44

F12 Maerglas

Close / Docks

Road

Investigate storm water

pumping station

maintenance.

Short term

(0-5 years)

3days FTE M24,

M34


(Revenue)

M53,

M44


33k


6 4

6 7






Page 86

7.9 Graig Ward

7.9.1 Overview

Graig Ward is situated along the northern and western border of NCC, located to

the west of Central Newport. It has a population of 6,11634 and an area of

14.34km2, which is approximately 6.6% of the total area of Newport41. The ward

consists of a hill peak to the north, which steeply slopes down to the valley floor,

west to east. There is limited development within this ward, mainly consisting of

arable and livestock fields, however there is some housing concentrated to the east

of the ward.

The Main River Ebbw runs down the east boundary of this ward and the river

Rhymney runs down the western boundary.


The available data indicates some isolated patches of medium/high risk flooding

from ordinary watercourses in the central and south east of the ward. Problems

may also occur in isolated locations, for example due to culvert restrictions. As

many of the ordinary watercourses are culverted where they pass through

developed areas it is difficult to distinguish between surface water flooding and

flooding from ordinary watercourses.

There are two reported instances of historical flooding from ordinary watercourses

in Graig which are detailed in the table below:


Springfield, Rhiwderin Surface water flooding caused by blocked trash

screen and collapsed pipe

Ffos-y-Fran, Bassaleg Surface water flooding from an ordinary

watercourse, natural exceedence flood event


properties which can be broadly clustered into two main areas particularly around

the south east area of the ward by Rhiwderin and Bassaleg. They are generally

areas of low risk but with small spots of medium and high risk. The surface water

flood maps take a generalised approach to the representation of drainage systems

however the mapping is indicative of areas most affected during high intensity

storms or due to blockages.


Graig which is detailed in the table below. This reported flood incident relates to

surface water flooding where the drainage systems cannot cope with high


or drains.


Church Crescent, Bassaleg Surface Water Flooding (Flash Flood)

41 Graig Ward Profile (2014) Newport city council





Page 87

The table below summarises the impacts of flooding in Graig based on the


Table 35 - Flood Risk Map counts for Graig

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100

to 1 in

1000

chance in

any year)





5765 53 102 371




2485 12 21 66











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 3.76 0.00 0.03 0.30


(SINC) (ha) 149.44 5.85 7.76 11.98





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 36.56 0.39 1.00 2.95






Page 88





Page 89

7.9.3 Groundwater






Park View / Pye Corner – Located on the boundary with Rogerstone, the

highway is predicted to have a high risk of flooding at the railway underpass.

Recurring surface water flooding is recorded, affecting residential gardens.

Anecdotal comments that debris blockages of the ordinary watercourse has

been a contributory factor; further investigation and liaison with riparian

owners is planned. There are also property sewer flooding incidents from the

combined network, and liaison with DCWW is also proposed.

Rhiwderin – A small number of properties, services and the highway are

predicted at high risk of flooding. Affected properties include Springfield

Lane/Road, Caernarvon Road and Oaklands Park Drive. An historic surface

water flooding incident is recorded and the Fire Service have recorded an

incident of property flooding. The area is served by two culverted ordinary

watercourses. Monitoring and further investigation into the arrangement of the

inlet grids is planned. Some property sewer flooding is recorded and liaison

with DCWW is also proposed as there are anecdotal comments of issues

arising from the interaction between the storm and foul network. There may

be opportunities to attenuate flows upstream.

Bassaleg – A number of properties and services are predicted at high/medium

risk of surface water flooding. Affected property locations include Farriers

Gate, Churchmead, and upstream at Ffos-y-Fran/Caerphilly Road where a

surface water flooding incident is recorded in the PFRA. A partially culverted

ordinary watercourse runs through the affected area. Anecdotal comments are

that mud on the public highway from farm vehicles makes highway drainage

prone to blockage. NCC have recently worked with a riparian owner adjacent

to Penylan Road to divert highway flooding into an adjacent ditch. Monitoring

and investigation into the arrangement, condition, capacity and maintenance

responsibilities of the culverts under the A467 and A468 is planned. There

may be opportunities to attenuate flows upstream or improvements to the

culvert. Some sewer flooding incidents are also recorded of the combined

network, and liaison with DCWW is also proposed.

Forge Lane – A number of properties are predicted at high risk of surface

water flooding. The Forge Lane, Rogerstone culvert inlet screen is considered

‘critical’ by NCC. There may be opportunities to attenuate flows upstream or

improvements to the culvert. Further investigation and monitoring is planned.





Page 90


Table 36 – Local flood risk management measures for Graig

Location and

Description


Cost

Strategic

Context

G1 Park View /

Pye Corner

Further investigation and

liaison with riparian

owners.

Short term

(0-5 years)

3days FTE M24, M43

G2 Liaison with DCWW on

surface water sewer

disconnection

opportunities.

Short term

(0-5 years)

4days FTE

M24, M34

G3 Monitor Ongoing N/A

(Revenue)

M53, M44

G4 Rhiwderin Further investigation into

culvert arrangement and

inlet grids

Short term

(0-5 years)

4days FTE

plus £2k

survey

M24, M35


sewer improvement

opportunities.

Short term

(0-5 years)

4days FTE

M24, M34


(Revenue)

M53, M44

G7 Bassaleg Investigation into the

arrangement, condition,

capacity and maintenance

responsibilities of the

culverts.

Short term

(0-5 years)

4days FTE

plus £2k

survey

M24


surface water sewer

disconnection

opportunities.

Short term

(0-5 years)

4days FTE

M24, M34


(Revenue)

M53, M44

G10 Forge Lane Further investigation into

culvert arrangement and

inlet grids

Short term

(0-5 years)

3days FTE

plus £2k

survey

M24, M35


(Revenue)

M53, M44

Total (non-revenue) 25days FTE and £6k


3 6

4 4






Page 91

7.10 Langstone Ward

7.10.1 Overview

Langstone Ward is situated along the northern and eastern border of NCC, located

to the north-east of Central Newport. It has a population of 4,36634 and an area of

30.43km2, which is approximately 14.02% of the total area of Newport42. A

hillslope ridge dominates the north of the ward, steeply sloping south to a valley

containing residential properties.

There is a short length of Main River in this ward.



from ordinary watercourses in south of the ward. Problems may also occur in

isolated locations, for example due to culvert restrictions. As many of the ordinary



watercourses.

There is one reported instance of historical flooding from ordinary watercourses

in Langstone which is detailed in the table below:


Ford Farm Lane Ordinary watercourses, properties flooded at

Forge Farm Lane due to a blocked trash screen

The surface water flood maps show two clusters of issues around Langstone and

Llanmartin. They are generally areas of low risk but with small spots of medium

and high risk. The surface water flood maps take a generalised approach to the

representation of drainage systems however the mapping is indicative of areas



in Langstone which are detailed in the table below. This reported flood incident

relates to surface water flooding where the drainage systems cannot cope with

high intensity rainfall. The reported flood incidents may also relate to blocked

gullies or drains.


A48 Chepstow Rd, Langstone Surface Water Flooding/culvert flooding

Magor Road, nr j/w Waltwood

Rd

Surface Water Flooding/culvert flooding

42 Langstone Ward Profile (2014) Newport city council





Page 92

The table below summarises the impacts of flooding in Langstone based on the


Table 37 – Flood Risk Map counts for Langstone.

Totals in

Defined

Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)


depth >0.0m



4081 23 58 258




1759 6 9 38











Ramsar Sites (ha) 0.00 0.00 0.00 0.00



(SINC) (ha) 641.88 1.51 3.23 7.88





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 42.65 2.22 3.92 7.93






Page 93





Page 94

7.10.3 Groundwater






Magor Road / Ford Farm Lane / Carpenter Close / Miller Close – A

number of properties and highways are predicted at high/medium risk of

surface water flooding. The Fire Service record an incident of external

flooding. An earlier historic flooding incident is attributed to a blocked

debris inlet screen and liaison with riparian owners regarding woodland

management and blockage risk is planned, in addition to a review of the

inlet arrangement and monitoring. Anecdotal comments also highlight

concerns over downstream culvert capacity throttling flows; further

investigation is proposed, with an allowance for works to upsize the

culvert.

Chepstow Road, Langstone - Immediately upstream of the above issue, a

small number of properties, the highway (A48) and a service are predicted

at risk of flooding. Recurrent surface water flooding of the road is

recorded. The Fire Service record an incident of pumping flood water to

clear the highway. Investigation into the upstream culvert inlet

arrangement is proposed, with monitoring.

Magor Road, Llanmartin – Waltwood Road is predicted at high risk of

surface water flooding. Recurring surface water of the road is recorded.

Recent works to improve highway drainage have been completed,

including new gully connections. NCC identify the A48 Langstone inlet

grid to be ‘critical’. The network discharges into a downstream

watercourse and anecdotal comments are that this throttles the network

due to lack of maintenance. Liaison with the riparian owner is planned,

with monitoring. Anecdotal comments note problems with culvert inlet

grid and further investigation, ongoing maintenance and monitoring is

planned.

Blossom Close / Priory Grove / Court Meadow – A number of clusters of

properties and the highway are predicted at high/medium risk of surface

water flooding. Whilst no historic surface water incidents are recorded by

NCC, the Fire Service record a number of incidents of flooding of

property. Anecdotal comments note problems with culvert inlet grid and

further investigation, ongoing maintenance and monitoring is planned.

Attenuation storage upstream of Priory Farm may be an option to hold

back peak flows.





Page 95

Penhow, St Brides Brook – The A48 highway is predicted at high risk of

surface water flooding and the Fire Service record two incidents of

pumping flood water to clear the highway. NCC identify the A48 Penhow

inlet grid to be ‘critical’. Anecdotal comments are that land drainage

contributes to highway drainage issues and property flooding is

experienced, and this is exacerbated by throttling due to restrictions

downstream. The drainage network is complex and further investigation

and monitoring is proposed.





Page 96


Table 38 – Local flood risk management measures for Langstone.

Location and

Description


Cost

Strategic

Context

H1 Magor Road / Ford

Farm Lane /

Carpenter Close /

Miller Close

Liaison with riparian

owners regarding

woodland

management.

Short term

(0-5 years)

1day FTE

M24, M43

H2 Investigation into

culvert capacity,

arrangement and inlet

grids

Short term

(0-5 years)

3days FTE

plus £2k

survey

M24,

M35, M44

H3 Works to increase

culvert capacity

Short term

(0-5 years)

£20-80k

(nominal

estimate)

M33, M34

H4 Monitor Ongoing N/A

(Revenue)

M53, M44

H5 Chepstow Road,

Langstone

Further investigation

into upstream culvert


grids

Short term

(0-5 years)

3days FTE

M24, M35


(Revenue)

M53, M44

H7 Magor Road,

Llanmartin

Liaison with riparian

owners.

Short term

(0-5 years)

1day FTE M24, M43

H8 Investigation into

culvert capacity,


grids

Short term

(0-5 years)

N/A

M53, M44

H9 Works to increase

culvert capacity

Short term

(0-5 years)

£20-80k

(nominal

estimate)

M33, M34


(Revenue)

M53, M44

H11 Blossom Close /

Priory Grove /

Court Meadow

Investigation into

culvert inlet grid

arrangement and

maintenance

Short term

(0-5 years)

4days FTE

plus £5k

survey

M24, M35

H12 Works to inlets

culvert grid

Short term

(0-5 years)

£10-40k

(nominal

estimate)

M33, M34


(Revenue)

M53, M44

H14 Penhow, St Brides

Brook

Further investigation

into drainage

arrangement.

Short term

(0-5 years)

3days FTE

plus £3k

survey

M24


(Revenue)

M53, M44

Total (non-revenue) 15days FTE & £60-210k


6 6

9 9






Page 97

7.11 Liswerry Ward

7.11.1 Overview

Liswerry Ward is stretches along the coast of NCC up to the southern edge of

Central Newport. It has a population of 12,69434 and an area of 18.59km2, which

is approximately 8.6% of the total area of Newport43. The ward is mainly flat,

with limited variations in elevation, and mainly consists of industrial, residential

and commercial developments. A large proportion of the wards in the south is

rural. The Main Rivers consist of the Usk which runs down the east boundary of

the ward and Liswerry Pill Reen and Great Spytty Reen which run east to west

across the north of the ward. Some of the ward falls within the Caldicot Level

drainage district.


