appendix k – flood evacuation plan p 2014 01128 revised flood risk assessment …...

Pinnacle Consulting Engineers Limited Flood Risk Assessment Revision D 33 Hawkins Lane, Burton

Appendix K – Flood Evacuation Plan

carole.booth

Text Box

P_2014_01128 Revised Flood Risk Assessment - Part 3 Received 10.12.14

Flood Evacuation Strategy

Hawkins Lane, Burton on Trent

Tesco Stores Ltd

20-Nov-14

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Pinnacle Consulting Engineers Limited Flood Evacuation Strategy Issue B 2 Hawkins Lane, Burton on Trent

CONTENT

1 EXECUTIVE SUMMARY ............................................................................................................... 3

2 INTRODUCTION ............................................................................................................................ 4

2.1 Aims and Objectives ............................................................................................................ 4

2.2 Aim ....................................................................................................................................... 4

2.3 Contents of this Plan ............................................................................................................ 4

2.4 Site Location ........................................................................................................................ 4

2.5 Flood Risk ............................................................................................................................ 4

3 ENVIRONMENT AGENCY FLOODLINE WARNINGS DIRECT ................................................... 6

3.1 Flood Warning Service ......................................................................................................... 6

3.2 Floodline Warning Direct ...................................................................................................... 6

3.3 Gauging River Levels ........................................................................................................... 6

3.4 Three Day Flood Risk Forecast ........................................................................................... 7

4 TESCO FLOOD CONTINGENCY MEASURES ............................................................................ 8

4.1 Evacuation ........................................................................................................................... 8

4.2 Car Park Management ......................................................................................................... 8

4.3 Flood Evacuation Resource Required ................................................................................. 8

4.4 Dissemination of the Tesco Flood Evacuation Plan ............................................................ 8

4.5 Training ................................................................................................................................ 8

4.6 Plan Activation Flow Diagram .............................................................................................. 9

5 ROLES AND RESPONSIBILITIES DURING PLAN ACTIVATION .............................................. 12

5.1 Store Manager ................................................................................................................... 12

5.2 Personnel Manager, Customer Service Manager, Trading Manager ................................ 12

5.3 Section Managers .............................................................................................................. 13

5.4 General Assistants / Customer Services Assistants .......................................................... 13

5.5 Trolley Attendants .............................................................................................................. 13


1 EXECUTIVE SUMMARY

Pinnacle Consulting Engineers Ltd have been commissioned by Tesco Stores Ltd to carry out a Flood Evacuation Plan for a proposed retail development in Burton-upon-Trent, Staffordshire. This proposed development includes a new Tesco Retail Store and its associated car parks.

This Flood Evacuation Plan has been prepared for Health and Safety reasons to enable safe evacuation of the car park and proposed Tesco Store in the event of the existing flood defence breaching.

This plan has been written under the assumption that the following resources and equipment have been purchased and/or acquired and that this equipment is in possession of the Tesco Burton-upon-Trent store prior to a flood:

Loudhailer

Car park closure road sign and redirection signs

A permanent warning sign informing customers that the car park is liable to flood

Road Barriers Warning lights, and

Tesco Flood Evacuation Plan

Furthermore, this plan has been written under the assumption that the plan will be disseminated to the following Category 1 and 2 responders upon the completion of the development:

East Staffordshire Police

East Staffordshire Fire and Rescue

East Staffordshire County Council


2 INTRODUCTION

2.1 Aims and Objectives

This Flood Evacuation Plan has been prepared to ensure an appropriate response at the site in the event of a flood warning. The Plan records contingency measures that have been drawn up to maximise the safety of staff and customers of Tesco, Burton-upon-Trent in advance of a major flood event. The Plan will be disseminated to the emergency services to ensure responding agencies are aware of Tesco’s pre-planned emergency measures.

2.2 Aim

To provide a safe and well organised store closure and evacuation of customers and staff from the site during a major flood event.

2.2.1 Objectives

To safely evacuate both people and vehicles from the site in advance of a major flood event

To safeguard people and property by preventing access to the site in times of flood

To ensure safety by raising awareness to the flood risk

To define the areas of responsibility for those participating in the plan

To establish procedures for implementing the plan

To reduce the risk to life

To reduce financial loss during a flood event

To have set security procedures during a flood event.

2.3 Contents of this Plan

This section explains the Tesco Burton Flood Evacuation Plan. Section 3.6 explains how the plan should be phased in three distinct stages:

Phase 1: Plan Implementation;

Phase 2: Car Park and Store Evacuation;

Phase 3: Store and Car Park Closure.

These are further explained in Sections 4.6.1, 4.6.2 and 4.6.3 respectively. The specific roles and responsibilities of employees are detailed in Section Error! Reference source not found..

2.4 Site Location

The site for the proposed development is situated off Hawkins Lane, Burton Business Park, Burton-upon-Trent, East Staffordshire. The site is located approximately 350m west of the River Trent and the development proposals comprise a Tesco retail store and Petrol filling station together with associated car parking and servicing areas. The Tesco superstore is to be located along the northern boundary of the site with the car parking forming the southern boundary.

2.5 Flood Risk

The Flood Risk Assessment has identified that the site is at risk of fluvial flooding from the River Trent, although existing flood defences provide protection to the 1 in 200 year event.


Information published by the Environment Agency indicates that most of the site falls within Flood Zone 3a, albeit protected by flood defences (depicted in Figure 2.1), which have been implemented by a series of alleviation schemes since the 1960’s. The initial scheme was in response to the 1947 floods. It is of note that these flood alleviation schemes were observed to have operated effectively during the November 2000 flood event, although water did seep through weaknesses in the parts of the structure. The defences throughout Burton have gradually been brought up to the 1 in 200 year standard.

Figure 3.1 EA Flood Zone Map (Approximate Site Extents Edged Red)

Site specific flood data provided by the Environment Agency shows that, should flood defences be breached, the flood level within the site peak at a level of 45.36m AOD under a 1:100 year plus climate change event. A peak water level of 45.36m AOD is also shown to occur under an overtopping of the flood defences under a 1 in 1000 year event.

Finished Floor Levels have been set at 46.14m AOD, providing in excess of the 300mm freeboard requested by the Environment Agency, to ensure the store remains dry during these events. Vehicles egress is onto Hawkins Lane, which sits at a lower elevation to the store and is shown to be flooded under the events noted above.

