181307 omni living, swords road, santry, d09 c623 site specific flood risk assessment ·...

2 Rogans Court Patrick Street, Dun Laoghaire County Dublin, Ireland Email: [email protected] www.eireng.com

Directors: T. Sheehan, J. Lamb Registered in Ireland Company Registration No. 501522 Tel: +353 (1) 6638957

181307

Omni Living,

Swords Road,

Santry,

D09 C623

Site Specific Flood Risk Assessment

mailto:[email protected]

http://www.eireng.com/

181307 Omni Living, Swords Road, Santry, D09 C623 23-03-20 Site Specific Flood Risk Assessment of 22

Document Control:

Revision Status Date Prepared Checked Approved

PL1 Issued for ABP Pre-Planning 11/10/2019 JC ED JL

PL2 Updated to Pre-Planning Comments 20/03/2020 JC ED JL

PL3 Issued for Planning 23/03/2020 JC ED JL


Table of Contents:

1.0 Introduction ................................................................................................................................ 4

2.0 Site Layout and Location ............................................................................................................. 5

2.1 Site Location .................................................................................................................................. 5

3.0 Site Geology ................................................................................................................................ 6

4.0 Flood Risk Identification .............................................................................................................. 7

4.1 Available Flood Studies and Information ...................................................................................... 7

4.2 Historical Flooding (floodmaps.ie) ................................................................................................ 8

4.3 Catchment Flood Risk Assessment and Management Study (CFRAM) (2016) ............................. 8

4.4 Dublin City Development Plan 2016-2022 Strategic Flood Risk Assessment (2016) .................... 9

4.5 FloodResilienCity Project (2012) ................................................................................................. 10

4.6 FloodResilienCity Interim Review October 2011 (2012) ........................................................... 11

4.7 OPW Preliminary Flood Risk Assessment (2011) ........................................................................ 12

4.8 GDSDS Mapping (2005) ............................................................................................................... 12

5.0 Flood Risk Assessment and Mitigation Measures ..................................................................... 14

5.1 Coastal ......................................................................................................................................... 14

5.2 Fluvial .......................................................................................................................................... 14

5.3 Pluvial .......................................................................................................................................... 15

5.4 Groundwater ............................................................................................................................... 15

5.5 Public Sewer ................................................................................................................................ 15

5.6 Flood Risk Summary .................................................................................................................... 16

5.7 Proposed Flood Mitigations Measures ....................................................................................... 16

6.0 Conclusion ................................................................................................................................. 18

Appendix A – Floodmaps.ie Historical Flooding Report........................................................................ 19

Appendix B – Record Drainage Mapping .............................................................................................. 20

Appendix C – Overland Flow Routes ..................................................................................................... 21

Appendix D – Proposed Surface Water Drainage Network .................................................................. 22


1.0 Introduction

This report forms part of a Planning Application for a proposed Strategic Housing Development (SHD)

scheme located at Omni Living, Swords Road, Santry, D09 C623.

This report provides an assessment of the subject site for the fluvial, coastal, pluvial, groundwater and

public sewer flood risk for the proposed development.

The layout of the proposed development is detailed in the series of planning drawings by KMD

Architects submitted with this application.

This report should be read in conjunction with EirEng Consulting Engineers drawings.


2.0 Site Layout and Location

2.1 Site Location

The location of the proposed development is identified in red in Figure 1 below.

Figure 1 - Subject Site Location

The existing site is located on the Swords Road, Santry, D09 C623. The site is bounded on the north

by an existing industrial estate, on the east by the Swords Road, on the south by an existing petrol

station/fast food outlet and on the west by existing commercial units. The site sits higher than the

adjacent Swords Road which falls away from the site in both the north and south direction.

The proposed development involves the demolition of an existing commercial building and the

construction of three residential apartment blocks, one of which also includes an aparthotel. An

underground basement will provide car parking as well as plant rooms and lifts to service the

development.

Access to the site will be from the existing private industrial road which runs along the northern

boundary of the site. Access for set down areas located on the south of the site will be provided via

the existing Omni Shopping development.


Figure 2 - Local Geological Conditions

3.0 Site Geology

Geological Survey Ireland was consulted to determine the geological conditions of the site and the

surrounding area.

The sub-soil on the site is identified as “Made Ground” which would be typical for an urban

environment. The underlying bedrock on the site is identified as dark limestone and shale and part of

the Lucan Formation. The formation comprises of dark-grey to black, fine-grained, micritic limestones

with interbedded dark-grey calcar.

The groundwater vulnerability for the site is classified as low and no karst features are identified within

the surrounding area.


4.0 Flood Risk Identification

An assessment of flood risk for the site has been undertaken in accordance with the 2009 DEHLG/OPW

Guidelines on Flood Risk Management.

The objectives are to:

• Identify potential sources of flood risk

• Confirm the level of flood risk and identify key hydraulic features • Assess the impact the proposed development has on flood risk • Develop appropriate flood risk mitigation and management measures which will allow for

the long-term development of the site.