The available data indicates some isolated patches of low risk flooding from

ordinary watercourses. Problems may occur in isolated locations, for example due

to culvert restrictions. As many of the ordinary watercourses are culverted where




in Liswerry.

The surface water flood maps show no significant clusters of issues within

Liswerry. The area is generally low risk with some properties in the north of the

ward being at low risk of flooding. The surface water flood maps take a



blockages.

A number of surface water pumping stations operate to reduce the risk of surface

water flooding, and flooding due to tide-lock.

Historic flood information details instances of flooding due to surface water in

Liswerry which are detailed in the table below. There are also anecdotal reports of

surface water flooding in November 2011 to Rodney Parade and across the

Maindee area.This reported flood incident relates to surface water flooding where

the drainage systems cannot cope with high intensity rainfall. The reported flood

incidents may also relate to blocked gullies or drains.


Stephenson Street Highway drainage and combined sewer issue.

The table below summarises the impacts of flooding in Liswerry based on the


43 Liswerry Ward Profile (2014) Newport city council





Page 98

Table 39 – Flood Risk Map counts for Liswerry

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





11830 0 14 833




5099 0 0 196











Ramsar Sites (ha) 34.95 0.00 0.00 0.02


(ha) 706.70 0.00 0.12 8.70


(SINC) (ha) 328.58 0.00 0.16 4.98





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 99





Page 100

7.11.3 Groundwater






Stephenson Street – A high risk of surface water flooding is predicted with the

resultant ponding impacting on the highway, which provides the sole access to

an industrial estate. NCC records suggest that this is a recurring issue, with

anecdotal comments that the highway drainage discharges to the sewer

network which is prone to blockage due to the relatively shallow gradient.

Further investigation and monitoring is planned, with DCWW liaison into

sewer surface water disconnection options.

Corporation Road / Southern Distributor Road – There is a high risk of surface

water flooding of the highway (A48), ponding under the railway bridge. The

culverted Great Spytty Reen drains through the area and anecdotal comments

suggest localised flooding occurs approximately annually. The Reen is prone

to tide-lock and liaison with NRW is proposed, with ongoing monitoring.

Walsall Street / Dudley Street – There are a large number of properties with a

low risk of surface water flooding in the area. The area is at a lower level than

the adjacent Willenhall Street. This is a residual risk, with the dominant flood

risk being tidal flooding from the adjacent Main River. The area is relatively

flat and understood to be drained by the combined sewer network and

opportunities for surface water attenuation storage to hold back peak flows

should be investigated. No flooding incidents have been recorded. Liaison

with DCWW with ongoing monitoring is planned.

Corporation Street / Colston Avenue – The highway is predicted at low risk of

surface water flooding. Anecdotal comments suggest flooding has been

experienced following issues with the adjacent pumping station and screening

however the asset has been subsequently refurbished. Investigation into the

ownership and maintenance is planned, with ongoing monitoring.

Stephenson Street Industrial Estate – Whilst no significant surface water

flooding is predicted, the area drains into surface water storage ponds before

discharging to the River Usk. Investigation into the ownership and

maintenance of these structures is planned.

Thompson Avenue – There is a high risk of highway flooding predicted. The

area is served by a culvert, draining to the Liswerry Pill Reen and no historic

flooding is recorded. Investigation and monitoring of this culvert is proposed,

since it also serves a largely residential area of the adjacent Alway Ward to the

north. Maintenance of the culvert under the rear gardens of properties is

challenging. Investigation into ownership and inlet arrangement is planned.





Page 101

Traston Avenue – Whilst there is no predicted surface water flood risk,

anecdotal comments suggest the area may be prone to elevated groundwater

causing nuisance of saturated gardens. Investigation into the maintenance of

the adjacent watercourses is planned, noting that the area is prone to tidal lock

from the Great Spytty Reen. Liaison with NRW is also planned.


Table 40 – Local Flood Risk Management measures for Liswerry

Location and

Description


Cost

Strategic

Context

I1 Stephenson

Street

Investigation into highway

drainage

Short term

(0-5 years)

3days FTE

plus £2k

survey

M24,

M35

I2 Liaison with DCWW on

surface water disconnection.

Short term

(0-5 years)

5days FTE

M24,

M34

I3 Nominal improvement

works to highway drainage

Short term

(0-5 years)

£10-20k

(nominal

estimate)

M33,

M34

I4 Monitor Ongoing N/A

(Revenue)

M53,

M44

I5 Corporation

Road /

Southern

Distributor

Road

Partnership working with

NRW wrt Reen

Ongoing N/A

(Revenue)

M35


(Revenue)

M53,

M44

I7 Walsall Street /

Dudley Street


surface water disconnection.

Short term

(0-5 years)

5days FTE

M24,

M34


(Revenue)

M53,

M44

I9 Corporation

Street / Colston

Avenue

Investigate ownership/

maintenance of drainage

assets

Short term

(0-5 years)

1day FTE M33,

M34


(Revenue)

M53,

M44

I11 Stevenson

Street

Industrial

Estate

Investigate ownership/

maintenance of drainage

assets

Short term

(0-5 years)

1day FTE M33,

M34

I12 Thompson

Avenue

Investigation into culvert

ownership/maintenance, and

inlet arrangement.

Short term

(0-5 years)

5days FTE

plus £2k

survey

M24,

M35


(Revenue)

M53,

M44

I14 Traston

Avenue

Partnership working with

NRW wrt Reen

Ongoing N/A

(Revenue)

M35

I15 Investigation into

watercourse maintenance.

Short term

(0-5 years)

3days FTE M24,

M35


(Revenue)

M53,

M44


24k


6 3

6 11






Page 102

7.12 Llanwern Ward

7.12.1 Overview

Llanwern Ward is the largest ward and is situated along the southwest coast of

NCC. It has a population of 2,95234 and an area of 52.83km2, which is

approximately 24% of the total area of Newport44. Llanwern is mainly flat, apart

from a rise in elevation along the northern ward boundary. The land use within the

ward consists of a large industrial development, and arable and livestock

farmland. There are several Main Rivers in the ward; Monks’ Ditch runs through

the central west of the ward and Hundred Perches Reen runs through the central

east of the ward. Other Main Rivers include Windmill Reen, Ridings Reen and

Elver Pill Reen. Much of the ward falls within the Caldicot Level drainage

district.



from ordinary watercourses however these are only present in a few patches to the

north of the ward. Problems may also occur in isolated locations, for example due




There is one reported instance of historical flooding from ordinary watercourses:


Station Road, Llanwern Surface water flooding caused by Monks’ Ditch

overflowing natural exceedence

The surface water flood maps show three main clusters of issues around Llanwern

and Bishton in the north of the ward. They are generally of medium/high risk but

with few properties. The surface water flood maps take a generalised approach to




in Llanwern which are detailed in the table below. This reported flood incident



gullies or drains.


Bishton Rd, between Waltwood Rd and Bishton Surface Water Flooding/culvert flooding

Llanwern Village Surface Water Flooding/culvert flooding

Lanstone Lane, Lanwern Village Surface Water Flooding/culvert flooding

44 Llanwern Ward Profile (2014) Newport city council





Page 103

The table below summarises the impacts of flooding in Llanwern based on the


Table 41 – Flood Risk Map counts for Llanwern

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to 1

in 100

chance in

any year)

Low

(1 in 100

to 1 in

1000

chance in

any year)





2909 7 30 211




1254 3 8 24











Ramsar Sites (ha) 37.30 0.00 0.00 0.00


(ha) 2541.10 3.62 9.62 69.88


(SINC) (ha) 339.24 2.12 3.29 9.32





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 45.93 3.71 5.37 9.06






Page 104





Page 105

7.12.3 Groundwater






Station Road, Llanwern - Located adjacent to the Main River Monks’ Ditch, a

small number of properties and services are predicted at risk of surface water

flooding. The Llanwern Village culvert inlet grid has been identified as

‘critical’ by NCC. The Fire Service record three incidents pumping water out

from flooded properties. Historic surface water flooding incidents are recorded

by NCC, however significant desilting of surface water drainage in 2013 has

subsequently been completed. Monitoring is proposed.

Langstone Road, Llanwern – Located upstream of Station Road, recurrent

highway ponding is recorded by NCC. Investigations recently completed by

NCC identified the cause as culvert capacity restrictions due to tree roots and

a scheme is proposed to replace and upsize the culvert. A funding application

by the Community Council is ongoing and monitoring is proposed.

Waltwood Road / Birch Road, Underwood – A cluster of properties are

predicted at medium flood risk. Although no flooding is recorded by NCC,

nearby the Fire Service recorded an incident of pumping of the flooded

highway. Further investigation and monitoring is proposed.

Bishton – A number of properties are predicted at medium risk of surface

water flooding. No incidents are recorded within the village although

upstream NCC record recurring flooding of the highway between Waltwood

Road and Bishton. Additional gullies and culvert upsizing was completed by

NCC in 2014 as part of a highway enhancement scheme. Further monitoring is

planned.






Page 106

Table 42 – Local Flood Risk Management measures for Llandwern

Location and

Description


Context

J1 Station Road,

Llanwern

Monitor Ongoing N/A (Revenue) M53, M44

J2 Langstone Lane,

Llanwern

Culvert

improvement

works

Short term

(0-5 years)

(170m upsize

from 225dia to

450dia)

£30-50k

(nominal

estimate)

M33, M34

J3 Monitor Ongoing N/A (Revenue) M53, M44

J4 Waltwood Road /

Birch Road,

Underwood

Investigate

Short term

(0-5 years)

3 days FTE and

£2k survey

M24

J5 Monitor Ongoing N/A (Revenue) M53, M44

J6 Bishton Monitor Ongoing N/A (Revenue) M53, M44

Total (non-revenue) 3days FTE and £32-52k


4 1

4 2






Page 107

7.13 Malpas Ward

7.13.1 Overview

Malpas Ward is situated along the northern border of NCC, to the north of Central

Newport. It has a population of 7,84434 and an area of 2.1km2, which is

approximately 1.0% of the total area of Newport45. The ward gently slopes

southwards and consists of predominately residential housing. The Main River

Usk borders the south east of the ward for a short length.



from ordinary watercourses running down the eastern boundary of the ward.

Problems may also occur in isolated locations, for example due to culvert





in Malpas.

The surface water flood maps show two main clusters of issues around Malpas in

the centre/east of the ward adjacent to Rowan Way. There are two patches of high

risk areas here with some properties potentially affected. The surface water flood

maps take a generalised approach to the representation of drainage systems



Historic flood information details four instances of flooding due to surface water

in Malpas which are detailed in the table below. These reported flood incidents

relate to surface water flooding where the drainage systems cannot cope with high


or drains.


Larch Grove, Malpas Surface Water Flooding (Flash Flood)

Almond Drive, Malpas Surface Water Flooding (Flash Flood)

Llanover Close, Malpas Surface Water Flooding (Flash Flood)

Wavell Drive, Malpas Surface Water Flooding (Flash Flood)/culvert

flooding

The table below summarises the impacts of flooding in Malpas based on the


45 Malpas Ward Profile (2014) Newport city council





Page 108

Table 43 – Flood Risk Map counts for Malpas

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





7939 12 46 295




3422 3 9 44











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 3.41 0.00 0.00 0.00


(SINC) (ha) 12.37 0.68 1.22 1.93





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 109





Page 110

7.13.3 Groundwater






Larch Grove / Pilton Vale – Two clusters of properties are predicted at high

risk of surface water flooding. Surface water flooding is recorded to eight

properties and the Fire Service record pumping of flood water from the

highway and properties. Anecdotal comments suggest this is on the alignment

of a historic stream and ponding risk is exacerbated by a former railway

embankment downstream. Some property sewer flooding incidents are

recorded, but the sewerage is recorded as a separate foul and storm system. To

the north, the site of a historic spring causes intermittent land drainage issues

and NCC have historically constructed an interception trench to divert flows

away from properties. Discussions into the ownership of the surface water

sewerage are ongoing. Investigation to reduce the risk of overland flow

ponding behind the embankment, monitoring and liaison with DCWW is

proposed.

Almond Drive / Japonica Close – Surface water flooding is predicted to a

small number of properties, with ponding upstream of the former railway

embankment. NCC are working to reduce the risk of surface water runoff

from Malpas Park Primary school and modest attenuation works are proposed

to hold back peak flows, with further monitoring.

Larch Court / Larch Grove – A small number of properties and the highway

are predicted at medium risk of surface water flooding. Anecdotal comments

are that there has been recent carriageway flooding and liaison with the

(unadopted) highway owner is proposed to progress improvements to highway

drainage, with ongoing monitoring.

