drainage strategy

Issue Number 02

02.03.18

Drainage Strategy

for

Long Lawford Primary School

Warwickshire County Council

Drainage Strategy

MJC/KJD/171541/17-2 Reports/Drainage Strategy - Issue Number 02

Document History

Issue Date Comment Author Chk’d

01 25.01.18 First Issue KJD ART

02 02.03.18 Second Issue KJD ART

Drainage Strategy


Contents

1.0 Introduction ........................................................................................................... 1

2.0 Site Setting ............................................................................................................ 1

Site Description and Location 1

Proposed Development 1

3.0 Existing Drainage .................................................................................................. 2

Foul 2

Surface Water 2

4.0 Proposed Drainage Surface Water ..................................................................... 3

5.0 Proposed Drainage – Southwest Discharge Points ........................................... 3

Foul Drainage 3

Surface Water Drainage 4

6.0 Proposed Drainage – Northwest Discharge Points........................................... 5

Foul Drainage 5

Surface Water 5

7.0 Windes Calculations ............................................................................................. 6

8.0 Rainwater Harvesting ........................................................................................... 6

9.0 Pollution Control .................................................................................................. 6

10.0 In the Event of a System Failure ......................................................................... 6

Surface Water Network - Southwest Discharge Point 6

Surface Water Network - Northwest Discharge Point 7

11.0 Severn Trent Water Pre-Development Application ........................................ 7

Appendix A 8

Existing Peak Foul Flow calculations in accordance with BSEN 12506-2 8

Appendix B 9

Seven Trent Water Asset Management Drawing 9

Appendix C 10

Brownfield Peak Discharge Rate Calculations for the Existing Surface Water Run-off. 10

Appendix D 11

Green Field Run off Rate – UK SuDs 11

Appendix E 12

Proposed Southwest Peak Foul Flow calculations in accordance with BS EN 12506-2 12

Appendix F 13

Proposed Southwest Drainage Drawing – Tender 13

Appendix G 14

Proposed Surface Water Storage Tank – Tender 14

Drainage Strategy


Appendix H 15

Proposed Northwest Peak Foul Flow calculations in accordance with BS EN 12506-2 15

Appendix I 16

Proposed Northwest Drainage Drawing – Tender 16

Appendix J 17

Windes Calculations 17

Appendix K 17

Overland Flooding Route For The Surface Water 17

Drainage Strategy

1 MJC/KJD/171541/17-2 Reports/Drainage Strategy - Issue Number 02

1.0 Introduction

Re-developing Long Lawford Primary School will create a new, modern, spacious building

for its students and staff.

This drainage strategy provides details of the drainage proposals associated with the

development on the site, as designed by Warwickshire County Council. It also outlines the

existing drainage system and how this will be affected by the proposed works.

2.0 Site Setting

Site Description and Location

The site is located off Holbrook Road in Long Lawford, which is approximately 2.5km east

of the centre of Rugby. The site is approximately centred on National Grid Reference

447560, 276060.

The site covers an area of approximately 1.6ha comprising of a series of school buildings

and playing fields, hard surfaces and landscaping. The main buildings and hard surfaces

generally occupy the northern part of the site with one block extending into the south-

western area. The main playing fields are in the southeast of the site but there are also soft

ground/grass areas in the southwest and northwest areas. The area surrounding the site is

dominated by residential properties and public open space.

Proposed Development

The proposed development comprises a number of extensions, the largest being a new 2-

storey block in the west of the site, together with the expansion of car-parking and

playground provision. The new block will have a footprint of approximately 350m2 and the

combined footprint of all the smaller new extensions will be approximately 150m2.

The playground expansion will cover an area of approximately 650m2 whilst the car-park

expansion will largely be achieved by re-configuring the existing carpark and playground

layout and will result in minimal additional hard surfacing.

The proposed layout is shown in Figure 1 below.

Drainage Strategy


Figure 1 Proposed Site Layout

3.0 Existing Drainage

A topographical survey and below ground utilities tracing were undertaken by Midlands

Survey Ltd in January 2016. The below ground utilities survey identified that there are

separate dedicated drainage systems for the existing surface water and foul sewerage.

Foul

The existing foul drainage network discharges from site through two points to the west.

One discharge point is to the northwest, adjacent to Playground 3 and the second is to the

southwest next to the Key Stage 2 building.

An existing peak foul sewage flow of 3.5l/s has been calculated to flow out via the

southwest discharge point and an existing peak foul sewage of 4.9l/s has been calculated to

flow out via the northwest discharge point. These values have been calculated in

accordance with BS EN 12506-2 based upon the number of appliances present as shown on

the existing plans provided by Warwickshire County Council. These calculations are

included in Appendix A.

Surface Water

There is a separate surface water drainage system serving most of the buildings and hard

surfaced areas on the site. Surface water leaves the site via two discharge points, one

situated to the northwest and the other to the southwest of the site. Both discharge points

are assumed to connect into a culverted watercourse owned by Severn Trent Water. The

Key Stage 2

Extension Key Stage 2

Building

Play

Ground 2

Extension

Car Park

Extension

Early Years

Extension

Play

Ground 3

Drainage Strategy


culverted watercourse runs alongside Long Lawford Primary School as shown on the

Severn Trent Water asset management plan included in Appendix B.