The relevant components to be considered in the identification and assessment of flood risk are as

per Table A1 of the 2009 DEHLG/OPW Guidelines:

• Coastal – flooding from high sea levels

• Fluvial – flooding from water courses

• Pluvial – flooding from rainfall / surface water

• Ground Water – flooding from springs / raised ground water

• Public Sewer – flooding from public sewers

Each component will be investigated and an assessment of the likelihood of a flood occurring will be

undertaken as well as the possible consequences of a flood event.

4.1 Available Flood Studies and Information

The area surrounding the site has been subject to several indicative flood mapping and modelling

studies. The studies examined as part of this flood risk assessment are detailed below:

• Historical Flooding – Floodmaps.ie (1965)

• Catchment Flood Risk Assessment and Management Study (CFRAM) (2016)

• Dublin City Development Plan 2016-2022 PFRA (2016)

• FloodResilienCity Project (2012)

• FloodResilienCity Interim Report October 2011 (2012)

• OPW Preliminary Flood Risk Assessment (2011)

• GDSDS Sewer Flood Maps (2005)


Figure 3 Floodmaps.ie Record Flood Events

4.2 Historical Flooding (floodmaps.ie)

Floodmaps.ie was consulted to identify any historical flooding within the vicinity of the site. A flood

event identification node is located adjacent to the site but actually relates to a flood event of the

River Wad in 1965. This event occurred approximately 550m south of the site at the point where the

river is culverted underneath the Swords Road.

The Floodmaps.ie historical report is included in Appendix A.

4.3 Catchment Flood Risk Assessment and Management Study (CFRAM) (2016)

The National CFRAM study involved detailed hydraulic modelling of river bodies and coastal areas and

is the most detailed flood mapping undertaken in the Dublin region. The project commenced in June

2011 with final flood maps issued during 2016.

The CFRAM flood maps do not cover the area of the site and as such do not identify any flood risk for

the site. The nearest available map is located approximately 1km from the site, where limited fluvial

and no coastal flooding is indicated.


Figure 4 Santry CFRAMS Flood Mapping (2016)

4.4 Dublin City Development Plan 2016-2022 Strategic Flood Risk Assessment (2016)

The Dublin City Development Plan 2016-2022 Strategic Flood Risk Assessment (SFRA) was prepared

to provide an area-wide assessment of all types of significant flood risk to inform strategic land use

planning decisions. As part of the SFRA a number of predictive flood maps as well as historical

flooding information was analysed to create a composite flood map.

The SFRA flood maps do not cover the area of the site and as such do not identify any flood risk for

the site. The nearest available map is located approximately 1km from the site where limited fluvial

and no coastal flooding, pluvial or groundwater flooding is indicated.


Figure 5 Dublin City Development Plan 2016-2022 PFRA (2016)

4.5 FloodResilienCity Project (2012)

As part of a European wide programme, Dublin city was included in a collaboration with other EU

authorities to share knowledge and experience in relation to flood risk.

The main output of the project was a citywide pluvial flood risk map which was developed from a

detailed hydraulic model based on the 180mm (1% AEP) event.

As can be seen in Figure 6 below a portion of the site is identified as having a risk of pluvial flooding.


4.6 FloodResilienCity Interim Review October 2011 (2012)

Following on from the FloodResilienCity study a report was commissioned to analyse the fluvial and

pluvial flooding events which occurred across Dublin city due to an extreme rainfall event on the 23rd

and 24th October 2011. These extreme rainfall events have been estimated to be between a 1 in 50

and 1 in 100 year event across the majority of Dublin.

As part of the report a series of detailed maps identifying areas that flooded and their cause was

created. As can be seen in Figure 7 below there was no pluvial or fluvial flooding recorded on or

adjacent to the site during the October 2011 event.

Figure 7 FloodResilientCity Interim Review October 2011 (2012)

Figure 6 FloodResilienCity Pluvial Flood Maps (2012)


4.7 OPW Preliminary Flood Risk Assessment (2011)

The OPW Preliminary Flood Risk Assessment (PRFA) was a national screening study which identified

areas that may be at a significant risk associated with flooding. As such it was not a detailed

assessment of flood risk but rather an indicative study with the majority of the fluvial and coastal

information contained within the report since being superseded by the national CFRAM study.

However, the PFRA also contains useful pluvial and groundwater flooding information which was

reviewed as part of this FRA. As can be seen in Figure 8 below there is no pluvial or groundwater

flooding identified on or adjacent to the proposed site.

Figure 8 OPW PFRA (2011)

4.8 GDSDS Mapping (2005)

The Greater Dublin Strategic Drainage Strategy (GDSDS) was completed in 2005 and involved the

mapping and modelling of major sewer lines in the greater Dublin area. From the recommendations

of the report policies were implemented to ensure a consistent approach to drainage infrastructure,

planning, design, construction and operation. As part of the study maps were produced for the future

2031 scenario showing sewer lines at risk of surcharging and flooding.