Horrocks Close – A small number of properties are predicted at low risk of

surface water flooding along the line of an historic watercourse. Some

property sewer flooding incidents are recorded, but the sewerage is recorded

as a separate foul and storm system. Liaison with DCWW and ongoing

monitoring is proposed.

Malpas Road North, Alanbrooke Avenue – Whilst no surface water flooding

to property is predicted, anecdotal comments suggest that highway drainage

risk to property has been experienced. Works to address maintenance issues

with storm drainage and monitoring are proposed.

Graig Park Road – A cluster of properties are predicted at risk of surface water

flooding. NCC recently replaced the surface water culvert but the area is in a

topographic depression and ongoing monitoring is planned.





Page 111


Table 44 – Local Flood Risk Management measures for Malpas

Location and

Description


Cost

Strategic

Context

K1 Larch Grove /

Pilton Vale

Investigation into

ownership of

sewerage.

Short term

(0-5 years)

3 days FTE

and £1k

survey

M53, M44

K2 Investigate risk and

mitigation of

ponding.

Short term

(0-5 years)

3 days FTE

and £2k

survey

M24

K3 Liaison with

DCWW.

Ongoing N/A

(Revenue)

M53, M44

K4 Monitor Ongoing N/A

(Revenue)

M53, M44

K5 Almond Drive /

Japonica Close

Works to address

surface water

runoff.

Short term

(0-5 years)

£10k nominal

estimate

M24


(Revenue)

M53, M44

K7 Larch Court /

Larch Grove

Liaison with

highway drainage

owner

Short term

(0-5 years)

1day FTE M24


(Revenue)

M53, M44

K9 Horrocks Close Liaison with

DCWW.

Ongoing N/A

(Revenue)

M53, M44


(Revenue)

M53, M44

K11 Malpas Road /

Alanbrooke

Avenue

Drainage

improvement works

Short term

(0-5 years)

£10-15k

(nominal

estimate)

M24


(Revenue)

M53, M44

K13 Graig Park Road Monitor Ongoing N/A

(Revenue)

M53, M44



9 4

9 0






Page 112

7.14 Marshfield Ward

7.14.1 Overview

Marshfield Ward is situated along the coast and the edge of the western border of

NCC, to the south-west of Central Newport. It has a population of 6,30334 and an

area of 44.81km2, which is approximately 20.6% of the total area of Newport46.

The ward gently slopes north to south, onto the valley plain, which consists of

livestock and arable farmland. There is some industrial development to the north-

east of the ward.

Main rivers include Drenewydd Reen, Broadway Reen, Rhosog Fawr Reen,

Tarwick Reen, Hawse Reen, Wharf Reen, Newgout Pill, Pont-y-cw cw, Gout

Fawr Pill and the Ebbw River. Much of the ward is within the Wentlooge Level

drainage district.


The available data indicates some limited areas of low risk flooding from ordinary

watercourses with one larger low to medium risk area in the centre of the ward

near Coedkernew. Higher risk flooding problems may also occur in isolated




watercourses.

There are two reported instances of historical flooding from ordinary watercourses

in Marshfield which are detailed in the table below:


St Alban's Cottage, St Mellon's

Road

Surface water flooding, natural exceedence from

ordinary watercourse

Woodside, Duffryn Surface water flooding caused by Tredegar Reen

overflowing, natural exceedence from ordinary

watercourse

The surface water flood maps show three main clusters of issues spread

throughout the central belt of the ward at Marshfield, Imperial Park and Duffryn

Drive. Most of these areas are low risk associated with the watercourses and

reens. The surface water flood maps take a generalised approach to the




Marshfield which is detailed in the table below. These reported flood incidents

relate to surface water flooding where the drainage systems cannot cope with high


or drains.

46 Marshfield Ward Profile (2014) Newport city council





Page 113


Nantymor Cottages,

Coedkernew

Surface Water Flooding (Flash Flood)

The table below summarises the impacts of flooding in Marshfield based on the


Table 45 – Flood Risk Map counts for Marshfield.

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100

to 1 in

1000

chance in

any year)





5928 12 16 135




2555 4 5 32











Ramsar Sites (ha) 117.63 0.00 0.03 0.17


(ha) 1882.25 8.82 23.45 132.77


(SINC) (ha) 25.38 0.24 0.47 1.39





Country Parks (ha) 34.04 0.17 0.55 4.07




Guidance (ha) 54.31 0.07 0.27 0.85






Page 114





Page 115

7.14.3 Groundwater



There are 71 reported instances of DG5 sewer flooding in this ward. The majority

of these are in a cluster to the south west of the ward.



Marshfield – The highway and a small number of properties are predicted at

medium/low risk of surface water flooding throughout the community. An

incident of surface water flooding is recorded. The highway has been re-

profiled at Cambrian Way to divert overland flow. Property sewer flooding is

also recorded and anecdotal comments suggest that highway drainage

connects to the shallow sewer network. The drainage network is prone to

siltation and an enhanced regime of planned desilting is proposed, with liaison

with NRW and DCWW, and ongoing monitoring.

Blacksmiths Way / Nant-y-moor – Properties and the highway (A48) are

predicted at high risk of surface water flooding. Property flooding due to

surface water is recorded and the Fire Service have recorded two incidents of

pumping out flood water from property. Two culverts drain into the

Nanymoor Reen and investigation into its ownership and maintenance is

proposed. The culverts are maintained by riparian owners and liaison is

proposed. Upstream the catchment is rural and relatively small and so

investigation into catchment management is also planned, with ongoing

monitoring.

Jamaica Close / Dyffryn Drive / Woodside Estate (see also Section 7.21.5,

Tredegar Ward) – A large number of properties are predicted at low risk of

surface water flooding. An incident of surface water flooding is recorded at

Woodside, attributed to the capacity of the ordinary watercourse. The location

is immediately downstream of Tredegar Park Lake reservoir which is

culverted to discharge into Tredegar Reen. Investigation into the maintenance

of the culvert and reen is planned, with ongoing monitoring. The Tredegar

Reen, Duffryn culvert inlet grid has been identified as ‘critical’ by NCC.

Pound Hill / A48 – The highway (A48) is predicted at low risk of surface

water flooding. Whilst the adjacent M4 drainage manages much of the risk,

anecdotal comments suggest land drainage or groundwater flooding of the

highway is not uncommon. Further investigation and monitoring is planned.





Page 116


Table 46 – Local Flood Risk Management measures for Marshfield

Location and

Description


Cost

Strategic

Context

L1 Marshfield Enhanced drainage

desilting.


L2 Liaison with

DCWW and NRW

Ongoing N/A (Revenue) M53, M44

L3 Monitoring Ongoing N/A (Revenue) M53, M44

L4 Blacksmiths Way

/ Nant-y-moor

Liaison with

riparian owners

Short term

(0-5 years)

1day FTE M24, M43

L5 Investigation into

upstream catchment

management

Short term

(0-5 years)

10days FTE

plus £8k survey

allowance

M24, M35


L7 Jamaica Close /

Dyffryn Drive /

Woodside

Investigate culvert

and reen

maintenance / inlet

Short term

(0-5 years)

4days FTE plus

£2k survey

M24, M35


L9 Pound Hill / A48 Investigate land

drainage and

ground water issue

Short term

(0-5 years)

4days FTE plus

£8k survey

allowance

M24, M35




5 4

6 4






Page 117

7.15 Pillgwenlly Ward

7.15.1 Overview

Pillgwenlly Ward is situated in the central part of NCC, to the immediate south of

Central Newport. It has a population of 7,49034 and an area of 6.43km2, which is

approximately 2.96% of the total area of Newport47. The ward is flat and contains

industrial, commercial and some residential properties. Alexandra Docks is

located to the south of the ward. The main River Ebbw flows along the boundary

of the ward, to the south-west and the Usk to the east.


The available data indicates that limited areas of low risk flooding from ordinary

watercourses. Problems may occur in isolated locations, for example due to





in Pillgwenlly.

The surface water flood maps show isolated areas of low risk flooding with one a

few small areas of high risk flooing. The main areas of properties affected is in the

north of the ward in the vicinity of the Enterprise Park and is low risk only. The







Pillgwenlly which is detailed in the table below. This reported flood incident

relates to a storm water pumping station.


Docks Way, under Rail Bridge,

Maesglas

Storm pumping station issue

The table below summarises the impacts of flooding in Pillgwennlly based on the


47 Pillgwenlly Ward Profile (2014) Newport city council





Page 118

Table 47 – Flood Risk Map counts for Pillgwenlly

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100

to 1 in

1000

chance in

any year)





7303 9 114 1206




3148 4 20 355











Ramsar Sites (ha) 0.25 0.00 0.00 0.00


(ha) 84.12 0.00 0.02 0.12


(SINC) (ha) 8.26 0.02 0.29 0.39





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 119





Page 120

7.15.3 Groundwater






Usk Way / Docks Way – The highway is predicted at high risk of surface

water flooding. The partially-culverted Twenty-Acres Reen drains the area

and a significant upstream development. Further investigation into the

maintenance and operation of the highway drainage and reen is proposed, with

ongoing monitoring.

Commercial Road / Ruperra Street / Potter Street / New Street / Church Street

/ Pottery Road / Baldwin Street – A large number of properties, essential

services and highways are predicted at low/medium risk of surface water

flooding throughout much of the east of the ward. The Fire Service recorded

13 incidents of pumping flood water from property and the highway. The area

is largely drained by the combined sewer network, which discharges into an

interceptor tunnel and so avoids tide lock. The drainage network is prone to

blockage and siltation due to the typical shallow gradients. Liaison with

DCWW is proposed to better understand the performance of the drainage

network, a review of silt management and ongoing monitoring.


Table 48 – Local Flood Risk Management measures for Pillgwenlly

Location and

Description


Cost

Strategic

Context

M1 Usk Way /

Docks Way

Investigate highway

drainage and reen

maintenance and

operation

Short term

(0-5 years)

4days FTE

plus £2k

survey

M24, M35

M2 Monitoring Ongoing N/A

(Revenue)

M53, M44

M3 Commercial

Road

Review of silt

management

Short term

(0-5 years)

6days FTE

plus £5k

survey

M24, M35

M4 Liaison with DCWW Ongoing N/A

(Revenue)

M53, M44

M5 Monitoring Ongoing N/A

(Revenue)

M53, M44



3 2

3 2






Page 121

7.16 Ringland Ward

7.16.1 Overview

Ringland Ward is situated in the central part of NCC, to the east of Central

Newport. It has a population of 8,47834 and an area of 2.44km2, which is

approximately 1.12% of the total area of Newport48. The ward is relatively flat,

slightly sloping north to south, and contains a high concentration of residential

properties.

There are no Main Rivers in Ringland.


The available data indicates some areas of high risk flooding from ordinary

watercourses in the south of the ward. Higher risk flooding problems may also

occur in isolated locations, for example due to culvert restrictions. As many of the

ordinary watercourses are culverted where they pass through developed areas it is

difficult to distinguish between surface water flooding and flooding from ordinary

watercourses.


in Ringland which is detailed in the table below.


Llanwern Road Ordinary watercourses blockage or natural flood

The surface water flood maps show three main clusters of issues spread

throughout the ward; near Ringland Way roundabout in the south, by Handel

Close in the east and Howe Circle in the north. There are larger patches of high

risk flooding in the vicinity of Handel Close and Ringland Way, with Howe Circle

in the north being a lower risk. The surface water flood maps take a generalised




Ringland which is detailed in the table below. This reported flood incident relates

to surface water flooding, it may relate to where the drainage systems cannot cope

with high intensity rainfall or to blocked gullies or drains.


Anson Green Surface water flooding

The table below summarises the impacts of flooding in Ringland based on the


48 Ringland Ward Profile (2014) Newport city council





Page 122

Table 49 – Flood Risk Map counts for Ringland

Totals in

Defined Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





8837 70 202 872




3809 20 43 182











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 0.00 0.00 0.00 0.00


(SINC) (ha) 13.15 1.06 2.23 2.88





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 123





Page 124

7.16.3 Groundwater






Ringland Way – A large number of properties are predicted at low/medium

risk of surface water flooding and the highway (A48) at high risk. The issue is

linked to the adjacent upstream Ringland Circle/Stanford Road (see Section

7.4.5, Alway Ward). No historic incidents of surface water flooding are

recorded. The area is drained by a partially culverted ordinary watercourse

which discharges into Liswerry Pill Reen and the Drainage District. The

adjacent Hartridge Farm surface water lagoon is over 3ha in size and

anecdotal comments suggest maintenance is required to reduce upstream flood

risk. The area, also known as Ringland Way Marsh, is designated as an SINC

however there is thought to be extensive invasive species present and limited

amenity value with no formalised public access. Investigation to optimise the

management of the site and monitoring is proposed.