The calculated peak brownfield discharge rate for the existing site has been calculated using

the rational method. Approximately 19.1 l/s discharges through the southwest discharge

point and 33.3l/s through the northwest. These values represent the 1 in 1 year storm

event. The calculations for this are included in Appendix C.

4.0 Proposed Drainage - Surface Water

Infiltration testing was undertaken on 20 November 2017. The infiltration tests were

carried out in accordance with BRE digest 365. The tests proved that the ground is not

suitable for drainage by infiltration as the water level in the three trial pits did not decrease

discernibly over a period of two hours.

Warwickshire County Council Strategic Flood Risk Assessment (SFRA) states “Surface

water runoff from all new developments should be attenuated to the Greenfield runoff rate for

equivalent rainfall events up to and including the 1 in 100 year plus climate change.” The

greenfield run off rate has been calculated using the UK SUDs Greenfield Runoff Calculator.

The catchment area for the existing site is 0.1484 ha. The results are included in Appendix

D and summarised in Table 1 below.

Qbar (l/s) 0.64

1 in 1 year (l/s) 0.53

1 in 30 year (l/s) 1.29

1 in 100 year (l/s) 1.65 Table 1 Greenfield Run-off Rate Calculations

As restricting the run-off to the greenfield rates given above would require the flow to be

controlled to a rate well below the minimum practical piped controlled discharge of 5l/s the

Lead Local Flood Authority for Warwickshire has agreed that development run off rates

can be restricted 2.15l/s for the 1 in 1 year storm event, 5.85l/s for the 1 in 30 year event

and 1 in 100 year event with a 40% uplift for Climate change. This is based on using the

minimum recommended orifice diameter of 50mm.

1 in 1 year (l/s) 2.15

1 in 30 year (l/s) 5.85

1 in 100 year +40% CC (l/s) 5.85 Table 2 Proposed Discharge Rate for Surface Water Run-off

5.0 Proposed Drainage – Southwest Discharge Points

Foul Drainage

A new foul drainage system will be installed to serve the new two-storey Key-Stage 2

building extension. A new section of 150mm diameter foul sewer will be installed between

two existing manholes to the west of the existing building. The flow will gravitate to the

existing southwest discharge point on the foul drainage system.

A peak foul sewage flow of 3.2l/s from the proposed building has been calculated in

accordance with BS EN 12506-2 based upon the number of appliances to be installed in the

building. Therefore, a total peak foul flow of 6.7l/s will discharge from the southwest

discharge point, post development. The calculations for this are included in Appendix E.

The Proposed Drainage Drawing can be found in Appendix F.

Drainage Strategy


Foul Capacity Check

Using the invert levels and manhole positions as shown on the topographical survey, the

gradient and pipe capacity of the existing sewers has been calculated. The 100mm diameter

foul outlet pipe has a capacity of 13.1l/s. The post development flow is calculated to be

6.7l/s and therefore the existing pipe has sufficient capacity for the new extensions.

Surface Water Drainage

The proposed Key-Stage 2 building extension will cover an area of 0.0380ha. The surface

water runoff from the extension will drain by gravity and discharge to two new

underground tanks. Each tank will measure 2.4m by 3.4m on plan and have a capacity of

7,500 litres. Details of these tanks can be seen on the drawing included in Appendix I. The

depth of cover from finished ground level to the top of tank will be in line with the

manufacturer’s specification for a tank in a non-vehicle area.

The tanks will be fitted with a submersible pump that will pump the stored stormwater into

the surface water system via a 100mm pipe at a maximum rate of 1.15 l/s. The underground

tanks will accommodate the 1 in 30-year storm without flooding. However, during the 1 in

100 storm + 40% uplift for climate change the tank will flood by approximately 0.646m3 and

manhole SWIC03 will flood by 3.326m3. The depth of floodwater around the tanks will be

less than 10mm across an area of 65m2 and the depth of floodwater around SWIC03 will be

less than 50mm across an area of 70m2.

The depths of the floodwater are very small and the topography of the site means the

floodwater will flow away from the building during a 1 in 100 + 40% storm. According to

the hazard matrix 13.1 in EA document FD2320 - Flood Risk Assessment Guidance for

New Development, for the flood water to become a danger for some the flood velocity

would need to be over 2m/s. A velocity as high as this is extremely unlikely due to the soft

landscaping and the small catchment area involved.

To demonstrate the overland route for flooding the topographical survey and building

outline drawings have been combined on Autodesk Civils 3D and a simulation undertaken.

These drawings also denote the depths and areas of the flooding during the 1 in 100 + 40%

CC and can be found in Appendix K.

The Proposed Tender Drainage Drawing can be found in Appendix F. The construction

phase drawings will be updated to state that the submersible pump is to be set to 1.15l/s.

The proposed underground storage tank details can be found in Appendix G.