As can be seen in Figure 9 below the public surface water sewers located in the Swords Road adjacent

to the site were not modelled as part of the study. The nearest public surface water sewers identified


on the GDSDS flood maps are located in the adjacent Magenta Hall housing estate and approximately

200m south of the site in the Swords Road. Both public surface water sewers are identified as flooding

less than 5m3 volume for the 5 year return period event, while the downstream 225mm sewer is

identified as flooding for a 30 year return period or less.

Record drainage mapping information is included in Appendix B.

Figure 9 GDSDS Sewer Flooding Maps (2005)


5.0 Flood Risk Assessment and Mitigation Measures

5.1 Coastal

As detailed previously the national CFRAM study did not identify any coastal flood risk for the site.

The nearest available map is approximately 1km from the site and identifies no coastal flooding.

Floodmaps.ie was also checked to identify any past coastal flooding events within the vicinity of the

site and none were found.

Based on the above information and given that the Irish Sea lies approximately 6km from the subject

site, and the site level is 56m above sea level the site is considered to be at low risk of coastal flooding.

5.2 Fluvial

The Santry River lies approximately 1km north of the site and the River Wad lies approximately 550m

south of the site.

As detailed previously the national CFRAM study did not identify any fluvial flood risk for the site. The

nearest available map is approximately 1km from the site and identifies limited fluvial flooding from

the Santry River.

As the Santry River is a significant distance from the site and as the site is approximately 10m higher

than the Santry River, it is not considered to pose a flood risk to the site.

Floodmaps.ie was also checked to identify any past fluvial flooding events within the vicinity of the

site. A flood event identification node was found to be located adjacent to the site which related to

an event that occurred in 1965 from the River Wad.

The event occurred approximately 550m south of the site at the point where the river is culverted

underneath the Swords Road. As the event occurred a significant distance from the site and as the

site is approximately 10m higher than the River Wad, it is not considered to pose a flood risk to the

site.

As detailed previously the Dublin City Development Plan SFRA flood maps did not identify any flood

risk for the site. The nearest available map is approximately 1km from the site and identifies limited

fluvial flooding.

The FloodResilienCity Interim Review October 2011 mapping did not identify any fluvial flooding on

the site.

Based on the above information the site is considered to be at low risk of fluvial flooding.


5.3 Pluvial

Pluvial flooding is the result of rainfall-generated overland flows which arise before run-off can enter

a watercourse or sewer. It is usually associated with high intensity rainfall and typically occurs in the

summer months.

As detailed previously the FloodResilienCity pluvial flood maps have identified a portion of the site at

risk of pluvial flooding.

It is worth noting that the modelling for the pluvial flood map was based on a relatively broadscale

digital terrain model which did not include small scale (less than 2m2) features, walls or other barriers

to flow and is intended to indicate the potential for pluvial risk.

The FloodResilienCity Interim Review October 2011 mapping did not identify any pluvial flooding on

the site.

Floodmaps.ie was used to identify any past pluvial flooding events within the vicinity of the site and

none were found. There is also no anecdotal evidence of any historic pluvial flooding within the site.

Based on the above information, and primarily on the FloodResilienCity flood maps, the site is

considered to be at risk of pluvial flooding.

5.4 Groundwater

As detailed previously the OPW PRFA flood maps do not identify any groundwater flood risk for the

site.

The GSI groundwater vulnerability classification for the site is low and there are no karst features

located in the area surrounding the site.

Floodmaps.ie was used to identify any past groundwater flooding events within the vicinity of the site

and none were found.

Based on the above information the site is considered to be at low risk of groundwater flooding.

5.5 Public Sewer

As detailed previously GDSDS sewer flood mapping for the area does not cover the public surface

water sewer located in the Swords Road adjacent to the site.

The nearest public surface water sewers identified on the GDSDS flood maps are located in the

adjacent Magenta Hall housing estate and approximately 200m south of the site in the Swords Road.


Both public surface water sewers are identified as flooding less than 5m3 volume for the 5 year return

period event, while the downstream 225mm sewer is identified as flooding for a 30 year return period

or less.

The public surface water sewer in the Swords Road mapped as part of the GDSDS is located

approximately 200m south of the site and at a ground level approximately 4m lower than the subject

site.

Given the height difference between the existing public surface water sewers and the proposed

development, and the overland flow paths leading away from the site, the site is considered to be at

low risk of public sewer flooding.

5.6 Flood Risk Summary

Based on the information detailed above the site is considered to be at low risk of flooding from

coastal, fluvial, groundwater and public sewer sources.

The site is considered to be at risk of flooding from pluvial sources.

In accordance with the Department of Environment, Heritage and Local Government and the Office

of Public Work’s jointly published Guidance Document for Planning Authorities - The Planning System

and Flood Risk Management – the site is located within Flood Zone C and no justification test is

required.

As such the proposed development for the site is appropriate for the level of flood risk subject to

mitigation measures being implemented to account for the pluvial flooding risk. The proposed

mitigations measures are detailed in the following section.

5.7 Proposed Flood Mitigations Measures

As detailed previously the site is considered to be at risk of pluvial flooding based on the

FloodResilienCity pluvial flooding maps. The following section details flood risk management

strategies which will be implemented to mitigate the risk of pluvial flooding.