Playford Crescent – A large number of properties and the highway are

predicted at medium/high risk of surface water flooding. No historic incidents

of surface water flooding are recorded. Further investigation into the culvert

inlets and monitoring is proposed.

Cunningham Road / Anson Green – A number of properties are predicted at

medium risk of surface water flooding. The highway is predicted at high risk

of surface water ponding. A surface water flooding incident is recorded at

Anson Green and immediately downstream at Llanwern Road due to blockage

or exceedance of the ordinary watercourse. The area is served by a partially-

culverted ordinary watercourse. Some property sewer flooding is recorded but

the area is understood to be served by a separate foul and storm sewer

network. Further investigation into the culvert capacity and the four inlet grids

is planned, with ongoing monitoring. Upstream woodland may present

opportunities for attenuation storage to hold back peak flows.

Bishpool Avenue – A small number of properties are predicted at medium/low

risk of surface water along the alignment of an historic watercourse. No

historic flooding incidents are recorded. The area is drained by a partially

culverted watercourse. Investigation in to the culvert inlet grids and ongoing

monitoring is proposed. Opportunities to attenuate flows will be explored in

the ‘North of Ringland Circle’ open space, linked to Ringland Circle/Stanford

Road downstream (see Section 7.4.5, Alway Ward).





Page 125

Coldra – The A229 / A48 / M4 roundabout is predicted at high risk of surface

water flooding. Flows from the upstream Coldra Wood are culverted – links to

Blossom Close (see Section 7.10.5, Langstone Ward). Monitoring is proposed.


Table 50 – Local Flood Risk Management measures for Ringland

Location and

Description


Cost

Strategic

Context

N1 Ringland Way Investigate downstream

lagoon maintenance/

operation

responsibilities.

Short term

(0-5 years)

3days FTE M24

N2 Lagoon enhancements Short term

(0-5 years)

£10-40k

nominal

estimate

M33, M34

N3 Monitoring Ongoing N/A

(Revenue)

M53, M44

N4 Playford

Crescent

Culvert inlet

investigation

Short term

(0-5 years)

3 days FTE

and £2k

survey

M24


(Revenue)

M53, M44

N6 Cunningham

Road / Anson

Green

Culvert inlet (4xgrids)

investigation

Short term

(0-5 years)

5 days FTE

and £5k

survey

M24


(Revenue)

M53, M44

N8 Bishpool

Avenue

Culvert inlet

investigation

Short term

(0-5 years)

3 days FTE

and £2k

survey

M24

N9 Investigation into

upstream attenuation

and catchment

restoration

Short term

(0-5 years)

5days FTE M24, M31


(Revenue)

M53, M44

N11 Coldra Monitoring Ongoing N/A

(Revenue)

M53, M44



5 5

5 3






Page 126

7.17 Rogerstone Ward

7.17.1 Overview

Rogerstone Ward is situated along the northern border of NCC, to the north-west

of Central Newport. It has a population of 10,11534 and an area of 8.66km2, which

is approximately 4.0% of the total area of Newport49. The ward steeply slopes

down to the valley floor which consists of predominantly residential properties,

with some areas of commercial uses. The landuse of the hillslope is livestock and

arable farmland.

The Main River Ebbw borders the west of the ward.


The available data indicates that limited areas of low risk flooding from ordinary

watercourses. Problems may occur in isolated locations, for example due to





in Rogerstone which is detailed in the table below.


The Uplands, Rogerstone Surface water flooding from natural exceedence

or ordinary watercourse

There are three main clusters of surface water flooding in Rogerstone in the west

of the ward at Rogerstone Station/Oak Tree Drive, Wern Industrial Estate and

near Myrtle Drive/Pye Corner. Although generally low risk there are areas of

medium/high risk in these areas. The surface water flood maps take a generalised




in Rogerstone which is detailed in the table below. This reported flood incident

relates to surface water flooding, it may also relate to where the drainage systems

cannot cope with high intensity rainfall or to blocked gullies or drains.


The Uplands, Rogerstone Surface Water Flooding (Flash Flood)/culvert

flooding

Pye Corner, Rogerstone Surface Water Flooding/culvert flooding

The table below summarises the impacts of flooding in Rogerstone based on the


49 Rogerstone Ward Profile (2014) Newport city council





Page 127

Table 51 – Flood Risk Map counts for Rogerstone

Totals in

Defined

Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





10066 16 118 810




4339 5 18 131











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 0.00 0.00 0.00 0.00


(SINC) (ha) 130.23 8.03 11.37 15.84





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 128





Page 129

7.17.3 Groundwater






The Uplands / Wern Industrial Estate – A medium/high risk of surface water

flooding is predicted to the highways and a number of services/industrial

areas. There are historic surface water flooding incidents recorded with some

property flooding. Maintenance by NCC in 2013 cleared silt, debris and roots

in the surface water culvert. The sewer network in this area is understood to be

a mix of combined and separate. There are anecdotal comments that the

surface water network manhole benching is in a poor condition and increases

the risk of blockages. A scheme is proposed to address this issue. Further

investigation into culvert/surface water drainage capacity and monitoring is

planned, along with liaison with DCWW on surface water disconnection

opportunities.

Myrtle Drive – A large number of properties are predicted at low/medium risk

of surface water flooding. The sewer network in this area is generally separate.

No surface flooding incidents are recorded. The area is served by a culvert

running under the A467 highway embankment and discharging to the Ebbw

River. Further investigation into the inlet arrangement and monitoring is

recommended.

Rogerstone Station/Oak Tree Drive – there are some areas of predicted surface

water ponding. The sewer network in this area is generally separate, further

investigation into the drainage arrangement and monitoring is recommended.





Page 130


Table 52 – Local Flood Risk Management measures for Rogerstone

Location and

Description


Cost

Strategic

Context

O1 Uplands/Wern

Industrial Estate

Improve flow

conveyance by re-

benching manhole

Short term

(0-5 years)

£10-15k M33

O2 Investigation into

storm drainage

capacity

Short term

(0-5 years)

3days FTE

plus £2k

survey

M24

O3 Monitor Ongoing N/A

(Revenue)

M53, M44

O4 Myrtle Drive/Pye

Corner

Investigate drainage

arrangement

Short term

(0-5 years)

2days FTE

plus £2k

survey

M24

O5 Monitor Ongoing N/A

(Revenue)

M53, M44

O6 Rogerstone

Station/Oak Tree

Drive

Investigation into

drainage

arrangement

Short term

(0-5 years)

3days FTE

plus £2k

survey

M24

07 Monitor Ongoing N/A

(Revenue)

M53, M44

Total (non-revenue) 8days FTE plus £16-21k


3 3

3 1






Page 131

7.18 Shaftesbury Ward

7.18.1 Overview

Shaftesbury Ward is situated in the central part of NCC, to the immediate north of


approximately 0.8% of the total area of Newport50. Shaftesbury is a relatively flat

ward with a gentle slope from north to south, while bordering the River Usk to the

east. The ward consists of industrial, residential and commercial buildings.


The available data indicates that limited areas of low risk flooding associated with






in Shaftesbury which is detailed in the table below.


Goodrich Crescent and

surrounding areas

Intense rainfall during October 2000 causing

ordinary watercourse flooding

There is one main area of surface water flooding in Shaftesbury in the central west

of the ward near Malpas Road and Malpas Lane. Although generally low risk

there are areas of medium/high risk which could affect properties. The surface

water flood maps take a generalised approach to the representation of drainage

systems however the mapping is indicative of areas most affected during high

intensity storms or due to blockages.


Shaftesbury which is detailed in the table below. This reported flood incident



gullies or drains.


Bryn Bevan, Shaftesbury Surface Water Flooding (Flash Flood)

The table below summarises the impacts of flooding in Shaftesbury based on the


50 Shaftesbury Ward Profile (2014) Newport city council





Page 132

Table 53 – Flood Risk Map counts for Shaftesbury

Totals in

Defined

Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





5710 26 88 677




2461 7 22 196











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 10.80 0.00 0.00 0.00


(SINC) (ha) 13.43 0.27 0.40 0.63





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 133





Page 134

7.18.3 Groundwater






Kimberly Terrace / Malpas Road – A number of properties are predicted at

medium risk of surface water. There are anecdotal comments of historic

property flooding and the Fire Service attended an incident to pump out

floodwater in this area. The sewer system is understood to be a separate

foul storm system upstream of the M4 but is understood to drain into a

combined system to the south. NCC consider the Malpas M4 Roundabout

surface water pumping station as ‘high risk’ and have telemetry installed.

Some sewer property flooding is recorded. Liaison with DCWW is

recommended to investigate surface water disconnection opportunities.

Investigation into the culvert inlet arrangement and maintenance

responsibilities are also proposed, with ongoing monitoring.

Llanover Close / Malpas Road - A small number of properties are

predicted at medium risk of surface water. Surface water flooding of

property gardens is recorded in Llanover Close. The area is immediately

downstream of Graig Park Road (See Section 7.13.5, Malpas Ward) and

drained by a culvert to Malpas Brook. Further investigation into the

culvert inlet arrangement is proposed, with ongoing monitoring.

Pant Road - A number of properties are predicted at low/medium risk of

surface water. No historic surface water property flooding is recorded

however there are anecdotal comments of garden flooding. Investigation

into the ownership and maintenance of a culvert is planned. The area is

drained by a combined network and some sewer property flooding is

recorded. Liaison with DCWW is recommended to investigate surface

water disconnection opportunities.

Bryn Bevan – A small cluster of properties is predicted at medium risk of

surface water flooding. Historic surface water flooding of a property is

recorded. The area is understood to be drained by a separate foul and

storm sewerage network and investigation into localised improvements to

the highway drainage in the topographic depression are proposed with

ongoing monitoring.

Agincourt Street / Argyle Street – Properties are predicted at medium risk

of flooding. Whilst no historic surface water property flooding is recorded,

the Fire Service have attended to pump flooding of the highway. The area

comprises a mixture of residential and industrial properties and is adjacent

to Crindau Pill. Investigation into the surface water drainage system





Page 135

arrangement is proposed, including the condition of tidal outfalls. NRW

are currently implementing a main river flood risk management scheme

and opportunities for surface water flood risk betterment through

partnership working will be proposed with ongoing monitoring.

Hoskins Street / Wheeler Street – A number of properties are predicted at

low/medium risk of surface water flooding. Whilst no historic surface

water property flooding is recorded, the Fire Service have attended to

pump a flooded property. As above, investigation into the surface water

drainage system is proposed, seeking opportunities for surface water flood

risk betterment through partnership working with NRW and ongoing

monitoring.

Old Green North – The surface water pumping station has been closed.

Investigation and subsequent decommissioning is proposed should it be

redundant.

Goodrich Crescent – A small number of properties are predicted at low

risk of surface water flooding. Historic flooding is recorded, attributed to

main river sources. Property sewer flooding in the area is also recorded.

Ongoing monitoring is planned.

Harlequin Drive – A number of properties are predicted at low/medium

risk of surface water flooding however no historic flooding is recorded.

Ongoing monitoring is planned with investigation of the upstream culvert

inlet arrangement and maintenance. There may be enhancement

opportunities linked to the upstream Barrack Hill SINC.






Page 136

Table 54 – Local Flood Risk Management measures for Shaftesbury

Location and

Description


Cost

Strategic

Context

P1 Kimberly

Terrace /

Malpas Road


surface water disconnection

opportunities

Ongoing N/A

(Revenue)

M24,

M35

P2 Liaison with riparian owners

regarding

maintenance/operation

responsibilities.