Surface Water Capacity Check


gradient and pipe capacity of the existing sewers has been calculated. The existing 100mm

diameter surface water pipe has a capacity of 12.451l/s. A total peak surface water flow of

20.27 l/s will discharge through the southwest discharge point. Therefore, it is

recommended that the existing outlet pipe should be up-sized to a 150mm diameter pipe. If

the new pipe is installed at the existing gradient, it will have a capacity of 36 l/s.

Drainage Strategy


6.0 Proposed Drainage – Northwest Discharge Points

Foul Drainage

A new foul drainage system will be installed to serve the new Early Years classroom

extension. The proposed pipework will connect into the existing foul system and discharge

into the public sewer through the northwest discharge point. An additional 1.8l/s will be

discharged into the public sewer. This has been calculated in accordance with BS EN 12506-

2 based upon the number of appliances to be connected into the new system. A total peak

foul flow of 6.7l/s will discharge from the northwest discharge point. These calculations are

included in Appendix H.

The proposed tender drainage drawing can be found in Appendix I.

Foul Capacity Check


gradient and pipe capacity of the existing sewers have been calculated. The 150mm

diameter foul pipe has a capacity of 34.7l/s. Therefore, the existing pipe has sufficient

capacity for the new extensions. The construction phase drawings will be updated to reflect

this recommendation.

Surface Water

The proposed development of a new playground, car park extension and the Early Years

building will create an extra 0.11ha of impermeable area.

Runoff from the new Early Years building, 0.0148ha, will connect into the existing system

via a 100mm diameter pipe. The carpark extension will drain into a series of gullies and land

drains which will connect via an oil interceptor into the proposed attenuation tank. The

proposed playground will also drain via land drains to the proposed attenuation tank. The

proposed playground and car park extension equate to 0.092ha.

The proposed attenuation tank will consist of a geo-cellular tank surrounded by an

impermeable membrane which will provide storage for up to 22.8m3. The depth of cover

from finished ground level to the top of tank is to be in line with the manufacturer’s

specification. An orifice plate will restrict the outflow of surface water to 4.7l/s during a 1 in

30 and 1 in 100 + 40% CC storm. However, during the 1 in 100 +40% CC storm manhole

SW IC 04 and Silt trap manhole will together flood a total of 18.433m3. The depth of

floodwater across the 600m2 playground will be no more than 31mm. The floodwater

would stay within the playground and ultimately flow into the soft landscaping around the

playground. There would therefore be no risk to the surrounding buildings. According to

the hazard matrix 13.1, in EA document FD2320 - Flood Risk Assessment Guidance for

New Development for the floodwater to become a danger for some, the floodwater would

need to be above 4m/s. This high velocity is very unlikely due to the small catchment area

involved.

Overland flooding routing is shown on drawings for the northwest discharge point in

Appendix K.

The proposed tender drainage drawings can be found in Appendix I. The construction

phase drawings will be updated to state that attenuation storage should be increased to

22.8m3. Furthermore, the drawings will state that a 50mm diameter orifice will be installed

Drainage Strategy


on the tank outlet,to restrict the flow to 4.7l/s for the 1 in 30 and 1 in 40 + 40% CC storm

events.

Surface Water Capacity Check


gradient and pipe capacity of the existing sewers has been calculated. The 150mm diameter

surface water pipe has a capacity of 53.7l/s. A total peak surface water flow of 37.7l/s will

discharge from the northwest discharge point. Therefore, the existing pipe has sufficient

capacity for the new extensions.

7.0 Windes Calculations

The proposed drainage network has been input into WinDes drainage simulation software.

The 1 in 1 year, 1 in 2 year, 1 in 30 year and 1in 100 + 40% climate change events have

been simulated. The network has been split in to two Windes files for each discharge point.

The Windes calculations can be found in Appendix J including a marked up drawing

indicating the manhole labels that have been used within the software.

8.0 Rainwater Harvesting

Rainwater harvesting has been considered but deemed not economically viable due to the

small number of new toilets in the proposed development.

9.0 Pollution Control

Two new oil interceptors will treat the surface water runoff from the proposed carpark

extension before it is discharged into the new attenuation tank.

10.0 In the Event of a System Failure

Surface Water Network - Southwest Discharge Point

In the unlikely event of a system failure due to a blockage or failure of the submersible

pumps, approximately 16.725m3 of floodwater would surcharge the manholes and flood the

surrounding landscape. This is based upon the 1 in 100 + 40% CC storm event. This has

been calculated using Windes and can be seen in the calculations in Appendix J.

To demonstrate the overland route for flooding the topographical survey and building

outline drawings have been combined on Autodesk Civils 3D and a simulation undertaken.

As indicated on the drawing in Appendix K the floodwater flows to the lower points of soft

landscaping locally. The floodwater would stay within this area until it dissipates or flows

back into the surface water drainage network. The depth of the water in this area would be

no more than 130mm during a 1 in 100 +40% CC storm event.