The finished floor level of the proposed development is at a level of 56.400m which provides a

freeboard of between 0.700m – 1.250m above Swords Road. A topographical survey of the site and

surrounding areas including Swords Road was undertaken and it was identified that the site is located

at a high point along Swords Road with the road falling away from the site to the north and to the

south.

Overland flow routes will also be incorporated into the development with any overland flows directed

towards the central landscaping areas located between each apartment block and with a flow pathway


provided through the external hardstanding areas of the site. A sketch detailing the overland flow

routes , including existing overland flow routes, is included in Appendix C.

Localised ramping (in accordance with Building Regulations Part M) will provide a threshold of at least

50mm at the entrance to all ground floor doorways to provide protection during extreme rainfall

events.

A surface water drainage system with SUDS features will be incorporated into the development to

positively drain the entire site and to manage surface water run-off from the site. Significant blue and

green sedum roof extents as well as planting and landscaping at surface level will capture the first

flush of intense rainfall events. All surface water flows will be conveyed to a storm water attenuation

tank. The attenuation tank is designed to accommodate the 1 in 100 year flood event plus an

additional 20% for climate change. The outflow from the attenuation tank will be limited to 2 l/s/ha.

A maintenance schedule will be established by the management company for the development to

ensure the surface water drainage network undergoes regular maintenance. The surface water

drainage network will also be inspected after extreme weather events to check for damage and

blockages. The proposed surface water drainage network and SUDS features are detailed on EirEng

drawing 181307-C002 included in Appendix D.

Site access to the development is to be provided from the industrial access road to the north which

links the adjacent industrial/commercial units with Swords Road. The proposed basement access

ramp to the underground car parking area connects into the existing industrial road which runs along

the northern boundary of the site and is located at a high point on the site. The ramp sits outside the

extents of the pluvial flooding shown on the FloodResilienCity maps.

A localised shallow ramp at the access connection point into the existing industrial road will provide a

passive threshold of 100mm to protect the basement from potential overland flow routes from the

existing roadway. This passive protection will consist of a raised footpath crossing the access ramp

entrance which will also have the benefit of providing pedestrian priority. The existing industrial

roadway connects into the Swords Road at a steep gradient and as such falls away from the site at a

significant fall, directing any overland flows onto the Swords Road and away from the site.

The combination of significant freeboard above the Swords Road level, the boundary treatment, the

localised ramping at ground floor entrance doorways to provide a threshold, overland flow routes

directed away from the buildings and a surface water drainage network including attenuation storage

designed to best practice guidelines is considered to be sufficient mitigation measures to provide

protection to the development from the potential pluvial flooding risk.


6.0 Conclusion

Having reviewed the available information the site is considered to be at low risk of coastal and fluvial

flooding and therefore in accordance with the Department of Environment, Heritage and Local

Government and the Office of Public Work’s jointly published Guidance Document for Planning

Authorities - The Planning System and Flood Risk Management – is located within Flood Zone C.

The site is also considered to be at low risk of ground water and public sewer flooding.

The site is considered to be a risk of pluvial flooding based on the FloodResilienCity mapping. Several

mitigation measures including significant freeboard above the Swords Road level, the boundary

treatment, the localised ramping at ground floor entrance doorways to provide a threshold, overland

flow routes directed away from the buildings and a surface water drainage network including

attenuation storage designed to best practice guidelines is considered to be sufficient mitigation

measures to provide protection to the development from the potential pluvial flooding risk.

As the site will be positively drained, with the proposed SUDS measures reducing the outflow from

the site to 2 l/s/ha, and as the existing overland flow routes are within the Swords Road falling away

from the site, the proposed development will have no measurable increase on the flood risk to

neighbouring lands.

As a result of the analysis, design and mitigation measures the proposed development is considered

to be in line with the core principles of the Planning Guidelines and Objective outlined in the Dublin

City Development Plan 2016-2022.

Under the Planning Guidelines the site is therefore considered suitable for development of

commercial and residential land uses.


Appendix A – Floodmaps.ie Historical Flooding Report

181307 Omni Living, Swords Road, Santry, D09 C623 23-03-20 Site Specific Flood Risk Assessment Page 20 of 22

Appendix B – Record Drainage Mapping

Legend

dR Unknown Meter ; Other Meter

c Sluice Valve Open

f Sluice Valve Closed

Water Hydrants

Hydrant Function

© Fire Hydrant

±

Cap

! Other Fittings

Water Distribution Mains

Owned By

Irish Water

Private

Irish Water

Sewer Manholes

Manhole Type

! Standard

Gravity - Foul

Storm Manholes

Manhole Type

! Standard

Surface Gravity Mains

1:1,000

Dublin City

SO16398504CL 54.4IL 52.93

SO16397604CL 56.84IL 54.6

SO16397506CL 56.37IL 54.37

SO16397605CL 56.41IL 55.35

SO16398603CL 55.04IL 53.47

SO16397504CL 56.05IL 53.87

SO16397503CL 53.86IL 52.85

SO16397704CL 54.96IL 53.83

SO16398403CL 53.95IL 52.54

SO16397502CL 54.96IL 53.91

SO16397603CL 55.56IL 54.08

SO16398505CL 54.81IL 53.29

SO16397507CL 56.48IL 53.81

SO16398501CL 54.47IL 51.61

SO16397402CL 53.59IL 51.15

SO16397505CL 56.06IL 53.39

SO16398503CL 54.28IL 51.44

SO16397601CL 55.28IL 51.94

SO16398601CL 55.14IL 52.14

SO16398605CL 55.26IL 53.42

SO16397701CL 55.01IL 52.11

225mm Concrete

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Ordnance Survey Ireland 2018