This evacuation plan therefore seeks to evacuate the store on appropriate warning from the EA, prior to flooding occurring on Hawkins Lane.


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3.4 Three Day Flood Risk Forecast

In addition to the above, the Environment Agency also provides a three day flood risk forecast accessible on their website at:

http://www.environment-agency.gov.uk/homeandleisure/floods/125305.aspx

This forecast is updated daily and although published at a coarse grid scale, it provides an initial and advance warning for flood risk. It is recommended that this forecast be monitored regularly by Tesco Stores Ltd.


4 TESCO FLOOD CONTINGENCY MEASURES

4.1 Evacuation

This Flood Evacuation Plan has been designed to ensure the safe closure and evacuation of the site. The closure and evacuation will be initiated by the store manager based on the flood warning services offered by the Environment Agency.

The management of the store should make preparations for an evacuation upon the issue of a ‘Flood Warning’.

Since the store is considered at risk from extreme events, it is proposed that evacuation takes place only once a ‘Severe Flood Warning’ has been issued.

4.2 Car Park Management

During the lead time, the evacuation of the car park will be managed by trained staff directing vehicles away from the site and closing access to entering vehicles during a flood. Cones may be used to assist this process and if used, they should be large enough and numerous enough to be seen and weighted to ensure they are not affected by flood water or winds. Any portable elements of the car park management system will need to be stored in an easily accessible location on site, so they can be deployed at short notice.

Car park closure signs should be positioned at on or near the barriers/cones when they are erected.

4.3 Flood Evacuation Resource Required

When the plan is implemented the following resources will be required:

Loudhailer

Car park closure road sign and redirection signs

A permanent warning sign informing customers that the car park is liable to flood

Road barriers / cones

Warning lights, and

Tesco Flood Evacuation Plan for the Burton-upon-Trent site.

4.4 Dissemination of the Tesco Flood Evacuation Plan

The plan should be disseminated to the following agencies:

East Staffordshire Police

East Staffordshire Fire and Rescue

East Staffordshire County Council

4.5 Training

All staff need to be made aware of the store's Flood Evacuation Plan. It is understood that regular fire training workshops are held for all Tesco staff and so it is suggested that a flood training session be incorporated into these workshops. This training should be refreshed every 6 months and should be mandatory for all new staff.

The workshops will highlight the risk and procedures and it is recommended that they include a test to ensure that staff understand the flood and fire procedures. After 6 months all staff should be required to re-sit the test.


4.6 Plan Activation Flow Diagram

The evacuation plan is divided into three stages:

Phase 1: PLAN INITIATION (Section 4.6.1)

Phase 2: STORE AND CAR PARK EVACUATION (Section 4.6.2)

Phase 3: STORE AND CAR PARK CLOSURE (Section 4.6.3)

4.6.1 Phase 1: Phase Initiation

On receipt of a Flood Warning message:

The Store Manager is to phone the Environment Agency Floodline Direct for an update of the

situation and the likely flood scenario and inform other managers.

If the Store Manager receives an indication that overtopping of the banks and/or breaching of

the flood defenses is expected to occur, he/she will start the evacuation procedures and close

the site. This indication may come from Floodline or the local EA office.

The Store Manager will call EMS and the Store Director who may come to the store to provide

further assistance.

Each manager will inform the team members of the activation of the store Flood Evacuation

Plan. Trolley attendants are to be directed to stand at the front of the store to provide

reassurance and direction to the public.

The Store Manager is to contact East Staffordshire Constabulary and inform them that the

store's Flood Evacuation Plan has been activated and ask for assistance if it is required.

All delivery Lorries are to stop unloading stock and move away from the loading bay. If the

Lorries come in contact with the floodwater they will be classified as contaminated and will

need to be disinfected.

The Store Manager will announce the following statement over the public address system to

the customers:

‘This is the Store Manager speaking. The Environment Agency has issued a Flood Warning message for this area. Although there is no immediate danger to the store, zones (name zones at risk) of the car park are at risk of flooding. Tesco values your health and safety and so as a precaution have decided to close the store and evacuate the car park of all vehicles with immediate effect. If your vehicle is currently parked here, please calmly leave your shopping in the store and make your way to the exit. There are staff on hand to answer any questions. We appreciate your understanding in this matter and apologise for any inconvenience’.

4.6.2 Phase 2: Evacuation

Checkout Assistants are to assist and bill customers at the till as soon as the message has

been announced. Other customers in the store are to calmly be told to leave their shopping

and vacate the store. Checkout Assistants are to then close the checkouts and secure the

cash tills. Staff are to provide assistance to customers where necessary in evacuation of the

store.

Trolley attendants and senior staff should be located at the front of the store to provide

assistance and guidance to the customers.


Cars are to leave the store in an orderly fashion (a relocation arrangement within the site may

be detailed at a later date). Staff are not insured to direct traffic and so should not assist with

the car park evacuation. If local police are available they may be able to help with the

evacuation.

The Store Manager is responsible for organising the temporary closure of the store and car

park. This will require the installation of a temporary barrier to prevent access to the car park

and car park closure signs at the entrance to the car park and the entrance to the main store

(Maps will be provided at the detailed design stage).

4.6.3 Phase 3: Store Closure

Once customers have moved their vehicles, managers will confirm that the car park is empty.

If vehicles are still left unattended, managers are to use the public address system to alert

customers of vehicle number plates.. Barriers and warning lights are to be erected.

The Store Manager is to ensure that barriers or cones remain in place at the entrances to the

car park until the flood risk has receded and that barriers are affixed with lights so that they

are visible at night.

The Manager is to ensure that the cash tills are secured and that the Cash Office is securely

locked.

Normal Store closing procedures are to be followed and staff are to be sent home after roll

call.

Staff should be advised to liaise with their section manager regarding the ‘all clear’ and store

Re-opening.

A summary of the evacuation plan process is included in Figure 4.1.


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5 ROLES AND RESPONSIBILITIES DURING PLAN ACTIVATION

This section of the Flood Evacuation Plan details the specific tasks that have been allocated to Tesco employees to ensure that the plan is carried out correctly and as efficiently as possible.

5.1 Store Manager

5.1.1 Prior to activation of the Flood Evacuation Plan

Contact the Environment Agency Floodline for further information.