In reality due to the small flow rates within the southwest surface water system it is very

unlikely that the manhole cover would be pushed up and out of its frame. The floodwater

would discharge from the small holes in the manhole cover, around the cover seal and then

back up through the system and surcharge the upstream manholes in a similar fashion.

Drainage Strategy


Surface Water Network - Northwest Discharge Point

In the event of a system failure due to a blockage or failure of the geo-cellular attenuation

tank, approximately 42m3 of floodwater would surcharge the manholes. 0.4m3 from SW

IC01, 7.658 from SWIC01 and 33.780 from SW Silt Trap 1.This has been calculated using

Windes based upon the 1 in 100 + 40% CC storm event. The depth of floodwater across

the new playground will be no more than 70mm. The floodwater would either stay within

the playground or flow into the soft landscaping around the playground. There would

therefore be no risk to the surrounding buildings.

11.0 Severn Trent Water Pre-Development Application

A Pre-development Application has been submitted to Severn Trent Water and a response

is waited

Drainage Strategy


Appendix A Existing Peak Foul Flow calculations in accordance with BSEN 12506-2

A1: Existing peak foul flow for the northwest discharge point

A2: Existing peak foul flow for the southwest discharge point

########

BUILDING FOUL DRAINAGEBS EN 12506-2:2000 - SYSTEM III

Scheme:

Ref: 171541

Building:

K

Frequency Factor:Frequent 0.7 e.g. Hospital, school, restaurant, hotel

Discharge

Appliance Unit (DU) No. Sum DUs Flow

(l/s)

I had a look Kerry

WC 1.7 21 35.7 4.182

Basin 0.3 18 5.4 1.627

Sink 1.3 6 7.8 1.955

Urinal 0.4 2 0.8 0.626

Other: 0 0.000

Sum 49.7 4.93 l/s

Exsiting Foul Drainage through the North Discharge Point


########


Scheme:

Ref: 171541

Building:

K


Discharge


(l/s)

WC 1.7 7 11.9 2.415

Basin 0.3 8 2.4 1.084

Sink 1.3 6 7.8 1.955

Urinal 0.4 3 1.2 0.767

Floor Gully 50mm 0.8 2 1.6 0.885

Other: 0 0.000

Sum 24.9 3.49 l/s

Existing discharge through the south discharge point


Drainage Strategy


Appendix B

Seven Trent Water Asset Management Drawing

Public foulgravity

Publiccombinedgravity

Public surfacewater gravity

Pressurisedfoul

Pressurisedcombined

Pressurisedsurface water

Section 104 sewers areshown in green

Private sewers are shownin magenta

All NonSewer Standard(NSS) Lateral Drains areshown in Orange

Abandonedsewer

Culvertedwatercourse

Highway drain

Manhole foul /combined

Manhole surfacewater

Duct

Lamphole Blind shaft Head nodeOverflow Outfall

Combined Lateral Drain (SS) High voltagecable

Foul Lateral Drain (SS) Low voltagecable

Surface Water Lateral Drain (SS) Instrumentation

Severn Trent Water Limited Asset Data Management PO Box 5344 Coventry CV3 9FT Telephone: 0845 601 6616

Sewer RecordO/S Map scale: Approx. 1:1250 This map is centered upon

OS Grid Ref:x 447549.0 y 275995.0Date of Issue: 25 11 2015

Do not scale off this drawing

1. This plan and any information supplied with it is furnished as a general guide, is only validat the date of issue and no warranty as to its correctness is given or implied. In particularthis plan and any information shown on it must not be relied upon in the event of anydevelopment or works (including but not limited to excavations) in the vicinity of SevernTrent's assets or for the purposes of determining the suitability of a point of connection tothe sewerage or distribution systems.

2. The material contained in this drawing has been based upon the Ordnance Survey Map bySEVERN TRENT WATER Ltd. by permission of Ordnance Survey on behalf of thecontroller of her Majesty's Stationery Office. © Crown Copyright â€“ SEVERN TRENTWATER Ltd. â€“ 100018202

3. Document users other than SEVERN TRENT WATER business users are advised that thisdocument is provided for reference purpose only and no further copies should be made.

Drainage Strategy


Appendix C

Brownfield Peak Discharge Rate Calculations for the Existing Surface Water Run-off.

Northwest Discharge Point Peak run-off rates from the site in its pre-development form have been estimated assuming 100% run-off from hard surfaces and 0% run-off from pervious areas, using the Rational Method as follows; Q = 2.78CiA where; Q - Flow Rate (l/s) C – Run-off Coefficient (which assuming 100% run-off is 1) i – Rainfall intensity (mm/hr) A – Catchment Area (area under hardcover)(ha) The rainfall intensity has been taken as 50mm/hr. The catchment area for the northwest discharge

point has been calculated to be 0.24ha. This area includes all of the impermeable area that is being

drained into the existing surface water network.

𝑄 = 2.78 × 1 × 50 × 0.24 = 33.36 𝑙/𝑠

Southwest Discharge Point

The rainfall intensity has been taken as 50mm/hr. The catchment area for the southwest discharge

point has been calculated to be 0.0.138ha. This area includes all of the impermeable area that is being

drained into the existing surface water network.