Short term

(0-5years)

2days FTE M24,

M43

P3 Monitor Ongoing N/A

(Revenue)

M53,

M44

P4 Llanover

Close /

Malpas Road

Investigation into culvert

inlet arrangement

Short term

(0-5years)

3days FTE

plus £2k

survey

M24


(Revenue)

M53,

M44

P6 Pant Road Liaison with DCWW on

surface water disconnection

opportunities

Ongoing N/A

(Revenue)

M24,

M35


(Revenue)

M53,

M44

P8 Bryn Bevan Investigation into localised

highway drainage

improvements

Short term

(0-5years)

1day FTE M24

P9 localised highway drainage

improvements

Short term

(0-5years)

£5-10k M33


(Revenue)

M53,

M44

P11 Agincourt

Street /

Argyle Street

Investigation into surface

water drainage condition

Short term

(0-5years)

3days FTE

plus £2k

survey

M24

P12 Partnership working with

NRW on surface water

betterment

Ongoing N/A

(Revenue)

M35


(Revenue)

M53,

M44

P14 Hoskins Street

/ Wheeler

Street

Investigation into surface

water drainage condition

Short term

(0-5years)

2days FTE

plus £2k

survey

M24

P15 Partnership working with

NRW on surface water

betterment

Ongoing N/A

(Revenue)

M35


(Revenue)

M53,

M44

P17 Old Green

North

Investigation into

decommissioning

Short term

(0-5years)

2days FTE M24

P18 Goodrich

Crescent

Monitor Ongoing N/A

(Revenue)

M53,

M44

Total (non-revenue) 13days FTE plus £11-

16k


6 7

7 5






Page 137

7.19 St Julians Ward

7.19.1 Overview

St. Julians Ward is situated in the central part of NCC, to the immediate north-east

of Central Newport. It has a population of 8,71434 and an area of 2.18km2, which

is approximately 1.0% of the total area of Newport51. St Julians borders the River

Usk to the west and north. The ward gently slopes down, from east to west, and is

heavily concentrated with mainly residential, and a few industrial developments.


The available data indicates that limited areas of low risk flooding associated with






in St Julians which is detailed in the table below:


Orchard Street Surface water flooding caused by Lotteries Reen

overflowing, natural exceedence of ordinary

watercourses

There are two main clusters of surface water flooding in St Julians, one in the

central area of the ward around of the ward around Rockfield Street, and the other

area to the north on the M4. There are areas of medium/high risk within these

areas which could affect properties or the major road network. The surface water

flood maps take a generalised approach to the representation of drainage systems




in St Julians which is detailed in the table below. These reported flood incidents



gullies or drains.


Caerleon Road, St Julians Surface Water Flooding (Flash Flood)

Orchard Street, St Julians Surface Water Flooding (Flash Flood)/culvert

flooding

Bank Street Surface water flooding caused by hydraulic

overload

The table below summarises the impacts of flooding in St Julians based on the


51 St. Julians Ward Profile (2014) Newport city council





Page 138

Table 55 – Flood Risk Map counts for St Julians

Totals in

Defined

Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





8793 58 181 1179




3790 11 62 357











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 28.83 0.00 0.00 0.01


(SINC) (ha) 38.22 0.03 0.14 1.31





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 139





Page 140

7.19.3 Groundwater






Stafford Road / Orchard Street / Bank Street / Margaret Avenue – A large

number of properties are predicted at high/medium risk of surface water

flooding. Historic surface water flooding of properties is recorded in

Orchard Street, Bank Street and Caerleon Road. The Fire Service recorded

incidents pumping out flooded highway and property. Some sewer

property flooding is recorded in the area. The sewer network is combined

and so there are potential opportunities for surface water disconnection

through liaison with DCWW. Investigation into the arrangement,

condition and capacity of the surface water partially-culverted watercourse

and inlet grids which drains the area, running through open space to the

rear of St Anne’s Crescent and discharging under the railway to the River

Usk is proposed. Upstream opportunities for attenuation storage to hold

back peak flows will be explored. Anecdotal comments suggest the

downstream Lotteries Reen has maintenance and siltation issues. Ongoing

monitoring is also proposed.

Clippers Close – Surface water flooding is predicted to the highway. To

the rear of properties, a culverted watercourse is shown to be the site of

ponding. The Fire Service record minor flooding incident. Investigation of

the capacity, ownership and maintenance of the culvert is proposed, noting

access is restricted, with ongoing monitoring.

M4 Junction 25 – Surface water flooding is predicted to the highway.

Liaison with SWTRA is proposed to ensure their maintenance and

resilience planning considers the residual risk should existing drainage

fail, with ongoing monitoring.





Page 141


Table 56 – Local Flood Risk Management measures for St Julians

Location and

Description


Cost

Strategic

Context

Q1 Stafford

Road/Orchard

Street / Bank Street

/ Margaret Avenue

Investigate drainage

arrangement,

maintenance

responsibilities and

capacity

Short term

(0-5years)

15days FTE

and £5k

survey

M24, M34

Q2 Investigate culvert

inlet screen and

capacity at Lotteries

Reen

Short term

(0-5years)

3days FTE

and £3k

survey

M24, M34

Q3 Liaison with DCWW

on surface water

disconnection

opportunities

Short term

(0-5years)

N/A

(revenue)

M24, M34

Q4 Monitor Ongoing N/A

(revenue)

M53, M44

Q5 Clippers Close Investigation of

culvert capacity,

ownership and

maintenance.

Short term

(0-5years)

4days FTE

and £3k

surveys

M24, M34


(revenue)

M53, M44

Q9 M4 Junction 25 Liaison with SWTRA 1day FTE M35


(revenue)

M53, M44

Total (non-revenue) 23days FTE plus £11k


3 4

3 5






Page 142

7.20 Stow Hill Ward

7.20.1 Overview

Stow Hill Ward is situated in the central part of NCC, covering a central area of


approximately 0.6% of the total area of Newport52. Stow Hill has a small area of

raised elevation in the centre of the ward. The ward borders the River Usk to the

east, and mainly consists of residential, commercial and industrial developments.


The available data indicates that there are minimal areas of low risk flooding

associated with ordinary watercourses. Problems may occur in isolated locations,

for example due to culvert restrictions. As many of the ordinary watercourses are

culverted where they pass through developed areas it is difficult to distinguish

between surface water flooding and flooding from ordinary watercourses.


in Stow Hill which is detailed in the table below


Newport City Centre Intense rainstorm during July 1997 caused

extensive surface water flooding in and around

Newport centre. Natural exceedence and flash

flood

There is one main area of surface water flooding in Stow Hill in the north of the

ward near Cambrian Road. This area shows mainly medium and high risk with

some properties and roads affected. The surface water flood maps take a



blockages.




Stow Hill which is detailed in the table below. This reported flood incident relates

to a storm pumping station issue. There may be other areas of flooding where the

drainage systems cannot cope with high intensity rainfall, or due to blocked

gullies or drains.


Kingsway, under Old Green,

Stow Hill

Storm pumping station issue

The table below summarises the impacts of flooding in Stow Hill based on the


52 Stow Hill Ward Profile (2014) Newport city council





Page 143

Table 57 – Flood Risk Map counts for Stow Hill

Totals in

Defined

Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





5596 28 121 422




2412 6 27 84











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 7.07 0.00 0.00 0.00


(SINC) (ha) 0.00 0.00 0.00 0.00





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 144





Page 145

7.20.3 Groundwater






Queensway / High Street / Cambrian Road / Skinner Street– A number of

properties and highways are predicted at high/medium risk of surface

water flooding in this area. Some property sewer flooding is recorded

locally and the highway is understood to drain to the combined sewer.

Surface water flooding is recorded during an intense rainstorm. The Fire

Service have recorded incidents in the area pumping surface water from

the highway and properties. Investigation into the drainage arrangement

and capacity is ongoing and linked to the redevelopment downstream, with

liaison with DCWW to identify any surface water disconnection

opportunities and monitoring proposed.

Kingsway / Usk Road – The highway underpass (A4042) is predicted at

high risk of surface water flooding. Surface water flooding incidents are

recorded occasionally, linked to operational issues with the Old Green

South storm pumping station. NCC identify the Old Green South storm

pumping station as ‘high risk’ and telemetry is installed. Refurbishment is

ongoing as part of the redevelopment of the area. It is likely that enhanced

highway drainage maintenance will be recommended. Ongoing monitoring

is proposed.

Gaer Street / Cardiff Road – A number of properties and the highway are

predicted at high/medium risk of surface water flooding. No flooding

incidents are recorded. Anecdotal comments suggest that the carriageway

drainage arrangement of a private estate should be reviewed to reduce the

risk of highway ponding. Ongoing monitoring is proposed.

Friars Field – Surface water flooding is predicted adjacent to the hospital.

Although no surface water flooding is recorded by NCC, the Fire Service

have recorded an incident of pumping flooded highways. Investigation

into the drainage arrangement, capacity and exceedance pathways is

proposed with ongoing monitoring.

Cardiff Road / Kingsway – A small number of properties and the highway

are predicted at risk of surface water flooding. The issue is linked and

considered as part of Commercial Road, Pillgwenlly (see Section 7.15.2).





Page 146


Table 58 – Local Flood Risk Management measures for Stow Hill

Location and

Description


Cost

Strategic

Context

R1 Queensway / High

Street / Cambrian

Road / Skinner

Street

Investigation into

drainage arrangement

including connection

to combined sewer.

Ongoing 10days FTE

and £8k

survey

M24

R2 Liaison with DCWW

on surface water

disconnection

opportunities

Short term

(0-5years)

N/A

(revenue)

M24, M35

R3 Monitoring Ongoing N/A

(revenue)

M53, M44

R4 Kingsway Surface water

pumping station

refurbishment

Ongoing N/A

(developer)

M24, M35


(revenue)

M53, M44

R6 Gaer Street /

Cardiff Road

Review private

highway drainage

arrangement

Short term

(0-5years)

3days FTE

and £2k

survey

M24, M35


(revenue)

M53, M44

R8 Friars Field Investigation into

drainage arrangement,

capacity and

exceedance pathways.

Short term

(0-5years)

10days FTE

and £2k

survey

M24, M35

R9 Enhanced highway

drainage maintenance

Short term

(0-5years)

N/A

(revenue)

M35


(revenue)

M53, M44

Total (non-revenue) 23days FTE & £12k


3 5

4 5






Page 147

7.21 Tredegar Park Ward

7.21.1 Overview

Tredegar Park Ward is situated in the central part of NCC, to the south-west of


approximately 0.8% of the total area of Newport53. Tredegar Park Ward is

relatively flat. It is comprised of residential properties, with several open green

spaces, and an industrial park to the south-west. The Main River Ebbw borders it

in the north and the Main River Pontygwew Reen flows through the north and east

of the ward.

Much of the ward is within the Wentlooge Level drainage district.


The available data indicates that there are also some areas of low risk flooding

associated with ordinary watercourses. Problems may occur in isolated locations,

for example due to culvert restrictions. As many of the ordinary watercourses are




in Tredegar Park.

There are three clusters of issues related to surface water flooding in Tredegar

Park however they are generally low risk with small areas of medium and high

risk. The surface water flood maps take a generalised approach to the





There are no reported instances of flooding due to surface water in Tredegar Park.

53 Tredegar Park Ward Profile (2014) Newport city council





Page 148

The table below summarises the impacts of flooding in Tredegar Park based on

the Surface Water Flood map, shown below.

Table 59 – Flood Risk Map counts for Tredegar Park

Totals in

Defined

Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)


depth >0.0m



4487 0 0 724




1934 0 0 148











Ramsar Sites (ha) 0.00 0.00 0.00 0.00



(SINC) (ha) 2.48 1.09 1.33 1.60





Country Parks (ha) 0.90 0.00 0.01 0.12




Guidance (ha) 0.00 0.00 0.00 0.00






Page 149





Page 150

7.21.3 Groundwater



There is one reported instance of DG5 sewer flooding in this ward.



Woodside Estate – a number of properties are predicted at low risk of surface

water flooding however no surface water flooding has been recorded.

Anecdotal comments suggest that there have been issues with fly tipping on

Tredegar Reen causing partial blockages. Liaison with the adjacent school and

community is proposed to explore opportunities for supportive local

monitoring and enhancement of the adjacent open space of centre of Duffryn

Estate, with ongoing monitoring by NCC. The issue is linked to the upstream

Jamaica Close / Dyffryn Drive / Woodside Estate issue (see Section 7.14.5,

Marshfield Ward)

Viscount Evan Drive / Beech Grove – a number of properties and the

carriageway are predicted at low risk of surface water flooding however no

surface water flooding has been recorded. Anecdotal comments suggest

highway gullies blockages may have exacerbated localised ponding and a

review of maintenance is planned. The area is drained by the Pontygwew

Reen and largely within the drainage district. Liaison with NRW and

monitoring is also proposed.

Morgan Way – a small number of properties and the carriageway are predicted

at low risk of surface water flooding however no surface water flooding has

been recorded. Monitoring is proposed.