´

1. No part of this drawing may be reproduced or transmitted in any form or stored in any retrievalsystem of any nature without the written permission of Irish Water as copyright holder except asagreed for use on the project for which the document was originally issued.

2. Whilst every care has been taken in its compilation, Irish Water gives this information as to theposition of its underground network as a general guide only on the strict understanding that it is based on the best available information provided by each Local Authority in Ireland to Irish Water. Irish Water can assume no responsibility for and give no guarantees, undertakings or warrantiesconcerning the accuracy, completeness or up to date nature of the information provided and doesnot accept any liability whatsoever arising from any errors or omissions.This information should notbe relied upon in the event of excavations or any other works being carried out in the vicinity of theIrish Water underground network. The onus is on the parties carrying out excavations or any otherworks to ensure the exact location of the Irish Water underground network is identified prior to excavations or any other works being carried out. Service connection pipes are not generally shown but their presence should be anticipated.

© Copyright Irish Water

Reproduced from the Ordnance Survey Of Ireland by Permission of the Government. License No. 3-3-34

a3 - Scale

0 2512.5

Meters

Date: 07/02/2019


Appendix C – Overland Flow Routes

ST

AIR

S 1

FF

L +

58.619

FF

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59.519

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W

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A

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56.38

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ST

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56.40

56.40

56.

40

56.40

56

51

LP

LP

LP

LP

LP

LP

LP

LP

LP

LP

LP

LP

LP

LP

LP

B

B

56.40

56.