𝑄 = 2.78 × 1 × 50 × 0.138 = 19.129 𝑙/𝑠

Drainage Strategy


Appendix D

Green Field Run off Rate – UK SuDs

This report was produced using the greenfield runoff tool developed by HR Wallingford and available at www.uksuds.com. The use of this tool is subject to the UK SuDS terms and conditions and licence agreement, which can both be found at http://uksuds.com/terms-and-conditions.htm. The outputs from this tool have been used to estimate storage volume requirements. The use of these results is the responsibility of the users of this tool. No liability will be accepted by HR Wallingford, the Environment Agency, CEH, Hydrosolutions or any other organisation for use of this data in the design or operational characteristics of any drainage scheme.

Greenfield runoff estimation for sites

www.uksuds.com │ Greenfield runoff tool

This is an estimation of the greenfield runoff rate limits that are needed to meet normal best practice criteria in line with Environment Agency guidance “Preliminary rainfall runoff management for developments”, W5-074/A/TR1/1 rev. E (2012) and the SuDS Manual, C753 (Ciria, 2015). This information on greenfield runoff rates may be the basis for setting consents for the drainage of surface water runoff from sites.

Site name:

Calculated by:

Latitude:

Longitude:

Reference:

Date:

Site coordinates

Site location:

Site characteristicsTotal site area (ha)

MethodologyQbar estimation methodSPR estimation method

Default Edited

SOIL typeHOST classSPR/SPRHOST

Hydrological characteristics Default Edited

SAAR (mm)Hydrological region Growth curve factor: 1 year Growth curve factor: 30 year Growth curve factor: 100 year

Notes:(1) Is QBAR < 2.0 l/s/ha?

(2) Are flow rates < 5.0 l/s?

(3) Is SPR/SPRHOST ≤ 0.3?

Greenfield runoff rates Default Edited

Qbar (l/s)1 in 1 year (l/s)1 in 30 years (l/s)1 in 100 years (l/s)

Methodology IH124

0.47

0.53

2

1.65

0.83 0.83

Lower consent flow rates may be set in which case blockage

4

0.1484

2018-01-03T11:15:31

Long Lawford, Rugby

--- 5.0l/s if blockage from vegetation and other materials is possible.

1.30313° W

0.53


0.64

Kerry Dent

2.57

0.64

Calculate from SOIL type

52.38041° N

639639

44

1.65

2.57

Calculate from SPR and SAAR

4

---

1.29 1.29

2

6192279

work must be addressed by using appropriate drainage elements.

0.47

Where flow rates are less than 5.0 l/s consents are usually set at

Drainage Strategy


Appendix E

Proposed Southwest Peak Foul Flow calculations in accordance with BS EN 12506-2

25/01/2018

BUILDING FOUL DRAINAGE BS EN 12506-2:2000 - SYSTEM III

Scheme:

Ref: 171541

Building:K

Frequency Factor: Frequent 0.7 e.g. Hospital, school, restaurant, hotel

Discharge


(l/s)

I had a look Kerry

WC 1.7 9 15.3 2.738

Basin 0.3 9 2.7 1.150

Sink 1.3 1 1.3 0.798

Floor Gully 50mm 0.8 1 0.8 0.626

Other:

Sum 20.1 3.14 l/s

Proposed Key Stage 2 Building - South Discharge Point


X001-171541-17-1- BS12056 Foul Drainage Flow SYSTEM III.xls 25/01/2018

Drainage Strategy


Appendix F

Proposed Southwest Drainage Drawing – Tender

E1: G1481 working drawing Phase 1_1_1_7845-G1481 P1 04_Key Stage 2 Building

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County Council

PHASE 1 TENDER

Proposed Ground Floor Plan

Scale 1:50

Drainage Strategy


Appendix G

Proposed Surface Water Storage Tank – Tender

G1481 working drawing Phase 1_1_1_7845-G1481 P1 18.pdf

F-Line 7500 Litres Underground

Water Tank

Product Code: DWT-FT7500

with lockable cover and VS 60

raising piece

obtain from :

Direct Water Tanks - Trading name

of Kingfisher Direct Ltd

Retford Enterprise Centre

Retford

Nottinghamshire

DN22 7GR

Main office number: 01777 237

933

Email: [email protected]

Tank 1 shall be fitted with a

stainless steel submersible pump

to allow for pumping out stored

storm water to the nearest storm

manhole. Submersible pump to be

fitted with an automatic float switch

from 100mm upto 900m. Pump

shall be a 230V unit and supplied

with an electrical power supply

from the nearest DB. Connect

plastic flexible hose to submersible

pump and discharge into outfall

100mm dia storm drain.

Submersible pump shall be fitted

with a lifting chain for maintenance

purposes.

MANHOLES PRECAST CONCRETE.

PIPES, JOINTS AND FITTINGS.

PIPE BEDDING.

GENERAL.

LAND DRAINS.

PIPE TESTING.

DRAINS PASSING THROUGH BUILDING

BACKFILL TO DRAINAGE TRENCHES.