Inform Section Managers of rising water levels.

Contact the Store Director and explain the situation.

5.1.2 During activation of the Flood Evacuation Plan

Once the car park is clear of vehicles, erect barriers (or cones), to ensure the car park is not

used by new customers or staff.

Contact EMS.

Contact East Staffordshire Police Constabulary. Inform them that the Flood Evacuation Plan

has been activated and that assistance may be requested in the near future.

Announce the following statement to the public over the public address system:

‘This is the Store Manager speaking. The Environment Agency has issued a Flood Warning for this area. Although there is no immediate danger to the store, the car park is at risk of flooding. Tesco values your health and safety and so as a precaution has decided to close the store and evacuate the car park of all vehicles with immediate effect. If your vehicle is currently parked here, please calmly leave your shopping in the store and make your way to the exit. There are staff on hand to answer any questions. We appreciate your understanding in this matter and apologise for any inconvenience’.

Inform delivery drivers to stop any deliveries and move the vehicles to higher ground.

If necessary use the loudhailer to speak to the public as they are leaving the store.

Place a car park closure sign at the entrance of the car park. This is to inform customers that

they cannot enter the car park. This task can be delegated.

Once all members of the public have evacuated their vehicles, ensure that any remaining

other members of the public and staff have left the store. The store should then be closed.

The Store Manager should maintain contact with the Environment Agency’s FWD service and

await the ‘all clear’.

The store and car park should be checked for flood damage.

Staff can return to the store which can be reopened.

Signs, barriers and cones can be removed.

5.2 Personnel Manager, Customer Service Manager, Trading Manager


Ensure Managers have attended the flood workshop and successfully completed the

subsequent test within the last 6 months.



Continue operations as normal unless directed by the Store Manager. The store manager will

be handling the evacuation.

5.3 Section Managers


Ensure all staff have attended the flood workshop and successfully completed the subsequent

test within the last 6 months.


Disseminate the flood risk to the store to your team members.

If the Store Manager decides to close the store and car park, warn your staff that an

announcement will be made to all customers, informing them of the imminent closure. Tell

trolley attendants they may be required to stop work and stand at the front of the store to

provide reassurance to the public evacuating their cars.

When all customers have been successfully evacuated, roll call your team

before they also evacuate the site.

Close the store.

5.4 General Assistants / Customer Services Assistants

5.4.1 During the Flood Evacuation Plan

You may be required to help with the closure and evacuation of the car park. If you are, please

remember:

Do not help with the flow of traffic leaving the store. Health and safety guidance stipulates that

no staff can help with the flow of traffic.

Do not allow any new customers to enter the store and car park, provide an explanation.

5.5 Trolley Attendants

5.5.1 During the Flood Evacuation Plan

Once informed by your Team Leader of the store closure, stop work and report to your Section

Manager.


Appendix L – Sewer Records


Appendix M – Proposed Drainage Strategy


Appendix N – Drainage Calculations

Pinnacle Page 1Mercury House Tesco Stores Ltd.Broadwater Road Burton on Trent, Hawk...Welwyn Garden City A... 131016-201-P1-202-P2Date 08/04/2014 14:57 Designed by B.FoxFile 131016-201-P1-20... Checked by K.ElvyCADS Network 2013.1.1

STORM SEWER DESIGN by the Modified Rational Method

Design Criteria for Storm

©1982-2013 Micro Drainage Ltd

Pipe Sizes STANDARD Manhole Sizes STANDARD

FEH Rainfall ModelReturn Period (years) 100

Site Location GB 424700 323950 SK 24700 23950C (1km) -0.027D1 (1km) 0.321D2 (1km) 0.341D3 (1km) 0.294E (1km) 0.307F (1km) 2.386

Maximum Rainfall (mm/hr) 50Maximum Time of Concentration (mins) 30

Foul Sewage (l/s/ha) 0.000Volumetric Runoff Coeff. 0.750

Add Flow / Climate Change (%) 0Minimum Backdrop Height (m) 0.000Maximum Backdrop Height (m) 2.000

Min Design Depth for Optimisation (m) 0.600Min Vel for Auto Design only (m/s) 1.00Min Slope for Optimisation (1:X) 1000

Designed with Level Soffits

Time Area Diagram for Storm

Time(mins)

Area(ha)

Time(mins)

Area(ha)

Time(mins)

Area(ha)

0-4 0.605 4-8 1.113 8-12 0.077

Total Area Contributing (ha) = 1.795

Total Pipe Volume (m³) = 126.913

Network Design Table for Storm

PN Length(m)

Fall(m)

Slope(1:X)

I.Area(ha)

T.E.(mins)

BaseFlow (l/s)

k(mm)

HYDSECT

DIA(mm)

1.000 47.600 0.595 80.0 0.193 5.00 0.0 0.600 o 525

Network Results Table

PN Rain(mm/hr)

T.C.(mins)

US/IL(m)

Σ I.Area(ha)

Σ BaseFlow (l/s)

Foul(l/s)

Add Flow(l/s)

Vel(m/s)

Cap(l/s)

Flow(l/s)

1.000 50.00 5.32 43.625 0.193 0.0 0.0 0.0 2.51 542.5 26.1




PN Length(m)

Fall(m)

Slope(1:X)

I.Area(ha)

T.E.(mins)

BaseFlow (l/s)

k(mm)

HYDSECT

DIA(mm)

1.001 87.200 0.396 220.0 0.350 0.00 0.0 0.600 o 525

2.000 89.800 0.544 165.0 0.248 5.00 0.0 0.600 o 4502.001 95.400 0.398 240.0 0.117 0.00 0.0 0.600 o 4502.002 26.900 0.112 240.0 0.129 0.00 0.0 0.600 o 450

1.002 16.600 0.024 700.0 0.186 0.00 0.0 0.600 o 7501.003 50.800 0.073 700.0 0.000 0.00 0.0 0.600 o 750

3.000 36.500 0.215 170.0 0.274 5.00 0.0 0.600 o 450

4.000 29.200 0.365 80.0 0.139 5.00 0.0 0.600 o 225

5.000 28.895 0.361 80.0 0.113 5.00 0.0 0.600 o 225

3.001 18.600 0.078 240.0 0.046 0.00 0.0 0.600 o 450

1.004 7.300 0.010 700.0 0.000 0.00 0.0 0.600 o 7501.005 45.100 0.064 700.0 0.000 0.00 0.0 0.600 o 750