40

falls 1/60

falls 1/60

56.40

B

BA

CK

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P C

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LE

R

80

00

40

00

6200

PROPOSED SITE

OVERLAND FLOW

ROUTES

EXISTING OVERLAND

FLOW ROUTES


Appendix D – Proposed Surface Water Drainage Network

STATOIL

McD

ON

ALD

S

Y

IE

L

D

EX

-S

W

EX

-S

W

EX

-S

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W

EX

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EX

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W

EX

-S

W

EX

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W

EX

-S

W

EXSMH

CL 55.560

IL 54.080

EXSMH

CL 54.980

IL 53.820

EXSMH

CL 56.050

IL 53.870

EXSMH

CL 56.370

IL 54.370

EXSMH

CL 53.960

IL 52.850

EX

-S

W

EX

-S

W

EX

-S

W

EX

-S

W

EX

-S

W

EX

-S

W

EXSMH

CL 56.840

IL 54.600

E

X

-

S

W

E

X

-

S

W

EXSMH

CL 55.520

IL 53.940

EXSMH

CL 55.050

IL 52.700

E

X

-

S

W

E

X

-S

W

E

X

-S

W

EXSMH

CL 55.840

IL 54.340

E

X

-S

W

E

X

-S

W

E

X

-S

W

300Ø

225Ø

X

X

X

X

X

X

X

X

X

X

EX

-SW

EX

-SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SWMH 1.0

CL - 57.000

IL - 55.530

225Ø

@

1:225

225Ø @1:225

SWMH 2.0

CL - 56.350

IL - 55.230

PROPOSED AQUACELL GEOCELLULAR ATTENUATION TANK OR

SIMILAR APPROVED TO PROVIDE 454m3 OF ATTENUATION STORAGESWMH 11.0

CL - 56.100

IL - 53.350

SWMH 4.1

CL - 56.000

IL - 54.615

SWMH 9.0

CL - 56.200

IL - 54.370

150m

m @

1:150m

m S

LU

NG

150m

m @

1:150m

m S

LU

NG

SWMH5.0

CL - 56.100

IL - 54.472

SWMH6.0

CL - 56.100

IL - 54.425

225m

m

@

1:225m

m

S

LU

NG

SW

S

W

S

W

S

W

S

W

SW

SW

SW

SW

SW

SW

SW

SW

SWMH 3.0

CL - 56.120

IL - 55.191

SWMH 9.1

CL - 56.100

IL - 54.625

SWMH 8.0

CL - 56.200

IL - 54.425

225Ø

@

1:225

3

0

0

Ø

@

1

:2

2

5

IL 53.000

CONNECTION INTO

EXISTING SURFACE WATER

MANHOLE WITH 300mm

BACKDROP CONNECTION

EXISTING MANHOLE TO BE

RECONSTRUCTION AS REQUIRED

TO MATCH NEW INVERT LEVELS

150m

m @

1:150m

m S

LU

NG

150m

m @

1:150m

m S

LU

NG

225m

m @

1:225m

m S

LU

NG

225m

m @

1:225m

m S

LU

NG

225m

m @

1:225m

m S

LU

NG

225m

m @

1:225m

m S

LU

NG

150m

m @

1:150m

m S

LU

NG

SWMH 7.0

CL - 56.100

IL - 54.465

150Ø

@

1:100

SWMH 12.0

CL - 56.100

IL - 53.135

EXISTING PRIVATE

SURFACE WATER

SEWER TO BE MADE

REDUNDANT

SW

EXISTING PRIVATE SURFACE

WATER SEWER TO BE RELAID

ALONG SAME ROUTE AT A

LOWER INVERT LEVEL

150Ø@

1:100

SW

R

G

R

G

SWMH4.0

CL - 56.100

IL - 54.502

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100 EXISTING ADJACENT

EXCESS CAR S

PACES

ASSIGNED TO PROPOSED

RETAIL IN SUBJECT

APPLICATION

59 PUBLIC C

AR

PARK SPACES

8242

8233

SWMH 1.0

CL - 57.000

IL - 55.530


WATER MANHOLE AND

UPSTREAM OMNI SHOPPING

CENTRE CAR PARK DRAINAGE

NETWORK TO BE RETAINED

EXISTING PRIVATE SURFACE WATER

SEWER TO BE REROUTED AND

RELAID AT A LOWER INVERT LEVEL.

ALL EXISTING CONNECTIONS TO BE

MAINTAINED

SWMH 10.0

CL - 56.000

IL - 53.510

FLOW CONTROL MANHOLE

TO LIMIT OUTFALL FLOW

RATE TO 2.3L/S

General

1. If this drawing has been received electronically it is the

recipients responsibility to print the document to the

correct scale.

2. All dimensions are in (mm.) unless otherwise noted.

3. All levels are in meters above datum unless otherwise

noted.

4. This drawing is to be read in conjunction with all the

relevant Engineers', Services Engineers, Manufacturers

& Architects drawings and specifications.

PROJECT TITLE

DRAWING TITLE

CLIENT

SCALE

DRAWING NUMBERREVISION

STATUS

REVISIONS

REV DATE DESCRIPTIONBY

JOB NO.

DRAWN BY

ENG CHECK

EIRENG CONSULTING ENGINEERS

c

This drawing and any design hereon is the copyright of the Consultants

and must not be reproduced without their written consent. All drawings

remain the property of the Consultants.

Figured dimension only to be taken from this drawing. All

dimensions to be checked on site. Consultants to be informed

immediately of any discrepancies before work proceeds.

DATE

DATE

APPROVED DATE

A1/A3

SHEET

2 Rogan's Court, Patrick Street,Dun Laoghaire, Co.Dublin, Ireland.

Tel: +353 1 6638957 Email: [email protected]

CONSULTING ENGINEERS

I

Aprvd.

OMNI PARK SHOPPING CENTRE

CONSORTIUM

OMNI LIVING, SWORDS ROAD, SANTRY, D09 C623

PROPOSED EXTERNAL SURFACE

WATER AND BASEMENT SLUNG

DRAINAGE LAYOUT

L. Lonergan 26-08-19

J. Cunniffe26-08-19

E. Deasy 26-08-19

PLANNING

181307 C002 PL2

N

E

S

W

EIRENG CONSULT ENG Ltd.ORDNANCE SURVEY IRELANDLICENCE NO. EN0073620 CORDNANCE SURVEY IRELAND

SW

PROPOSED EXTERNAL

SURFACE WATER SEWER

PROPOSED SURFACE

WATER MANHOLE

EX-SW

LEGEND:

PROPOSED SURFACE WATER

SLUNG DRAINAGE PIPE

SWH1.0

SW

EX-SW

EXISTING PUBLIC SURFACE

WATER SEWER


WATER SEWER

PROPOSED SEDUM GREEN ROOF

EXTENTS

PROPOSED BLUE ROOF EXTENTS

PROPOSED BUILDING EXTENTS

EXISTING ROAD SURFACE WATER

DRAINAGE NETWORK AND OUTFALL

TO BE RETAINED ALONG PRIVATE

INDUSTRIAL ROAD

PROPOSED BASEMENT OUTLINE

PL1 11.10.19 LL ED PLANNING ISSUE

1:500 A1 - 1:1000 A3

EXISTING PRIVATE SURFACE WATER

SEWER CONTINUES SOUTH THROUGH

OMNI SHOPPING CENTRE DEVELOPMENT

BEFORE CONNECTING INTO AN EXISTING

7500mm DIAMETER PUBLIC SURFACE

WATER SEWER ON SHANLISS ROAD

NOTE:

ALL SURFACE WATER DRAINAGE WITHIN

THE BASEMENT EXTENTS WILL BE SLUNG

AND CONNECT INTO THE PROPOSED

EXTERNAL SURFACE WATER NETWORK

NOTE:

COMBINED BLUE ROOF AREAS WILL

PROVIDE APPROXIMATELY 149m3

OF ATTENUATION STORAGE.