INSPECTION CHAMBERS.

STRUCTURE.

THE FIRST 300mm OF BACKFILL SHOULD BE FREE FROM STONES

EXCEEDING 40mm (UNLESS THE GRANULAR MATERIAL EXTENDS

100mm ABOVE THE PIPE CROWN)

WHERE THE BACKFILL CONTAINS STONES LARGER THAN 40mm

OR WHERE THE DRAIN IS DEEPER THAN 2M IN POOR GROUND,

THE GRANULAR MATERIAL SHOULD EXTEND TO AT LEAST 100mm

ABOVE THE PIPE CROWN.

100mm MINIMUM BED OF

GRANULAR MATERIAL

WHEN DRAINS ARE LAID IN ROCK, COMPACTED SAND AND GRAVEL

REQUIRING MECHANICAL MEANS OF EXCAVATION AND IN VERY SOFT

OR WET GROUND, A 100mm BED SHOULD BE USED.

EACH SIDE OF DRAIN

150mm MINIMUM SIDEFILL

TYPICAL SILT TRAP DETAIL

NTS

MORTAR HAUNCHING TO MH COVER AND FRAME

COVER SLAB BEDDED ON PC CHAMBER SECTION

WITH MORTAR, PROPRIETARY BITUMEN OR RESIN

MASTIC SEALANT

CONCRETE SURROUND 150mm ST4

HIGH STRENGTH CONCRETE TOPPING TO BE

BROUGHT UPTO A DENSE SMOOTH FACE NEATLY

SHAPED AND FINISHED TO ALL BRANCH

CONNECTIONS (MINIMUM THICKNESS 20mm)

ST4 CONCRETE BASE

CLASS B ENGINEERING BRICKS CONCRETE

BLOCKS OR PRECAST CONCRETE COVER FRAME

SEATING RINGS.

MIN 2 BRICKS, MAX 4 BRICK

750x750mm OPENING IN COVER SLAB

LIFTING EYES IN CONCRETE RINGS TO BE

POINTED

BENCHING SLOPE TO BE 1 IN 10 TO 1 IN 30

BOTTOM PRECAST CONCRETE RING TO BE BUILT

INTO BASE CONCRETE MIN 75mm

DISTANCE BETWEEN TOP OF PIPE AND

UNDERSIDE OF PC CHAMBER TO BE 50mm

225mm TO BARREL OF PIPE

INVERTS FORMED USING CHANNEL PIPES

600 x 600mm recessed double

seal manhole cover with locking

point. stainless steel rims

ref: MHC-7125/DSL/SSE

from Manhole Covers UK Ltd

BRICKWORK OR CONCRETE

BLOCKS TO BE CORBELLED

TO SUIT COVER

ST4 CONCRETE

MORTAR HAUNCHING TO M.H

COVER AND FRAME

CLASS B ENGINEERING

BRICKS OR CONCRETE

BLOCKS NOT LESS THAN

200mm THICK

ARCH OVER PIPE

BENCHING SLOPE TO BE 1 IN

10 TO 1 IN 30

225mm TO BARREL OF PIPE

INVERTS TO BE FORMED

USING CHANNEL PIECES

HIGH STRENGTH CONCRETE

TOPPING MIN. 20mm THICK

Typical internal FW Manhole arrangement

SCALE 1:20

600 x 600mm recessed double

seal manhole cover with locking

point. stainless steel rims

ref: MHC-7125/DSL/SSE

from Manhole Covers UK Ltd

150mm thickness precast

manhole cover with 600 x 600

aperture

Typical external SW Manhole arrangement

SCALE 1:20

FFL 85.81

FFL 85.81

County Council

PHASE 1 TENDER

Phase 1 - storm water attenuation tank x 2

Drainage Strategy


Appendix H

Proposed Northwest Peak Foul Flow calculations in accordance with BS EN 12506-2


Scheme:

Ref: 171541

Building:

K


Discharge


(l/s)

WC 1.7 3 5.1 1.581

Basin 0.3 3 0.9 0.664

Other:

Sum 6 1.71 l/s

Early Years Class Room Extension - Into Existing Foul Network


Drainage Strategy


Appendix I

Proposed Northwest Drainage Drawing – Tender

I1: G1481 working drawing Phase 3-G1481 P3 09 Car Park Extension

I2: G1481 working drawing Phase 3-G1481 P3 10_Playground Extension

I3: G1481 working drawing Phase 4-G1481 P4 09_Early Years Extension.

I4: G1481 working drawing Phase 3-G1481 P3 11_Attenuation Tank Detail.pdf

for storage

new timber shed

Existing Staff Car Park

Caretaker

Room

Boiler

BN

d

ro

pp

ed

kerb

make good around new fence post concrete

bases with min 200mm topsoil and grass

seeding


bases with min 200mm topsoil and grass

seeding

1.2m high x 2.95m wide, Post centres @ 3.0m

Tubular construction, horizontal rails are sleeved onto the

fitting on the posts, resulting in a seamless design. Rails

50x25 RHS, Tubular infill 19mm diameter, Tube spacing

119mm centres giving 100mm gap.

galvanised with powder coat finish colour to be confirmed






galvanised with powder coat finish colour to be confirmed

300 x 300 x 400mm deep GEN3 concrete

foundations to fence posts.



approx 12ft x 8ft timber apex style s/w timber shiplap

cladded timber shed with double doors, coated in

3no. preservative coats of Cuprinol 'shades' stain col. TBC

including timber match boarded floor, and match boarded roof.