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Table 60 – Local Flood Risk Management measures for Tredegar Park

Location and

Description


Cost

Strategic

Context

S1 Woodside

Estate

Investigate and establish

local flood action group to

monitor & assist with

debris clearance.

Short term

(0-5)

3days FTE

and £5k

(public

meeting)

M43,

M44

S2 Investigate enhancements

to public open space

adjacent to Reen,

providing additional

attennuation

Short term

(0-5)

10days FTE M43,

M44

S3 Monitor Ongoing N/A M53

S4 Viscount Evan

Drive / Beech

Grove

Review highway drainage

maintenance.

Ongoing N/A

(Revenue)

M35

S5 Partnership working with

NRW wrt Reen

Ongoing N/A

(Revenue)

M35

S6 Monitor Ongoing N/A M53, M44

S7 Morgan Way Monitor Ongoing N/A M53



3 0

5 2






Page 152

7.22 Victoria Ward

7.22.1 Overview

Victoria Ward is situated in the central part of NCC, covering an area of Central

Newport to the south-east. It has a population of 7,44734 and an area of 1.03km2,

which is approximately 0.5% of the total area of Newport54. Victoria Ward is

bordered by the River Usk to the west. The ward is relatively flat and contains a

mix of residential, commercial and industrial developments.


The available data indicates that there are no areas at risk flooding associated with

ordinary watercourses. However, problems may occur in isolated locations, for

example due to culvert restrictions. As many of the ordinary watercourses are




in Victoria Ward.

There is one cluster of surface water flooding in Victoria in the centre of the ward

around Chepstow Road area. This area is generally low risk with patches of

medium and high risk potentially affecting properties and the road network. The




There are no reported instances of flooding due to surface water in Victoria.

The table below summarises the impacts of flooding in Victoria based on the


54 Victoria Ward Profile (2014) Newport city council





Page 153

Table 61 – Flood Risk Map counts for Victoria

Totals in

Defined

Area

Risk Counts


High

(>1 in 30

chance in

any year)

Medium

(1 in 30 to

1 in 100

chance in

any year)

Low

(1 in 100 to

1 in 1000

chance in

any year)





7280 21 81 2928




3138 2 23 1075











Ramsar Sites (ha) 0.00 0.00 0.00 0.00


(ha) 9.33 0.00 0.00 0.00


(SINC) (ha) 0.00 0.00 0.00 0.00





Country Parks (ha) 0.00 0.00 0.00 0.00




Guidance (ha) 0.00 0.00 0.00 0.00






Page 154





Page 155

7.22.3 Groundwater



There is one reported instance of DG5 sewer flooding in this ward.



Bristol Street / Manchester Street / Exeter Street / Livingstone Place /

Hereford Street / London Street / Prince Street - A number of properties,

services, local streets and the B4591 highway are predicted at low/medium

risk of surface water flooding. However no historic surface water flooding

has been recorded and the area is relatively flat and understood to be

drained by the combined sewer network. Sewer flooding is recorded on the

periphery of the area and opportunities for surface water surface

attenuation storage to hold back peak flows should be investigated.

Liaison with DCWW is planned with ongoing monitoring.

Marlborough Road / Methuen Road / Jeffrey Street – As above, a number

of properties and local streets are predicted at low/medium risk of surface

water flooding. No historic surface water flooding has been recorded by

NCC. However the Fire Service records attendance to pump flooded

highways locally and local media report the Rodney Parade stadium was

flooded by heavy rain in 2011. As above, the area is relatively flat and

understood to be drained by the combined sewer network and

opportunities for surface water surface attenuation should be investigated.

Liaison with DCWW is planned with ongoing monitoring. Opportunities

for betterment associated with redevelopment should continue to be

explored.

Lennard Street / Halstead Street / Gordon Street / Phillip Street / Witham

Street / Feering Street / Vivian Road – A large number of properties and

streets are predicted at low risk of surface water flooding, with the B4237

highway railway underpass at high risk. No surface water or sewer

flooding is recorded. As above, the area is relatively flat and understood to

be drained by the combined sewer network and opportunities for surface

water surface attenuation storage to hold back peak flows should be

investigated. Liaison with DCWW is planned with ongoing monitoring.

This is linked to the adjacent Walsall Street / Dudley Street issue (see

Section 7.11.5, Liswerry)





Page 156


Table 62 – Local Flood Risk Management measures for Victoria

Location and

Description


Cost

Strategic

Context

T1 Bristol Street /

Manchester Street /

Exeter Street /

Livingstone Place /

Hereford Street / London

Street / Prince Street

Liaison with

DCWW on surface

water disconnection

opportunities

Short term

(0-5 years)

10days

FTE

M24,

M35

T2 Monitor Ongoing N/A

(Revenue)

M53,

M44

T3 Marlborough Road /

Methuen Road / Jeffrey

Street

Liaison with

DCWW on surface

water disconnection

opportunities

Short term

(0-5 years)

10days

FTE

M24,

M35


(Revenue)

M53,

M44

T5 Lennard Street / Halstead

Street / Gordon Street /

Phillip Street / Witham

Street / Feering Street /

Vivian Road

Liaison with

DCWW on surface

water disconnection

opportunities

Short term

(0-5 years)

10days

FTE

M24,

M35


(Revenue)

M53,

M44

Total (non-revenue) 30days FTE


3 3

3 3






Page 157

8 Implementation and Delivery

8.1 Summary of Measures

Table 63 – Summary of local flood risk management proposed measures across NCC

Ward Total (non-revenue) days

(FTE)

Total (non-revenue)

(£k)

Borough-wide 15 £430k

Allt-yr-Yn 2 £170-360k

Alway 15 £30-57k

Beechwood 13 £25-45k

Bettws 21 £71-212k

Caerleon 25 £70-170k

Gaer 20 £20-33k

Graig 25 £6k

Langstone 15 £60-210k

Liswerry 23 £14-24k

Llanwern 3 £32-52k

Malpas 7 £23-28k

Marshfield 19 £18k

Pillgwenlly 10 £7k

Ringland 19 £19-49k

Rogerstone 8 £16-21k

Shaftesbury 13 £11-16k

St. Julians 23 £11k

Stow Hill 23 £12k

Tredegar Park 3 £5k

Victoria 30

Totals 332 £1,050-1,766k

8.2 Implementation Programme

The programme for delivering the management of local flood risk over the 2015

to 2021 period will be dictated by the specific measures required for undertaking

such management and availability of resources/funding. The detailed programme

of implementation of the specific measures which will be developed in the future

when the measures have been investigated and prioritised.





Page 158

8.3 Measure justification

Prioritisation of measures (see Section 4.2) will focus on those issues with a

higher risk or chance of flooding, and those issues impacting on residential

properties.

The standard of service that measures will meet will be determined on their

individual justification, following a risk-based approach to flood risk

management. As a comparison, new residential developments are designed no

property flooding for a 1 in 100 year with allowance for climate change and

sewers are designed for no site flooding in a 1 in 30 annual chance rainfall event.

The approach to justification will be tailored to the identified funder(s)

requirements. For each measure, the benefits (be they tangible or intangible), the

associated costs and the means by which the measures will be funded will need to

be proportionately determined. Details for measures that are not locational

specific such as implementation of awareness campaigns and the provision of

guidance and advice to local communities, business and individuals will be

defined.

8.4 Funding for Local Flood Risk Management

Flood risk management activities in the Borough have primarily been historically

funded through government grants. However moving forwards, a partnership

approach will be required. Implementing the measures will depend on securing

sufficient funding.

Implementing the proposed measures will depend on securing sufficient funding.

Failure to receive additional funding could result in measures identified not being

implemented in part or full, or delayed.

There are local, national and European Union potential funding sources, some

summarised below. These sources could provide either partial funding, match

funding or full funding, and depends upon the nature of the individual scheme.

8.4.1 Public funding

Welsh Government allocates the following grant funding for flood and coastal

erosion risk management in Wales:

Environment & Sustainable Development Grant – Revenue funding to

undertake the requirements of the FWMA. Typically NCC uses this grant to

pay for additional staff resources, maintain the assets register, complete flood

investigations and capacity building. This is not available for capital schemes.

FCERM – (Flood and Coastal Risk Management) Grant in Aid. NCC has no

schemes programmed however is to be replaced by the FIFP and FaCIP.

FIFP – (Flood and Coastal Erosion Innovative Finance Programme)

(programme of up to £150 million capital investment in local authority coastal

flooding and erosion risk management schemes. The programme is about

managing and reducing risks from coastal flooding and erosion and schemes.





Page 159

There is also an expectation on the achievement of wider benefits –

community, social, economic, environmental and social.

FIFP Schemes will:

be financed through borrowing, using the Local Government

Borrowing Initiative or Welsh Government’s direct borrowing powers

– options are being considered.

be co-financed, Welsh Government contribution 75% Local

Authorities 25%.

be identified and business cases developed from 2015 onwards.

be expected to start construction in the period 2018-21.

FaCIP – (Flood and Coast Investment Programme) – Welsh Government

recently consulted55 on this proposed method of funding to which NCC

responded. This consultation considered the way that Welsh Government

allocates funding for flood and coastal erosion risk management in Wales and

ensuring it focuses on those places with the greatest risk. The intention is to

create a clear, objective way of directing funds to places at risk from all

sources of flooding and coastal erosion. NCC (like other authorities) is

currently awaiting for further guidance from Welsh Government on this

funding mechanism.

NCC fund culvert inlet grid cleansing works and highway drainage

maintenance under their standard ‘revenue’ works through the task being

completed by NCC’s direct labour organisation. This is not available for

capital schemes.

Glastir is the Welsh Government’s five-year sustainable land management scheme

and is funded by the Rural Development Programme 2014-2020. Financial

support is offered farmers and land managers for the delivery of environmental

outcomes including improved water management to improve water quality and

reduce flood risk, and contributing towards a reversal in the decline of Wales’

native biodiversity. The Welsh Government offers financial support to eligible

landowners directly to fund capital work targeted at specific locations which are

best placed to deliver the environmental aims of Glastir Advanced.

NCC will continue to liaise with NRW and DCWW to identify what, if any, flood

risk management schemes are being implemented by these Risk Management

Authorities, and whether there is an opportunity to work jointly and share the

costs associated with any of the proposed measures.

Local authorities, such as NCC, have the power to borrow money to fund capital

projects through prudential borrowing56.

55 Flood and Coast Investment Programme (FaCIP). Available from:

http://gov.wales/consultations/environmentandcountryside/flood-and-coast-investment-

programme-facip/?lang=en Accessed: 20/08/15. 56 Capital Finance – Welsh Local Government Association. Available from:

http://www.wlga.gov.uk/capital-finance Accessed: 20/08/15.



http://www.wlga.gov.uk/capital-finance





Page 160

European Union funding is also available from the European Regional

Development Fund (ERDF) where flood schemes can contribute to wider

programme objectives. Newport is within the East Wales operational programme.

8.4.2 Private Funding

DCWW invests in flood schemes as part of their duty to remove properties

form the DG5 register (DG5 is a level of service indicator which examines a

water company’s performance in respect of internal sewer flooding of

properties). Sometimes the most effective way to do this is to work in

partnership with risk management authorities on flood schemes in other areas,

which can help reduce surface water pressure downstream. In particular,

DCWW have developed the RainScape57 initiative to focus on managing the

amount of surface water entering their sewers.

Section 106 of the Town and Country Planning Act 1990 allows planning

obligations to be sought for site-specific mitigations and/or contributions.

These should make the development acceptable in planning terms by

enhancing the quality of the development and providing community benefits

or infrastructure facilities. Planning obligation contributions cannot be pooled

from five or more developments to provide infrastructure which could be

funded through CIL.

Community Infrastructure Levy (CIL) – is a new charging mechanism for

securing contributions from developers and is intended to supplement other

public sector revenue streams, to ensure that new community infrastructure

can be provided to keep pace with population grow. It focuses on the

provision of new infrastructure, not remedying pre-existing deficiencies in

infrastructure unless those deficiencies will be made more severe by new

development. The levy can be used to increase the capacity of existing

infrastructure or to repair failing existing infrastructure, if that is necessary to

support development.

NCC recently consulted58 on CIL charging schedule. Importantly the draft

Regulation 123 list states:

Drainage: The Flood & Water Management Act 2010 requires the use of

Sustainable Drainage Systems (SUDS) for surface water drainage in all new

housing and business development. In future, the design of surface water

drainage will need to be consented by a new Sustainable Drainage Approval

Body, prior to development commencing. However, provision has been made

in the Act for details of these schemes to be submitted, via the local planning

authority, as part of the planning application process. Surface water drainage

is an integral part of new development schemes and, as such, direct

provision by the developer is required.