OUTLINE OF

BASEMENT BELOW

OUTLINE OF

BASEMENT BELOW

EXISTING PRIVATE

SURFACE WATER

SEWER

EXISTING PUBLIC

750Ø SURFACE

WATER SEWER

OMNI CENTRE

CARPARK

SURFACE WATER OUTFALL ROUTE

SCALE 1:1000@A1

1:2000@A3

EX SMH

EX-SW


WATER SEWER MANHOLE


WATER SEWER TO BE REMOVED

EX-SW

EX-SW

XX

EXISTING PUBLIC SURFACE

WATER SEWER MANHOLE

EX SMH

EX SMH

EX SMH

EX SMH

EX SMH

300Ø

375Ø

450Ø

525Ø

5

2

5

Ø

5

2

5

Ø

CONNECTION OF EXISTING PRIVATE

SURFACE WATER SEWER INTO

EXISTING 750mm PUBLIC SEWER

PL2 23.03.20 LL ED PLANNING ISSUE

PROPOSED TRAPPED ROAD

GULLY

RG

SW

1/ ALL DIMENSIONS ARE IN (mm.) UNLESS OTHERWISE NOTED.

CONTRACTOR SHALL BE RESPONSIBLE FOR SETTING OUT JUNCTION BOXES, CHAMBERS,

MANHOLES, GULLIES TO ENSURE NO CLASHES WITH SERVICE DUCTS AND PIPES.

2/ ALL LEVELS ARE IN METRES ABOVE DATUM UNLESS OTHERWISE NOTED.

3/ THIS DRAWING SHOULD BE READ IN CONJUNCTION WITH ALL

RELEVANT ARCHITECT'S, ENGINEER'S AND MANUFACTURERS'

DRAWINGS AND SPECIFICATIONS.

4/ ALL PIPE DIAMETERS ARE NOMINAL.

5/ THE CONTRACTOR MUST CONTACT THE RELEVANT AUTHORITIES

PRIOR TO CONSTRUCTION WORK, AND SATISFY HIMSELF IN

RESPECT TO THE LOCATION OF ALL EXISTING SERVICES.

7/ ALL ROAD GULLY DRAINS ARE 150mm.

8/ 600mm MAX. LENGTH ROCKER PIPES ARE TO BE PROVIDED

ON SEWERS WHERE:

(A). A PIPE ENTERS A MANHOLE OR PUMPING STATION.

(B). A PIPE LEAVES A MANHOLE.

(C). A PIPE ENTERS CONCRETE ENCASEMENT.

(D). A PIPE LEAVES CONCRETE ENCASEMENT.

(E). ANY OTHER LOCATION AS DIRECTED BY THE ENGINEER.

9/ ALL SEWER ROCKER PIPES ARE TO BE FORMED BY CUTTING

AND TRIMMING A LENGTH OF SPIGOT & SOCKET PIPE TO FORM

A SPIGOT AT THE CUT END, THEREBY FORMING SPIGOT & SOCKET

JOINTS AT BOTH ENDS OF THE ROCKER PIPE.

10/ ALL ROCKER PIPES SHALL BE NO MORE THAN 150mm FROM THEIR

ASSOCIATED MANHOLE, PUMPING STATION, CONCRETE ENCASED SECTION

OR VALVE CONNECTION.

11/ WHERE SEWER PIPES, RISING MAINS OR ROAD GULLY DRAINS

CROSS EXISTING ROADS, THE CONTRACTOR IS REQUIRED TO:

(A). CONTACT THE RELEVANT AUTHORITIES PRIOR TO COMMENCING

WORK.

(B). MAKE GOOD THE EXISTING ROAD TO ITS ORIGINAL SPECIFICATION

AS APPROVED BY THE ENGINEER.

(C). UNDERTAKE WORK TO THE STANDARDS OF THE RELEVANT LOCAL AUTHORITY

SPECIFICATION.

16/ CCTV SURVEY TO BE CARRIED OUT ON ALL NEW DRAINAGE RUNS

& CCTV SURVEY INTERPRETIVE REPORT & DRAWINGS TO BE ISSUED TO

ENGINEERS WITH 3No ADDITIONAL COPIES FOR THE LOCAL AUTHORITY

& SAFETY FILE.

17/ ALL COVERS OF EXISTING MANHOLES TO BE BUILT TO FINAL FINISHED

PAVEMENT OR DRAINAGE LEVELS.

18/ COVER LEVELS DETAILED ARE INDICATIVE. COVER LEVELS TO TIE IN

FLUSH WIT PROPOSED PAVEMENT & LANDSCAPING LEVELS.

19/ INTERNAL DRAINAGE TO ARCHITECT & M&E DETAILS

20/ GULLY LAYOUT TO BE CONFIRMED WITH ARCHITECT PRIOR TO DETAILED

DESIGN

21/ RODDING EYES REQUIRED ON ALL SUSPENDED DRAINAGE RUNS AT MAX

22m INTERVALS AND AT ALL JUNCTIONS OR CHANGES IN PIPE DIRECTIONS.