Weather proofing using mineral cap sheet fixed with galv. steel felt

nails.

base to shed shall be 600 x 600 x 50mm grey concrete slabs

on 50mm thickness 1:4 sand / cement dry mix over min 150mm well

consolidated hardcore base.

1.2m high bow top

galv. steel powder coated

pedestrian gate with strike plate, slide bolt

and hole for security padlock.

frame size 60mm x 60mm

posts 100 x 100mm set in 450 x 450 x

700mm mass concrete foundations

1.2m high bow top

galv. steel powder coated

pedestrian gate with strike plate, slide bolt

and hole for security padlock.

frame size 60mm x 60mm

posts 100 x 100mm set in 450 x 450 x

700mm mass concrete foundations

CAREFULLY TAKE DOWN AND SET ASIDE FOR REUSE THE

EXISTING BOW TOP METAL GATES INCLUDING ALL GATE

POSTS.

retain existing gully

new 50 x 150mm edging kerb






galvaninsed with powder coat finish colour to be confirmed




bases with hardcore and tarmacadam to match existing

levels

backfill between kerbs with min 200mm of

good quality topsoil and amenity type

grass seed

reinstate disturbed grass margin with min 200mm of

good quality topsoil and amenity type

grass seed

COATED MACADAM PAVINGto paths and foot traffic area around proposed

buildings

Standard: To BS 4987-1 and -2.

Granular sub-base: Compacted thickness: 150 mm.

Binder course: 0/20 mm aggregate size dense binder course

Compacted thickness: 40 mm.

Surface course: 0/6 mm aggregate size medium graded surface course.


B

D2

+

86.235

+

FFL 86.250

+ 86.200

+ 86.030

+ 85.860

+ 85.690

+

FFL 86.250

1

2

3

Studio Hall

St.

St.

Corridor

D1

D3

W1

W2

W3

81m2

D4

D5

C

C

new full kerb height



new

fu

ll kerb

h

eig

ht

ROAD MARKING

Manufacturer: Contractor's choice.

Product reference: Thermoplastic.

Colour: 'White' to demark parking bays

Surface to receive markings: Clean and dry, loose material removed.

Application: Uniform, with no streaks or ragged edges.

COATED MACADAM PAVINGto paths and foot traffic area around proposed

buildings


Granular sub-base: Compacted thickness: 150 mm.





COATED MACADAM PAVING To CAR PARK areas - new tarmacadam build up


Granular sub-base: Type 1 Compacted thickness: 225 mm.


Compacted thickness: 70mm.



New Road Gully

new

b

ulln

osed

kerb

flu

sh

w

ith

tarm

ac

new

fu

ll kerb

h

eig

ht

new

fu

ll kerb

h

eig

ht

new

fu

ll kerb

h

eig

ht

new

fu

ll kerb

h

eig

ht

new

fu

ll kerb

h

eig

ht

new full kerb height new full kerb height


LH

d

ro

pp

er kerb

RH

d

ro

pp

er kerb

new 50 x 150mm edging kerb

Inv 85.22

A

A

B

+ 85.580

Inv 85.26

CL 85.71

SW IC 1

+ 85.680

+ 85.685

ACO drain

ACO drain

CL 85.730

SW IC 2

Inv 85.155

CL 85.68

SW IC 3

Inv 85.02

CL 85.45

SW IC 4

+ 85.67

+

+ 85.685

REUSED EXISTING BOW TOP METAL GATES:

1.4m high bow top galv. steel and powder coated double

vehicle entrance gates on 150 x 150mm steel posts

incorporating strike slam plate, slide bolt and padlock hole

and drop bolt to both gates. plus frame size 60mm x 60mm

gate posts 150 x 150mm set in mass concrete foundation

size 450 x 450 x 700mm.

AREA

NEW GRASSED

NE

W A

CO

S

UR

FA

CE

W

AT

ER

D

RA

IN

AG

E C

HA

NN

EL


EXISTING 1400MM BOW TOP METAL FENCING INCLUDING

ALL FENCE POSTS.



ALL FENCE POSTS.



ALL FENCE POSTS.

CA

RE

FU

LL

Y T

AK

E D

OW

N A

ND

S

ET

A

SID

E F

OR

R

EU

SE

T

HE

EX

IS

TIN

G 1400M

M B

OW

T

OP

M

ET

AL

F

EN

CIN

G IN

CL

UD

IN

G

AL

L F

EN

CE

P

OS

TS

.