57 DCWW Rainscape Introduction. Available at: http://www.dwrcymru.com/en/My-

Wastewater/RainScape.aspx Accessed on 26/08/15. 58 NCC Planning – Consultations Community Infrastructure Levy – Preliminary Draft Charging

Schedule Stage. Available at: http://www.newport.gov.uk/en/Planning-

Housing/Planning/Consultations/Consultations.aspx Accessed on 26/08/15.

http://www.dwrcymru.com/en/My-Wastewater/RainScape.aspx

http://www.dwrcymru.com/en/My-Wastewater/RainScape.aspx

http://www.newport.gov.uk/en/Planning-Housing/Planning/Consultations/Consultations.aspx

http://www.newport.gov.uk/en/Planning-Housing/Planning/Consultations/Consultations.aspx





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Where off-site drainage works are required, which are necessary as a

consequence of a new development schemes, these should continue to be

funded by s.106 Obligations. Work to the strategic drainage network will not

be funded by CIL.

Flooding: A significant amount of urban development in the Authority has

taken place alongside rivers, within the river corridor, and often on the Flood

Risk Zone. It is inevitable that some existing development will be vulnerable to

flooding. Where sites are located in the Flood Risk Zone, suitable mitigation

and resilience measures have been agreed with Natural Resources Wales. Any

such measures will be undertaken as an integral part of individual

development schemes and any off- site works will be provided directly via in-

kind contributions, or through s106 obligations. As such, work to flood

defences will not be funded by CIL.

Private and/or community beneficiary contributions - another important

funding mechanism may come in the form of local fundraising from local

communities and businesses that stand to benefit from the proposed flood

schemes.

8.5 Environmental Influences on Measures

8.5.1 Water Framework Directive

Specific measures, particularly structural measures, associated with managing

local flood risk and coastal erosion will have to comply with the requirements of

the WFD (See Section 2.3.5). As part of the on-going liaison between NCC and

Natural Resources Wales, once specific measures are designed, these will be

communicated to NRW for advice. Opportunities to assist the delivery of the

WFD objectives will be sought.

8.5.2 Strategic Environmental Assessment Directive

The LFRMS Strategic Environmental Assessment (SEA) Scoping Report set out

the framework for undertaking further assessments as and when specific measures

– and the strategy itself – are developed further during subsequent stages.

Following on from the Scoping Report, an SEA Report of the LFRMS was

prepared and the conclusions were generally positive. Aligning with the National

Strategy and relevant guidance, there was a clear consideration to integrate

environmental issues and opportunities into the objectives of the LFRMS. Many

of the proposed measures have the potential for direct and indirect environmental

benefits. However, the LFRMS SEA made a number of recommendations to

avoid, reduce or otherwise mitigate the potential for negative effects, and ensure

the potential for positive opportunities were considered.

The recommendations were that the LFRMS should:

Consider flood risk management options that work with natural processes and

provide multiple benefit, for example by working in synergy with the WFD or

environmental enhancement initiatives;





Page 162

Be clear that the processes for developing the next stages of flood risk and

coastal erosion planning, appraisals, implementation and construction of

measures will address the potential for environmental effects;

Use the results of the SEA as an initial guide to the above processes.

NCC will rely on the SEA work completed as part of the LFRMS to meet the

‘SEA’ Regulations. In all cases the exact scope of works required for individual

measures is unknown at this stage and further investigation is planned. The ‘SEA’

Regulations require NCC to monitor the significant environmental effects of the

implementation of the plan – with the aim of identifying unforeseen adverse

effects at an early stage and to allow appropriate remedial action to be taken.

8.5.3 Habitats Regulations Assessment

The Habitats Directive offers protection to natural habitat and wild flora and

fauna. The requirements of the Habitats Directive are implemented in Wales by

the Conservation of Habitats and Species Regulations 2010, often referred to as

the Habitats Regulations. The sites that are afforded protection under this

regulation are referred to as Special Areas of Conservation (SAC) and Special

Protection Areas (SPA) in the UK. As a matter of policy, the Welsh Government

and the UK Government have also chosen to apply the same level of protection to

Ramsar sites. Under the regulations, competent authorities are required to

undertake appropriate assessments where a plan or a project is likely to have an

impact on a protected (SAC, SPA and Ramsar) site. Such assessment is referred to

as a Habitats Regulations Assessment (HRA).

There are many protected sites in Newport covering a variety of habitats59.

Specific measures may be subject to a Habitats Regulations Assessment. The need

for such an assessment will depend upon the type of measure proposed to be

implemented. For instance, a non-structural measure which involves raising flood

risk awareness by holding community engagement exercises will not be subject to

this assessment. However, a structural measure which involves constructing a

flood scheme will be subject to this assessment. The assessment, if required, will

be undertaken in the following four stages.

Stage 1 – Screening - assesses the likely impact of the project, either alone or

in combination with other plans and projects, on a protected site. The

screening process also assesses the significance of the likely impacts.

Stage 2 – Appropriate Assessment - considers the impact of the proposed

project on the integrity of the protected site in relation to its conservation

objectives and its functions. If any adverse impact is identified, then

mitigation measures need to be considered. If the mitigation measures cannot

avoid the adverse impact on the protected site, then consent for the project can

only be granted provided that Stages 3 and 4 are followed.

59 International and National Protected Sites are listed. Available at:

http://www.newport.gov.uk/en/Leisure-Tourism/Countryside--Parks/Biodiversity/Protected-

sites.aspx Accessed 4/10/15

http://www.newport.gov.uk/en/Leisure-Tourism/Countryside--Parks/Biodiversity/Protected-sites.aspx

http://www.newport.gov.uk/en/Leisure-Tourism/Countryside--Parks/Biodiversity/Protected-sites.aspx





Page 163

Stage 3 – Assessment of Alternative Solutions - determines if it is possible to

achieve the objectives of the proposed project by considering alternative

solutions which will have lesser impact on the protected site.

Stage 4 – Imperative Reasons for Over-riding Public Interest (IROPI) - If the

adverse impacts associated with the proposed project cannot be mitigated,

then a Stage 4 assessment is undertaken. If this assessment concludes that the

proposed project should proceed, then compensatory measures, which

maintain the overall coherence of the site, will need to be secured. The

national government will need to be consulted prior to the implementation of

the project. In addition, the Secretary of State for Communities and the local

government will need to inform the EC about the compensatory measures

secured as part of the process.

If the Habitats Regulation Assessment concludes that a certain specific measure

will impact on a protected site, then in addition to a full Habitats Assessment, an

Environmental Assessment will also be undertaken.

Given the requirement to demonstrate wider environmental benefits, measures

that have significant adverse environmental impacts are unlikely to be viewed

positively by the public, the Risk Management Authorities and the Welsh

Government who will need to approve the plan. However, if a particular measure

demonstrates greater benefits for the local community and local businesses, then it

may be possible to justify the adverse environmental impact.





Page 164

9 Public Consultation

Successful management of flood risk relies on having a two way dialogue with

those affected by flooding and at potential risk of flooding. It is important to

enhance their understanding of the risk and increase awareness. At the same time

it is important to understand what is important to them so that measures can be

implemented which prioritise the needs of the community.

The LFRMS preparation included two phases of consultation. An initial public

consultation was undertaken by NCC during November-December 2012 to

understand the views of the residents, businesses and other organisations in

Newport on local flood risk, and help shape the strategy. The LFRMS was drafted

following the initial consultation, and was subjected to a public consultation

during January and February 2013. In addition, NRW, the then Caldicot and

Wentlooge Levels IDB, DCWW and the Welsh Government were also invited to

comment on the draft.

9.1 Consultation on the Draft Local Flood Risk

Management Plan

The draft FRMP will be published in advance of a four-week consultation period

between December 2015 and January 2016, and hosted on the NCC website. The

consultation will include:

Key partners and elected representatives (see Section 4.3)

Residents and businesses in Newport.

A questionnaire will be prepared by NCC and made available to enable residents

and businesses in Newport to provide feedback and comment on the draft FRMP.

Provisions will be made to allow the responses to be received online via the NCC

website and on paper copies posted to NCC offices. NCC will support this by

raising awareness of the consultation using their media channels.

The following questions will be used as prompts:

Question 1 - Do you agree this draft plan sets out the most important issues

with surface water, ordinary watercourses and groundwater flood risk for your

area? If not, please explain what is missing.

Question 2 - What do you consider to be the highest priorities for managing

the risk of flooding in Newport?

Question 3 - This draft plan proposes measures to manage flood risk through

prevention, preparation, protection and recovery/review. Is the balance

between these different types of proposed approaches in the draft plan right? If

not, which proposed measures would you change, and why?

Question 4 – Do you agree with the proposed Borough-wide measures (See

Section 7.2)? Are there other proposed measures that should be included?





Page 165

Question 5 – Are there other proposed local ward measures that should be

included (See Section 7.3 to Section 7.22)? If yes, please explain what they

are and why they should be included.

Question 6 - How can you support the work set out in the draft flood risk

management plan to reduce flood risk?

Question 7 – Do you have any further comments?

Once complete, we will collate the comments received (personal information will

be removed), explain how we have taken them into account and what changes will

be made before the FRMP is finalised. NCC will seek Cabinet approval for the

final FRMP, prior to submission to Welsh Government in February 2016.

9.2 Further Consultation

Additional public consultation(s) will be undertaken when specific measures for

mitigating local flood risk are developed during subsequent stages. These are

likely to be held within the communities where such specific measures are

proposed to be implemented.

As part of their LFMRS, NCC will also undertake appropriate exercises to

increase flood risk awareness across Newport and provide further guidance and

information on managing such risk and minimising damage.





Page 166

10 Monitoring and review

The National Strategy will be formally reviewed on a six-yearly cycle, mirroring

the requirements of the Flood Risk Regulations 2009. This will enable the Welsh

Government to consider the information being produced from the mapping and

planning exercises that the NRW and LLFA complete. This information will also

inform LFRMSs and NCC will review their LFRMS every 6 years, the first being

in 2017 to coincide with the formal review of the National FCERM Strategy.

The measures and delivery programme will be reviewed annually, with a full

review completed by December 2021. Subsequent reviews will be carried out at 6

year intervals. The adhoc addition of measures will be considered, if the need for

emergency works is identified.

References

National strategy for flood and coastal erosion risk management

Newport City Council Preliminary Flood Risk Assessment

Newport City Council Local Flood Risk Management Strategy

Appendices

Appendix A

Historic Local Flood Events





Page A1

A1 Preliminary Flood Risk Assessment Historic

Flooding

Annex 1 of the Newport Preliminary Flood Risk Assessment is reproduced below.

Annex 1 Past floods

Records of past floods and their significant consequences (preliminary assessment report spreadsheet)

Flood ID Summary description Name of Location National Grid

Reference

Location Description Start date Days duration Probability Main source of flooding Additional source(s)

of flooding

Confidence in main

source of flooding

Main mechanism of

flooding

Main characteristic of

flooding

Significant

consequences to

human health

Human health

consequences -

residential properties

Property count method Significant economic

consequences

Number of non-


flooded

Significant

consequences to the

environment

Significant

consequences to

cultural heritage

Data owner Flood event outline

confidence

Mandatory Mandatory Mandatory Mandatory Optional Optional for first cycle Optional for first cycle Optional for first cycle Optional for first cycle Optional Optional Optional for first cycle Optional for first cycle Mandatory Optional Optional Mandatory Optional Mandatory Mandatory Optional Optional

Unique number

between 1-9999

Max 5,000 characters Max 250 characters 12 characters: 2

letters, 10 numbers

Max 250 characters 'yyyy' or 'yyyy-mm' or

'yyyy-mm-dd'

Number with two

decimal places

Max 25 characters Pick from drop-down Max 250 characters,

same source terms

Pick from drop-down Pick from drop-down Pick from drop-down Pick from drop-down Number between 1-

10,000,000

Pick from drop-down Pick from drop-down Number between 1-

10,000,000

Pick from drop-down Pick from drop-down Max 250 characters Pick from drop-down

A sequential number

starting at 1 and

incrementing by 1 for

each record.

Description of the flood and its adverse or potentially adverse consequences. Where

available, information from other fields (Start date, Days duration, Probability, Main source,

Main mechanism, Main characteristics, Significant consequences) should be repeated here.