PN Rain(mm/hr)

T.C.(mins)

US/IL(m)

Σ I.Area(ha)

Σ BaseFlow (l/s)

Foul(l/s)

Add Flow(l/s)

Vel(m/s)

Cap(l/s)

Flow(l/s)

1.001 50.00 6.28 43.030 0.543 0.0 0.0 0.0 1.51 326.0 73.5

2.000 50.00 5.95 44.737 0.248 0.0 0.0 0.0 1.58 251.3 33.62.001 50.00 7.16 44.193 0.365 0.0 0.0 0.0 1.31 208.0 49.42.002 50.00 7.51 43.795 0.494 0.0 0.0 0.0 1.31 208.0 66.9

1.002 50.00 7.77 42.409 1.223 0.0 0.0 0.0 1.05 463.9 165.61.003 50.00 8.58 42.385 1.223 0.0 0.0 0.0 1.05 463.9 165.6

3.000 50.00 5.39 44.350 0.274 0.0 0.0 0.0 1.56 247.5 37.1

4.000 50.00 5.33 44.550 0.139 0.0 0.0 0.0 1.46 58.2 18.8

5.000 50.00 5.33 44.575 0.113 0.0 0.0 0.0 1.46 58.2 15.3

3.001 50.00 5.63 43.960 0.572 0.0 0.0 0.0 1.31 208.0 77.5

1.004 50.00 8.69 42.312 1.795 0.0 0.0 0.0 1.05 463.9 243.11.005 50.00 9.41 42.302 1.795 0.0 0.0 0.0 1.05 463.9 243.1


Manhole Schedules for Storm


MHName

MHCL (m)

MHDepth(m)

MHConnection

MHDiam.,L*W

(mm)PN

Pipe OutInvert

Level (m)Diameter(mm)

PNPipes InInvert


Backdrop(mm)

SW1 44.850 1.225 Open Manhole 1500 1.000 43.625 525

SW2 45.600 2.570 Open Manhole 1500 1.001 43.030 525 1.000 43.030 525

SW4 45.887 1.150 Open Manhole 1350 2.000 44.737 450

SW5 46.000 1.807 Open Manhole 1350 2.001 44.193 450 2.000 44.193 450

SW5A 45.975 2.180 Open Manhole 1350 2.002 43.795 450 2.001 43.795 450

SW3 45.829 3.420 Open Manhole 1800 1.002 42.409 750 1.001 42.634 525

2.002 43.683 450 975

SW6 45.800 3.415 Open Manhole 1800 1.003 42.385 750 1.002 42.385 750

SW7 45.500 1.150 Open Manhole 1350 3.000 44.350 450

SW9 45.475 0.925 Open Manhole 1200 4.000 44.550 225

SW10 45.500 0.925 Open Manhole 1200 5.000 44.575 225

SW8 45.550 1.590 Open Manhole 1350 3.001 43.960 450 3.000 44.135 450 175

4.000 44.185 225

5.000 44.214 225 29

SW11 45.500 3.188 Open Manhole 1800 1.004 42.312 750 1.003 42.312 750

3.001 43.883 450 1270

SW12P 45.500 3.198 Open Manhole 2100 1.005 42.302 750 1.004 42.302 750

SW26 45.000 2.763 Open Manhole 1200 OUTFALL 1.005 42.237 750


PIPELINE SCHEDULES for Storm

Upstream Manhole


PN HydSect

Diam(mm)

MHName

C.Level(m)

I.Level(m)

D.Depth(m)

MHConnection

MH DIAM., L*W(mm)

1.000 o 525 SW1 44.850 43.625 0.700 Open Manhole 15001.001 o 525 SW2 45.600 43.030 2.045 Open Manhole 1500

2.000 o 450 SW4 45.887 44.737 0.700 Open Manhole 13502.001 o 450 SW5 46.000 44.193 1.357 Open Manhole 13502.002 o 450 SW5A 45.975 43.795 1.730 Open Manhole 1350


3.000 o 450 SW7 45.500 44.350 0.700 Open Manhole 1350

4.000 o 225 SW9 45.475 44.550 0.700 Open Manhole 1200

5.000 o 225 SW10 45.500 44.575 0.700 Open Manhole 1200

3.001 o 450 SW8 45.550 43.960 1.140 Open Manhole 1350

1.004 o 750 SW11 45.500 42.312 2.438 Open Manhole 18001.005 o 750 SW12P 45.500 42.302 2.448 Open Manhole 2100

Downstream Manhole

PN Length(m)

Slope(1:X)

MHName

C.Level(m)

I.Level(m)

D.Depth(m)

MHConnection

MH DIAM., L*W(mm)

1.000 47.600 80.0 SW2 45.600 43.030 2.045 Open Manhole 15001.001 87.200 220.0 SW3 45.829 42.634 2.670 Open Manhole 1800

2.000 89.800 165.0 SW5 46.000 44.193 1.357 Open Manhole 13502.001 95.400 240.0 SW5A 45.975 43.795 1.730 Open Manhole 13502.002 26.900 240.0 SW3 45.829 43.683 1.696 Open Manhole 1800


3.000 36.500 170.0 SW8 45.550 44.135 0.965 Open Manhole 1350

4.000 29.200 80.0 SW8 45.550 44.185 1.140 Open Manhole 1350

5.000 28.895 80.0 SW8 45.550 44.214 1.111 Open Manhole 1350

3.001 18.600 240.0 SW11 45.500 43.883 1.168 Open Manhole 1800

1.004 7.300 700.0 SW12P 45.500 42.302 2.448 Open Manhole 21001.005 45.100 700.0 SW26 45.000 42.237 2.013 Open Manhole 1200


Free Flowing Outfall Details for Storm


OutfallPipe Number

OutfallName

C. Level(m)

I. Level(m)

MinI. Level

(m)

D,L(mm)

W(mm)

1.005 SW26 45.000 42.237 43.750 1200 0

Simulation Criteria for Storm

Volumetric Runoff Coeff 0.750 Additional Flow - % of Total Flow 0.000Areal Reduction Factor 1.000 MADD Factor * 10m³/ha Storage 2.000