22/ LEVELS ON ALL EXISTING DRAINAGE TO BE CONFIRMED ONSITE.

23/ ALL EXISTING DRAINS TO BE INVESTIGATED FOR LIVE CONNECTIONS PRIOR

TO CONSTRUCTION. LIVE CONNECTIONS TO BE MAINTAINED TO SEWERS

6/ ALL STORMWATER PIPES TO BE POLYPIPE RIGIDRAIN OR SIMILAR APPROVED.

ALL FOUL PIPE TO BE UPVC PIPES BY WAVIN OR SIMILAR APPROVED TO

WIS 4-35-01 and IS EN 13476.

12/ ALL EXISTING FOUL & SURFACE WATER RUNS SERVING THE BUILDING

THAT BECOMES REDUNDANT DUE TO THE NEW DEVELOPMENT TO BE BROKEN

OUT AND TRENCH/MANHOLES TO BE BACKFILLED WITH CL16/20 LEAN MIX CONCRETE

13/ WHERE PIPES PASS UNDER FOUNDATIONS PIPE TRENCH TO BE BACKFILLED TO

FORMATION LEVEL WITH CL16/20 CONCRETE.

14/ WHERE PIPES ARE LOCATED WITHIN 3m OF PAD FOUNDATIONS CONCRETE SURROUND

CL16/20 REQUIRED TO A LEVEL ABOVE THE PAD FOUNDATIONS. WHERE PIPES PASS

UNDER FLOOR SLABS, PIPES TO BE SURROUND WITH 150mm CONCRETE +50mm

COMPRESSIBLE FILL BOARD/SAND SHOULD DIVIDE UNDERSIDE OF SLAB & TOP OF

CONCRETE SURROUND (DETAIL TO BE AGREED WITH STRUCTURAL ENGINEER)

15/ ALL EXISTING MAIN SEWER RUNS TO BE JETTED TO REMOVE BLOCKAGES/DEBRIS, ALL

EXISTING DRAINAGE RUNS & MANHOLES TO BE CLEARED OF DEBRIS, CLEANED, JETTED

AND CCTV CARRIED OUT. INTERPRETIVE REPORT, DVD & DRAWINGS TO BE INCLUDED &

ISSUED TO DESIGN ENGINEER PRIOR TO CONSTRUCTION.

DRAINAGE NOTES

26/ CONTRACTOR TO PROVIDE IL, PIPE DIAMETER AND DIRECTION OF

FLOW IN EXISTING MANHOLE ON COMMENCEMENT OF THE WORKS

TO DESIGN ENGINEER.

24/ ALL SURFACE WATER MANHOLE COVER TO BE SQUARE IN SHAPE.

ALL FOUL WATER MANHOLES TO BE CIRCULAR IN SHAPE.

25/ CONTRACTOR TO COORDINATE ALL ROOF DRAINAGE AND

DOWNPIPES LOCATIONS TO BE AGREED WITH THE ENGINEER AND

ARCHITECT.

27/ ALL SLUNG GRAVITY DRAINAGE PIPEWORK TO WIS 4-35-01 AND IS EN 13476.

28/ PUMPED RISING MAIN TO BE DUCTILE IRON PIPE WORK AND FITTINGS

TO BE IN ACCORDANCE WITH IS EN 598

29/ FOUL SEWER MANHOLES TO BE PRE-CAST, ALL SURFACE WATER

AND COMBINED MANHOLES TO BE BLOCKWORK AS PER GDSDS V6.0

30. ALL MANHOLE COVERS LOCATED IN PAVING AREAS TO BE RECESSED

TYPE WITH GALVINISED STEEL TRIMMING ALLOWING FOR PAVING

INSERTS TO LANDSCAPE ARCHITECTS DETAIL. MANHOLE COVER

LOADINGS TO COMPLY WITH RELEVANT MANHOLE BUILDUP.

31/ ALL DRAINAGE PIPEWORK & MANHOLE CONSTRUCTION TO BE WATERTIGHT

AND ALL MANHOLE LIDS TO BE DOUBLE SEALED. ALL PIPEWORK MUST BE

TESTED TO THE APPROPRIATE AIR TIGHTNESS TEST AND TEST RESULTS

SUBMITTED TO ENGINEER FOR APPROVAL.

SLUNG DRAINAGE, PROPRIETARY CONNECTIONS, SEALING AND FIXINGS

TO BE DESIGNED BY OTHERS TO MANUFACTURERS REQUIREMENTS.

DETAILS TO BE SUBMITTED TO ENGINNER FOR APPROVAL PRIOR TO

WORKS COMMENCING.

NOTE:

IT IS NOT PROPOSED THAT ANY OF THE

PROPOSED SURFACE WATER DRAINAGE

NETWORK WILL BE TAKEN IN CHARGE BY

THE LOCAL AUTHORITY

181307 omni living, swords road, santry, d09 c623 site specific flood risk assessment ·...

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