Name of the locality

associated with the

flood, using recognised

postal address names

such as streets, towns,

counties. If the flood

affected the whole

LLFA, then record the

name of the LLFA.

National Grid

Reference of the

centroid (centre point,

falls within polygon) of

the flood extent, or of

the area affected if

there is no extent

information.

A description of the

general location that

was flooded.

The date when the

flood commenced -

when land not normally

covered by water

became covered by

water.

The number of days

(duration) of the flood -

that land not normally

covered by water was

covered by water.

Values should be

within the range 0.01 -

999.99 (permitting

records to the nearest

quarter of an hour,

where appropriate).

The chance of the

flood occuring in any

given year - record X

from "a 1 in X chance

of occurring in any

given year". Where this

is difficult to estimate,

a range can be

recorded.

Pick the source from

which the majority of

flooding occurred.

Refer to the PFRA

guidance for definitions

of sources.

If flooding occurred

from, or interacted

with, any other sources

(other than the Main

source of flooding),

report the source(s)

here, using the same

source terms.

Pick a broad level of

confidence in the Main

source of flooding

from; 'High'

(compelling evidence

of source - about 80%

confident that source is

correct), 'Medium'

(some evidence of

source but not

compelling - about

50% confident that

source is correct) 'Low'

(source assumed -

about 20% confident

that source is correct)

or 'Unknown'.

Pick a mechanism

from; 'Natural

exceedance' (of

capacity), 'Defence

exceedance'

(floodwater overtopping

defences), 'Failure' (of

natural or artificial

defences or

infrastructure, or of

pumping), 'Blockage or

restriction' (natural or

artificial blockage or

restriction of a

conveyance channel or

system), or 'No data'.

Pick a characteristic

from; 'Flash flood'

(rises and falls quite

rapidly with little or no

advance warning),

'Natural flood' (due to

significant

precipitation, at a

slower rate than a flash

flood), 'Snow melt

flood' (due to rapid

snow melt), 'Debris

flow' (conveying a high

degree of debris), or

'No data'. Most UK

floods are 'Natural

floods'.

Were there any

significant

consequences to

human health when the

flood occurred, or

would there be if it

were to re-occur?

Record the number of


where the building

structure was affected

either internally or

externally by the flood,

or that would be so

affected if the flood

were to re-occur.

Where residential or

non-residential

properties have been

counted, it is important

to record the method of

counting, to aid

comparisons between

counts. Choose from;

'Detailed GIS' (using

property outlines, as

per Environment

Agency guidance),

'Simple GIS' (using

property points),

'Estimate from map', or

'Observed number'.

Were there any

significant economic

consequences when

the flood occurred, or


were to re-occur?

Record the number of

non-residential

properties where the

building structure was

affected either

internally or externally

by the flood, or that

would be so affected if

the flood were to re-

occur.

Were there any

significant

consequences to the

environment when the

flood occurred, or


were to re-occur?

Were there any

significant

consequences to

cultural heritage when

the flood occurred, or


were to re-occur?

Choose from; 'High'

(data includes one of:

Aerial video, Aerial

photos, Professional

survey, Flood level

information, EA flood

data recording staff

notes), 'Medium' (data

includes one of: EA/LA

ground video, EA/LA

ground photos, EA/LA

flood event outline

map, LA/professional

partner officer site

records, Public ground

video), 'Low' (not

confident) or

'Unknown'.

3 Properties flooded at Forge Farm Lane due to a blocked trash screen Ford Farm Lane ST 38335 90181 approx. 2002 0.5 unknown Ordinary watercourses Medium Blockage or restriction Natural flood No 2 or 3 Observed number No No No Newport City Council High

4 Surface water flooding caused by blocked trash screen and collapsed pipe Springfield, Rhiwderin ST 25878 87512 No No No No Newport City Council High-Medium

5 Surface water flooding caused by hydraulic overload of combined sewer Orchard Street ST 31836 89406 No No No No Newport City Council High

6 Surface water flooding caused by hydraulic overload Bank Street ST 31963 89750 No No No No Newport City Council High

7 Surface water flooding caused by blocked trash screen Ringland Circle ST 34879 88026 Ringland Circle Ordinary watercourses Medium Blockage or restriction Natural flood No 28 Observed number No No No Newport City Council High-Medium

8 Surface water flooding Llanwern Road ST 35331 89121 Ordinary watercourses Medium Blockage or restriction Natural flood No 8 Observed number No No No Newport City Council High-Medium

9 Surface water flooding Anson Green ST 35322 89255 No 3 Observed number No No No Newport City Council High-Medium

10 Surface water flooding Roman Way ST 32910 91493 No No No No Newport City Council High-Medium

11 Surface water flooding St Cadocs Close ST 32910 91493 approx.1998 Ordinary watercourses Medium Natural exceedance Natural flood No 8 Observed number No No No Newport City Council High-Medium

12 Surface water flooding Bellin Close ST 33234 91537 Ordinary watercourses Medium Natural exceedance Natural flood No 4 Observed number No No No Newport City Council High

13 Surface water flooding caused by Lotteries Reen overflowing Orchard Street ST 31836 89406 Ordinary watercourses Medium Natural exceedance Natural flood No 16 Observed number No No No Newport City Council High-Medium

14 Surface water flooding caused by Tredegar Reen overflowing Woodside ST 29063 85406 Duffryn Ordinary watercourses Medium Natural exceedance Natural flood No 10 (Elderly persons

complex)

Estimate from map No No No Newport City Council High

15 Surface water flooding Ffos-y-Fran ST 26797 86988 Bassaleg Ordinary watercourses Medium Natural exceedance Natural flood No 4 Estimate from map No No No Newport City Council High

16 Surface water flooding caused by Monks Ditch overflowing Station Road ST 36560 87808 Llanwern Main rivers Ordinary watercourses Medium Natural exceedance Natural flood No Observed number No No No Newport City Council High

17 Surface water flooding St Albans Cottage, St

Mellons Road

ST 25858 81993 Marshfield Ordinary watercourses Medium Natural exceedance Natural flood No 1 Observed number No No No Newport City Council High

18 Surface Water flooding The Uplands,

Rogerstone

ST 26661 88829 Rogerstone Ordinary watercourses Medium Natural exceedance Natural flood No 3 Observed number No No No Newport City Council High

100-120 Main rivers High-Medium

09/07/1997 0.5 1601 Rainfall of 46mm recorded in Newport between 18:00 and 18:45 on 9/7/97 caused extensive

surface water flooding in and around the the centre of Newport. The Met Office considered

this a very rare event occurring once every 160 years. It was confined to a relatively small

area and associated with a thunderstorm.

Newport City Centre

and surrounding

streets.

ST 3099888240 Flash flood Yes UnknownSurface runoff High-Medium Natural exceedance No NoNo Unknown Newport City Council

2 between 28th-30th October 2000 100mm of rainfall had been measured in the Newport area.

This led to flooding throughout the town and in partcular at Goodrich Crescent and Gaer

Vale.

Goodrich Crescent ST 30592 89347 Goodrich Crescent and

surrounding area

30/10/2000 1 Observed number NoDefence exceedance Natural flood Yes 50-60 No Newport City CouncilNo High





Page A2

A2 Recent Historic Flooding

Supplementary records from NewportCC of local flooding incidents that have

occurred since preparation of the PFRA (April 2011) is recorded below.

Recent Past floods

Records of past floods and their significant consequences (preliminary assessment report spreadsheet)

Flood ID Summary description Name of Location National Grid

Reference

Location Description Start date Days duration Probability Main source of

flooding

Additional source(s)

of flooding

Confidence in main

source of flooding

Main mechanism of

flooding

Main characteristic of

flooding

Significant

consequences to

human health

Human health

consequences -


Property count method Significant

economic

consequences

Number of non-


flooded

Property count method Other economic

consequences

Environment

consequences

Data owner Flood event outline

confidence

Mandatory Mandatory Mandatory Mandatory Optional Optional for first cycle Optional for first cycle Optional for first cycle Optional for first cycle Optional Optional Optional for first cycle Optional for first cycle Mandatory Optional Optional Mandatory Optional Optional Optional Optional Optional Optional

1 Surface Water Flooding (Flash Flood)/WW sewer flooding; 8 Residential Larch Grove, Malpas 22/05/2014 Surface runoff DCWW sewer

flooding

High-Medium No data 8 Observed number No

2 Surface Water Flooding (Flash Flood); 3 Residential Almond Drive, Malpas 22/05/2014 Surface runoff High-Medium No data 3 Observed number No

3Surface Water Flooding (Flash Flood); 2 Residential (2 gardens)

Llanover Close,

Malpas

22/05/2014 Surface runoff High-Medium No data 2 Observed number No 2 Gardens

4 Surface Water Flooding (Flash Flood)/culvert flooding; 2 Residential Wavell Drive, Malpas 22/05/2014 Surface runoff Culvert flooding High-Medium No data 2 Observed number No

5Surface Water Flooding (Flash Flood)/WW sewer flooding; 2 Residential

Old Malpas Road,

Malpas

22/05/2014 Surface runoff DCWW sewer

flooding


6Surface Water Flooding (Flash Flood)/WW sewer flooding; 1 Residential

Bryn Bevan,

Shaftesbury


flooding


7 Surface Water Flooding (Flash Flood)/private sewer flooding; 1 Residential Meon Close, Bettws 22/05/2014 Surface runoff Private sewer flooding High-Medium No data 1 Observed number No

8Surface Water Flooding (Flash Flood)/culvert flooding; 2 Residential

The Uplands,

Rogerstone

22/05/2014 Surface runoff Culvert flooding High-Medium No data 2 Observed number No

9Surface Water Flooding (Flash Flood); 1 Residential

Nantymor Cottages,

Coedkernew

22/05/2014 Surface runoff High-Medium No data 1 Observed number No

10Surface Water Flooding (Flash Flood)/sewer flooding; 1 Residential

Church Crescent,

Bassaleg

22/05/2014 Surface runoff Sewer flooding High-Medium No data 1 Observed number No


Ashwell Cottages,

Caerleon


12Surface Water Flooding (Flash Flood)/WW sewer flooding; 2 Residential (1 house, 1 garden)

Caerleon Road, St

Julians


flooding

High-Medium No data 2 Observed number No 1 Garden

13Surface Water Flooding (Flash Flood)/culvert flooding; 1 Residential, 2 Commercial

Orchard Street, St

Julians

22/05/2014 Surface runoff Culvert flooding High-Medium No data 1 Observed number No 2 Observed number


Christchurch Road,

Beechwood



Heather Road,

Beechwood



Woodland Road,

Beechwood


17Surface Water Flooding/culvert flooding; 1 Residential, 1 Commercial

A48 Chepstow Rd,

Langstone

Recurring Surface runoff Culvert flooding High-Medium No data 1 Observed number No 1 Observed number

18

Surface Water Flooding/culvert flooding; Highway

Bishton Rd, between

Waltwood Rd and

Bishton

Recurring Surface runoff Culvert flooding High-Medium No data Highway

19Surface Water Flooding/culvert flooding; Highway

Magor Road, nr j/w

Waltwood Rd



Llanthewy Rd j/w

Bryngwyn Rd

Rarely now Surface runoff Culvert flooding High-Medium No data Highway

21Surface Water Flooding/culvert flooding; Residential

Station Road,

Llanwern Village

Rarely now Surface runoff Culvert flooding High-Medium No data Unknown


Lanstone Lane,

Lanwern Village


23Surface Water Flooding/culvert flooding; Residential (garden)

Pye Corner,

Rogerstone

Recurring Surface runoff Culvert flooding High-Medium No data Unknown Garden

24Welsh Water sewer issue; Highway

Stephenson St, under

Rail Bridge, Liswerry

Occassionally Surface runoff DCWW sewer

flooding

High-Medium No data Highway

25Storm pumping station issue; Highway

Docks Way, under

Rail Bridge, Maesglas

Occassionally Surface runoff Storm pumping station High-Medium No data Highway

26Storm pumping station issue; Highway

Kingsway, under Old

Green, Stow Hill

Occassionally Surface runoff Storm pumping station High-Medium No data Highway

27 Storm Water system issue; Cemetery St Woolos Cemetery Unknown Surface runoff High-Medium No data Cemetery Cemetery





Page A3

A3 Additional Flooding Incidents

Records from South Wales Fire and Rescue of flooding incidents during the

period June 2009 and June 2015 have been used to supplement incident

information. A total of 119 incidents occurred during this period.

newport local flood risk management...5 coordination with the severn river basin management plans 34...

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