Hot Start (mins) 0 Inlet Coeffiecient 0.800Hot Start Level (mm) 0 Flow per Person per Day (l/per/day) 0.000

Manhole Headloss Coeff (Global) 0.500 Run Time (mins) 60Foul Sewage per hectare (l/s) 0.000 Output Interval (mins) 1

Number of Input Hydrographs 0 Number of Storage Structures 1Number of Online Controls 1 Number of Time/Area Diagrams 0Number of Offline Controls 0 Number of Real Time Controls 0

Synthetic Rainfall Details

Rainfall Model FEHReturn Period (years) 100


Summer Storms YesWinter Storms YesCv (Summer) 0.750Cv (Winter) 0.840

Storm Duration (mins) 30


Online Controls for Storm


Pump Manhole: SW12P, DS/PN: 1.005, Volume (m³): 13.4

Invert Level (m) 42.302

Depth (m) Flow (l/s) Depth (m) Flow (l/s) Depth (m) Flow (l/s) Depth (m) Flow (l/s)

0.100 13.5000 0.900 13.5000 1.700 13.5000 2.500 0.00000.200 13.5000 1.000 13.5000 1.800 13.5000 2.600 0.00000.300 13.5000 1.100 13.5000 1.900 13.5000 2.700 0.00000.400 13.5000 1.200 13.5000 2.000 13.5000 2.800 0.00000.500 13.5000 1.300 13.5000 2.100 0.0000 2.900 0.00000.600 13.5000 1.400 13.5000 2.200 0.0000 3.000 0.00000.700 13.5000 1.500 13.5000 2.300 0.00000.800 13.5000 1.600 13.5000 2.400 0.0000


Storage Structures for Storm


Cellular Storage Manhole: SW6, DS/PN: 1.003

Invert Level (m) 43.076 Safety Factor 2.0Infiltration Coefficient Base (m/hr) 0.00000 Porosity 0.95Infiltration Coefficient Side (m/hr) 0.00000

Depth (m) Area (m²) Inf. Area (m²) Depth (m) Area (m²) Inf. Area (m²)

0.000 1058.0 0.0 2.001 0.0 0.02.000 1058.0 0.0 2.600 0.0 0.0

Manhole Headloss for Storm

PN US/MHName

US/MHHeadloss

1.000 SW1 0.5001.001 SW2 0.5002.000 SW4 0.5002.001 SW5 0.5002.002 SW5A 0.5001.002 SW3 0.5001.003 SW6 0.5003.000 SW7 0.5004.000 SW9 0.5005.000 SW10 0.5003.001 SW8 0.5001.004 SW11 0.5001.005 SW12P 0.500


Summary of Critical Results by Maximum Level (Rank 1) for Storm


Simulation CriteriaAreal Reduction Factor 1.000 Additional Flow - % of Total Flow 0.000

Hot Start (mins) 0 MADD Factor * 10m³/ha Storage 2.000Hot Start Level (mm) 0 Inlet Coeffiecient 0.800

Manhole Headloss Coeff (Global) 0.500 Flow per Person per Day (l/per/day) 0.000Foul Sewage per hectare (l/s) 0.000


Synthetic Rainfall DetailsRainfall Model FEHSite Location GB 424700 323950 SK 24700 23950

C (1km) -0.027D1 (1km) 0.321D2 (1km) 0.341D3 (1km) 0.294E (1km) 0.307F (1km) 2.386

Cv (Summer) 0.750Cv (Winter) 0.840

Margin for Flood Risk Warning (mm) 0.0Analysis Timestep 2.5 Second Increment (Extended)

DTS Status ONDVD Status OFF

Inertia Status OFF

Profile(s) Summer and WinterDuration(s) (mins) 15, 30, 60, 120, 180, 240, 360, 480, 600,

720, 960, 1440, 2160, 2880, 4320, 5760,7200, 8640, 10080

Return Period(s) (years) 1Climate Change (%) 0

PN StormReturnPeriod

ClimateChange

First XSurcharge

First YFlood

First ZOverflow

O/FAct.

LvlExc.

1.000 15 Winter 1 0%1.001 15 Winter 1 0%2.000 15 Winter 1 0%2.001 15 Winter 1 0%2.002 15 Winter 1 0%1.002 120 Winter 1 0%1.003 60 Winter 1 0% 1/60 Winter3.000 15 Winter 1 0%4.000 15 Winter 1 0%5.000 15 Winter 1 0%3.001 15 Winter 1 0%1.004 120 Winter 1 0% 1/15 Summer1.005 120 Winter 1 0% 1/15 Summer




PNUS/MHName

WaterLevel(m)

Surch'edDepth (m)

FloodedVolume(m³)

Flow /Cap.

O'flow(l/s)

PipeFlow(l/s) Status

1.000 SW1 43.701 -0.449 0.000 0.05 0.0 23.7 OK1.001 SW2 43.191 -0.364 0.000 0.19 0.0 58.4 OK2.000 SW4 44.845 -0.342 0.000 0.12 0.0 29.7 OK2.001 SW5 44.333 -0.310 0.000 0.20 0.0 38.9 OK2.002 SW5A 43.960 -0.285 0.000 0.29 0.0 50.6 OK1.002 SW3 43.147 -0.011 0.000 0.21 0.0 45.5 OK1.003 SW6 43.146 0.012 0.000 0.10 0.0 40.4 SURCHARGED3.000 SW7 44.469 -0.331 0.000 0.16 0.0 34.0 OK4.000 SW9 44.638 -0.137 0.000 0.32 0.0 17.2 OK5.000 SW10 44.653 -0.147 0.000 0.26 0.0 13.9 OK3.001 SW8 44.165 -0.245 0.000 0.43 0.0 70.8 OK1.004 SW11 43.235 0.172 0.000 0.13 0.0 37.7 SURCHARGED1.005 SW12P 43.237 0.185 0.000 0.03 0.0 13.5 SURCHARGED














Time(mins)

Area(ha)

Time(mins)

Area(ha)

Time(mins)

Area(ha)

0-4 0.605 4-8 1.113 8-12 0.077




PN Length(m)

Fall(m)

Slope(1:X)

I.Area(ha)

T.E.(mins)

BaseFlow (l/s)

k(mm)

HYDSECT

DIA(mm)

1.000 47.600 0.595 80.0 0.193 5.00 0.0 0.600 o 525


PN Rain(mm/hr)

T.C.(mins)

US/IL(m)

Σ I.Area(ha)

Σ BaseFlow (l/s)

Foul(l/s)

Add Flow(l/s)

Vel(m/s)

Cap(l/s)

Flow(l/s)

1.000 50.00 5.32 43.625 0.193 0.0 0.0 0.0 2.51 542.5 26.1




PN Length(m)

Fall(m)

Slope(1:X)

I.Area(ha)

T.E.(mins)

BaseFlow (l/s)

k(mm)

HYDSECT

DIA(mm)

1.001 87.200 0.396 220.0 0.350 0.00 0.0 0.600 o 525

2.000 89.800 0.544 165.0 0.248 5.00 0.0 0.600 o 4502.001 95.400 0.398 240.0 0.117 0.00 0.0 0.600 o 4502.002 26.900 0.112 240.0 0.129 0.00 0.0 0.600 o 450

1.002 16.600 0.024 700.0 0.186 0.00 0.0 0.600 o 7501.003 50.800 0.073 700.0 0.000 0.00 0.0 0.600 o 750

3.000 36.500 0.215 170.0 0.274 5.00 0.0 0.600 o 450

4.000 29.200 0.365 80.0 0.139 5.00 0.0 0.600 o 225

5.000 28.895 0.361 80.0 0.113 5.00 0.0 0.600 o 225

3.001 18.600 0.078 240.0 0.046 0.00 0.0 0.600 o 450

1.004 7.300 0.010 700.0 0.000 0.00 0.0 0.600 o 7501.005 45.100 0.064 700.0 0.000 0.00 0.0 0.600 o 750


PN Rain(mm/hr)

T.C.(mins)

US/IL(m)

Σ I.Area(ha)

Σ BaseFlow (l/s)

Foul(l/s)

Add Flow(l/s)

Vel(m/s)

Cap(l/s)

Flow(l/s)

1.001 50.00 6.28 43.030 0.543 0.0 0.0 0.0 1.51 326.0 73.5

2.000 50.00 5.95 44.737 0.248 0.0 0.0 0.0 1.58 251.3 33.62.001 50.00 7.16 44.193 0.365 0.0 0.0 0.0 1.31 208.0 49.42.002 50.00 7.51 43.795 0.494 0.0 0.0 0.0 1.31 208.0 66.9

1.002 50.00 7.77 42.409 1.223 0.0 0.0 0.0 1.05 463.9 165.61.003 50.00 8.58 42.385 1.223 0.0 0.0 0.0 1.05 463.9 165.6

3.000 50.00 5.39 44.350 0.274 0.0 0.0 0.0 1.56 247.5 37.1

4.000 50.00 5.33 44.550 0.139 0.0 0.0 0.0 1.46 58.2 18.8

5.000 50.00 5.33 44.575 0.113 0.0 0.0 0.0 1.46 58.2 15.3

3.001 50.00 5.63 43.960 0.572 0.0 0.0 0.0 1.31 208.0 77.5

1.004 50.00 8.69 42.312 1.795 0.0 0.0 0.0 1.05 463.9 243.11.005 50.00 9.41 42.302 1.795 0.0 0.0 0.0 1.05 463.9 243.1




MHName

MHCL (m)

MHDepth(m)

MHConnection

MHDiam.,L*W

(mm)PN

Pipe OutInvert


PNPipes InInvert


Backdrop(mm)

SW1 44.850 1.225 Open Manhole 1500 1.000 43.625 525

SW2 45.600 2.570 Open Manhole 1500 1.001 43.030 525 1.000 43.030 525

SW4 45.887 1.150 Open Manhole 1350 2.000 44.737 450

SW5 46.000 1.807 Open Manhole 1350 2.001 44.193 450 2.000 44.193 450

SW5A 45.975 2.180 Open Manhole 1350 2.002 43.795 450 2.001 43.795 450

SW3 45.829 3.420 Open Manhole 1800 1.002 42.409 750 1.001 42.634 525

2.002 43.683 450 975

SW6 45.800 3.415 Open Manhole 1800 1.003 42.385 750 1.002 42.385 750

SW7 45.500 1.150 Open Manhole 1350 3.000 44.350 450

SW9 45.475 0.925 Open Manhole 1200 4.000 44.550 225

SW10 45.500 0.925 Open Manhole 1200 5.000 44.575 225

SW8 45.550 1.590 Open Manhole 1350 3.001 43.960 450 3.000 44.135 450 175

4.000 44.185 225

5.000 44.214 225 29

SW11 45.500 3.188 Open Manhole 1800 1.004 42.312 750 1.003 42.312 750

3.001 43.883 450 1270

SW12P 45.500 3.198 Open Manhole 2100 1.005 42.302 750 1.004 42.302 750




Upstream Manhole


PN HydSect

Diam(mm)

MHName

C.Level(m)

I.Level(m)

D.Depth(m)

MHConnection

MH DIAM., L*W(mm)




3.000 o 450 SW7 45.500 44.350 0.700 Open Manhole 1350

4.000 o 225 SW9 45.475 44.550 0.700 Open Manhole 1200

5.000 o 225 SW10 45.500 44.575 0.700 Open Manhole 1200

3.001 o 450 SW8 45.550 43.960 1.140 Open Manhole 1350


Downstream Manhole

PN Length(m)

Slope(1:X)

MHName

C.Level(m)

I.Level(m)

D.Depth(m)

MHConnection

MH DIAM., L*W(mm)




3.000 36.500 170.0 SW8 45.550 44.135 0.965 Open Manhole 1350

4.000 29.200 80.0 SW8 45.550 44.185 1.140 Open Manhole 1350

5.000 28.895 80.0 SW8 45.550 44.214 1.111 Open Manhole 1350

3.001 18.600 240.0 SW11 45.500 43.883 1.168 Open Manhole 1800





OutfallPipe Number

OutfallName

C. Level(m)

I. Level(m)

MinI. Level

(m)

D,L(mm)

W(mm)

1.005 SW26 45.000 42.237 43.750 1200 0

















0.100 13.5000 0.900 13.5000 1.700 13.5000 2.500 0.00000.200 13.5000 1.000 13.5000 1.800 13.5000 2.600 0.00000.300 13.5000 1.100 13.5000 1.900 13.5000 2.700 0.00000.400 13.5000 1.200 13.5000 2.000 13.5000 2.800 0.00000.500 13.5000 1.300 13.5000 2.100 0.0000 2.900 0.00000.600 13.5000 1.400 13.5000 2.200 0.0000 3.000 0.00000.700 13.5000 1.500 13.5000 2.300 0.00000.800 13.5000 1.600 13.5000 2.400 0.0000







0.000 1058.0 0.0 2.001 0.0 0.02.000 1058.0 0.0 2.600 0.0 0.0


PN US/MHName

US/MHHeadloss














Inertia Status OFF


720, 960, 1440, 2160, 2880, 4320, 5760,7200, 8640, 10080



ClimateChange

First XSurcharge

First YFlood

First ZOverflow

O/FAct.

LvlExc.

1.000 15 Winter 30 0%1.001 240 Winter 30 0%2.000 15 Winter 30 0%2.001 15 Winter 30 0%2.002 15 Winter 30 0%1.002 240 Winter 30 0% 30/15 Summer1.003 240 Winter 30 0% 30/15 Summer3.000 15 Winter 30 0%4.000 15 Winter 30 0% 30/15 Winter5.000 15 Winter 30 0%3.001 15 Winter 30 0% 30/15 Summer1.004 120 Winter 30 0% 30/15 Summer1.005 120 Winter 30 0% 30/15 Summer




PNUS/MHName

WaterLevel(m)

Surch'edDepth (m)

FloodedVolume(m³)

Flow /Cap.

O'flow(l/s)


1.000 SW1 43.766 -0.384 0.000 0.16 0.0 76.2 OK1.001 SW2 43.472 -0.083 0.000 0.11 0.0 34.7 OK2.000 SW4 44.941 -0.246 0.000 0.40 0.0 95.3 OK2.001 SW5 44.475 -0.168 0.000 0.66 0.0 130.6 OK2.002 SW5A 44.143 -0.102 0.000 0.95 0.0 167.0 OK1.002 SW3 43.475 0.316 0.000 0.39 0.0 83.9 SURCHARGED1.003 SW6 43.474 0.339 0.000 0.54 0.0 212.9 SURCHARGED3.000 SW7 44.578 -0.222 0.000 0.50 0.0 108.0 OK4.000 SW9 44.810 0.035 0.000 0.96 0.0 52.2 SURCHARGED5.000 SW10 44.734 -0.066 0.000 0.82 0.0 44.5 OK3.001 SW8 44.463 0.053 0.000 1.33 0.0 220.4 SURCHARGED1.004 SW11 44.262 1.199 0.000 0.34 0.0 103.0 SURCHARGED1.005 SW12P 44.265 1.213 0.000 0.03 0.0 13.5 SURCHARGED














Time(mins)

Area(ha)

Time(mins)

Area(ha)

Time(mins)

Area(ha)

0-4 0.605 4-8 1.113 8-12 0.077




PN Length(m)

Fall(m)

Slope(1:X)

I.Area(ha)

T.E.(mins)

BaseFlow (l/s)

k(mm)

HYDSECT

DIA(mm)

1.000 47.600 0.595 80.0 0.193 5.00 0.0 0.600 o 525


PN Rain(mm/hr)

T.C.(mins)

US/IL(m)

Σ I.Area(ha)

Σ BaseFlow (l/s)

Foul(l/s)

Add Flow(l/s)

Vel(m/s)

Cap(l/s)

Flow(l/s)

1.000 50.00 5.32 43.625 0.193 0.0 0.0 0.0 2.51 542.5 26.1




PN Length(m)

Fall(m)

Slope(1:X)

I.Area(ha)

T.E.(mins)

BaseFlow (l/s)

k(mm)

HYDSECT

DIA(mm)

1.001 87.200 0.396 220.0 0.350 0.00 0.0 0.600 o 525

2.000 89.800 0.544 165.0 0.248 5.00 0.0 0.600 o 4502.001 95.400 0.398 240.0 0.117 0.00 0.0 0.600 o 4502.002 26.900 0.112 240.0 0.129 0.00 0.0 0.600 o 450

1.002 16.600 0.024 700.0 0.186 0.00 0.0 0.600 o 7501.003 50.800 0.073 700.0 0.000 0.00 0.0 0.600 o 750

3.000 36.500 0.215 170.0 0.274 5.00 0.0 0.600 o 450

4.000 29.200 0.365 80.0 0.139 5.00 0.0 0.600 o 225

5.000 28.895 0.361 80.0 0.113 5.00 0.0 0.600 o 225

3.001 18.600 0.078 240.0 0.046 0.00 0.0 0.600 o 450

1.004 7.300 0.010 700.0 0.000 0.00 0.0 0.600 o 7501.005 45.100 0.064 700.0 0.000 0.00 0.0 0.600 o 750


PN Rain(mm/hr)

T.C.(mins)

US/IL(m)

Σ I.Area(ha)

Σ BaseFlow (l/s)

Foul(l/s)

Add Flow(l/s)

Vel(m/s)

Cap(l/s)

Flow(l/s)

1.001 50.00 6.28 43.030 0.543 0.0 0.0 0.0 1.51 326.0 73.5

2.000 50.00 5.95 44.737 0.248 0.0 0.0 0.0 1.58 251.3 33.62.001 50.00 7.16 44.193 0.365 0.0 0.0 0.0 1.31 208.0 49.42.002 50.00 7.51 43.795 0.494 0.0 0.0 0.0 1.31 208.0 66.9

1.002 50.00 7.77 42.409 1.223 0.0 0.0 0.0 1.05 463.9 165.61.003 50.00 8.58 42.385 1.223 0.0 0.0 0.0 1.05 463.9 165.6

3.000 50.00 5.39 44.350 0.274 0.0 0.0 0.0 1.56 247.5 37.1

4.000 50.00 5.33 44.550 0.139 0.0 0.0 0.0 1.46 58.2 18.8

5.000 50.00 5.33 44.575 0.113 0.0 0.0 0.0 1.46 58.2 15.3

3.001 50.00 5.63 43.960 0.572 0.0 0.0 0.0 1.31 208.0 77.5

1.004 50.00 8.69 42.312 1.795 0.0 0.0 0.0 1.05 463.9 243.11.005 50.00 9.41 42.302 1.795 0.0 0.0 0.0 1.05 463.9 243.1




MHName

MHCL (m)

MHDepth(m)

MHConnection

MHDiam.,L*W

(mm)PN

Pipe OutInvert


PNPipes InInvert


Backdrop(mm)

SW1 44.850 1.225 Open Manhole 1500 1.000 43.625 525

SW2 45.600 2.570 Open Manhole 1500 1.001 43.030 525 1.000 43.030 525

SW4 45.887 1.150 Open Manhole 1350 2.000 44.737 450

SW5 46.000 1.807 Open Manhole 1350 2.001 44.193 450 2.000 44.193 450

SW5A 45.975 2.180 Open Manhole 1350 2.002 43.795 450 2.001 43.795 450

SW3 45.829 3.420 Open Manhole 1800 1.002 42.409 750 1.001 42.634 525

2.002 43.683 450 975

SW6 45.800 3.415 Open Manhole 1800 1.003 42.385 750 1.002 42.385 750

SW7 45.500 1.150 Open Manhole 1350 3.000 44.350 450

SW9 45.475 0.925 Open Manhole 1200 4.000 44.550 225

SW10 45.500 0.925 Open Manhole 1200 5.000 44.575 225

SW8 45.550 1.590 Open Manhole 1350 3.001 43.960 450 3.000 44.135 450 175

4.000 44.185 225

5.000 44.214 225 29

SW11 45.500 3.188 Open Manhole 1800 1.004 42.312 750 1.003 42.312 750

3.001 43.883 450 1270

SW12P 45.500 3.198 Open Manhole 2100 1.005 42.302 750 1.004 42.302 750




Upstream Manhole


PN HydSect

Diam(mm)

MHName

C.Level(m)

I.Level(m)

D.Depth(m)

MHConnection

MH DIAM., L*W(mm)




3.000 o 450 SW7 45.500 44.350 0.700 Open Manhole 1350

4.000 o 225 SW9 45.475 44.550 0.700 Open Manhole 1200

5.000 o 225 SW10 45.500 44.575 0.700 Open Manhole 1200

3.001 o 450 SW8 45.550 43.960 1.140 Open Manhole 1350


Downstream Manhole

PN Length(m)

Slope(1:X)

MHName

C.Level(m)

I.Level(m)

D.Depth(m)

MHConnection

MH DIAM., L*W(mm)




3.000 36.500 170.0 SW8 45.550 44.135 0.965 Open Manhole 1350

4.000 29.200 80.0 SW8 45.550 44.185 1.140 Open Manhole 1350

5.000 28.895 80.0 SW8 45.550 44.214 1.111 Open Manhole 1350

3.001 18.600 240.0 SW11 45.500 43.883 1.168 Open Manhole 1800





OutfallPipe Number

OutfallName

C. Level(m)

I. Level(m)

MinI. Level

(m)

D,L(mm)

W(mm)

1.005 SW26 45.000 42.237 43.750 1200 0

















0.100 13.5000 0.900 13.5000 1.700 13.5000 2.500 0.00000.200 13.5000 1.000 13.5000 1.800 13.5000 2.600 0.00000.300 13.5000 1.100 13.5000 1.900 13.5000 2.700 0.00000.400 13.5000 1.200 13.5000 2.000 13.5000 2.800 0.00000.500 13.5000 1.300 13.5000 2.100 0.0000 2.900 0.00000.600 13.5000 1.400 13.5000 2.200 0.0000 3.000 0.00000.700 13.5000 1.500 13.5000 2.300 0.00000.800 13.5000 1.600 13.5000 2.400 0.0000







0.000 1058.0 0.0 2.001 0.0 0.02.000 1058.0 0.0 2.600 0.0 0.0


PN US/MHName

US/MHHeadloss














Inertia Status OFF


720, 960, 1440, 2160, 2880, 4320, 5760,7200, 8640, 10080



ClimateChange

First XSurcharge

First YFlood

First ZOverflow

O/FAct.

LvlExc.

1.000 15 Winter 100 +20%1.001 15 Winter 100 +20% 100/15 Summer2.000 15 Winter 100 +20%2.001 15 Winter 100 +20% 100/15 Summer2.002 15 Winter 100 +20% 100/15 Summer1.002 240 Winter 100 +20% 100/15 Summer1.003 240 Winter 100 +20% 100/15 Summer3.000 15 Winter 100 +20% 100/15 Summer4.000 15 Winter 100 +20% 100/15 Summer5.000 15 Winter 100 +20% 100/15 Summer3.001 15 Winter 100 +20% 100/15 Summer1.004 30 Summer 100 +20% 100/15 Summer1.005 30 Summer 100 +20% 100/15 Summer




PNUS/MHName

WaterLevel(m)

Surch'edDepth (m)

FloodedVolume(m³)

Flow /Cap.

O'flow(l/s)


1.000 SW1 44.116 -0.034 0.000 0.27 0.0 127.9 OK1.001 SW2 44.072 0.517 0.000 1.13 0.0 344.4 SURCHARGED2.000 SW4 45.108 -0.079 0.000 0.72 0.0 170.2 OK2.001 SW5 44.853 0.211 0.000 1.07 0.0 210.6 SURCHARGED2.002 SW5A 44.371 0.126 0.000 1.51 0.0 266.7 SURCHARGED1.002 SW3 43.872 0.713 0.000 0.59 0.0 126.0 SURCHARGED1.003 SW6 43.870 0.735 0.000 0.61 0.0 240.9 SURCHARGED3.000 SW7 44.908 0.108 0.000 0.87 0.0 189.8 SURCHARGED4.000 SW9 45.475 0.700 0.000 1.50 0.0 81.2 SURCHARGED5.000 SW10 45.444 0.644 0.000 1.37 0.0 74.1 SURCHARGED3.001 SW8 44.744 0.334 0.000 2.21 0.0 366.3 SURCHARGED1.004 SW11 44.542 1.480 0.000 0.39 0.0 116.1 SURCHARGED1.005 SW12P 44.610 1.558 0.000 0.03 0.0 13.5 SURCHARGED

appendix k – flood evacuation plan p 2014 01128 revised flood risk assessment …...

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