REUSE EXISTING BOW TOP FENCING AND POSTS TO

SEGREGATE BETWEEN CAR PARK AND PLAYGROUND




















REUSE EXISTING BOW TOP

PEDESTRIAN GATE

OIL INTERCEPTOR

SEE DETAIL

OIL INTERCEPTOR

SEE DETAIL

12000MM LINEAR LENGHT OF 450MM HIGH TIMBER KNEE

HIGH BARRIER

USING 100 X 100 POSTS IN 300 X 300 X 300MM MASS

CONCRETE FOUNDATIONS. RAIL TO BE 100 X 100MM

AT 45 DEGREES. STRAP AND NAIL RAIL OVER POSTS WITH

1MM GALV PLATES. POST CENTRES 2300MM

12000MM LINEAR LENGHT OF 450MM HIGH TIMBER KNEE

HIGH BARRIER

USING 100 X 100 POSTS IN 300 X 300 X 300MM MASS

CONCRETE FOUNDATIONS. RAIL TO BE 100 X 100MM

AT 45 DEGREES. STRAP AND NAIL RAIL OVER POSTS WITH

1MM GALV PLATES. POST CENTRES 2300MM

GR

UB

O

UT

A

ND

R

EM

OV

E A

LL

E

XIS

TIN

G E

DG

IN

G K

ER

BS

FU

LL

H

EIG

HT

K

ER

BS

, D

RO

PP

ED

K

ER

BS

A

ND

S

UR

RO

UN

D

CO

NC

RE

TE

H

AU

NC

HIN

G

SA

W C

UT

S

TR

AIG

HT

L

IN

E T

O O

LD

T

AR

MA

CA

DA

M A

ND

FO

RM

B

UT

T JO

IN

T B

ET

WE

EN

O

LD

T

O N

EW

A

ND

L

IQ

UID

BIT

UM

IN

S

EA

L

GR

UB

O

UT

A

ND

R

EM

OV

E A

LL

E

XIS

TIN

G E

DG

IN

G K

ER

BS

FU

LL

H

EIG

HT

K

ER

BS

, D

RO

PP

ED

K

ER

BS

A

ND

S

UR

RO

UN

D

CO

NC

RE

TE

H

AU

NC

HIN

G

SA

W C

UT

S

TR

AIG

HT

L

IN

E T

O O

LD

T

AR

MA

CA

DA

M A

ND

FO

RM

B

UT

T JO

IN

T B

ET

WE

EN

O

LD

T

O N

EW

A

ND

L

IQ

UID

BIT

UM

IN

S

EA

L

GRUB OUT AND REMOVE GRAVEL, PLASTIC

GRASS CRETE TYPE PARKING SURFACE AND REMOVE

FROM SITE

EXISTING GULLY

EXISTING GULLY

AR

EA

NE

W G

RA

SS

ED

AR

EA

NE

W G

RA

SS

ED

Extended Staff Car Park

Existing Staff Car Park

Extended Staff Car Park

Existing playground area

County Council

PHASE 3 -TENDER

Phase 3 - External works - Car Park expansion plan

scale 1:50

Legend

New tarmacadam car park expansion

New pedestrian path /

playground tarmacadam

New grassed area -

Grass seed with min 250mm topsoil

SW MH

cl 85.51

il 84.85

Classroom

+

FFL 86.250

Studio Hall

D3

W1

W2

81m2

+ 85.650

+

85.570

+

85.610

+ 85.175

+ 85.413

+ 85.531

+ 85.295

+ 85.500

+ 85.320

+ 85.400

+ 85.248

+ 85.284

+ 85.212

+ 85.640

+

85.480

+ 85.570

C

C

A

Inv 85.02

CL 85.45

SW IC 4

+

+ 85.685

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

new

50 x 150m

m ed

gin

g kerb

new

50 x 150m

m ed

gin

g kerb

new

50 x 150m

m ed

gin

g kerb

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

N

E

W

A

C

O

S

U

R

F

A

C

E

W

A

T

E

R

D

R

A

IN

A

G

E

C

H

A

N

N

E

L

N

E

W

A

C

O

S

U

R

F

A

C

E

W

A

T

E

R

D

R

A

IN

A

G

E

C

H

A

N

N

E

L

N

E

W

A

C

O

S

U

R

F

A

C

E

W

A

T

E

R

D

R

A

IN

A

G

E

C

H

A

N

N

E

L

N

E

W

A

C

O

S

U

R

F

A

C

E

W

A

T

E

R

D

R

A

IN

A

G

E

C

H

A

N

N

E

L

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

Existing playground area

Proposed new tarmacadam playground

pipe Inv 84.55

CL 85.20

SW Orifice chamber

chamber base 83.97

Inv 84.6

CL 85.40 TBC

SW silt trap 1

trap base 84.10

Permavoid 150 storage tank below playgroun level

Aquacell Prime size 10266 x 4248mm x 300mm

with welded impermeable membrane surround

volume 13.38m3

tank base level 84.60

tank top level.84.90

SW

S 1

50mm

dia

pip

e

S

W

S

1

5

0

m

m

d

ia

p

ip

e

air vent to Permavoid

1200mm dia. concrete ring Orifice chamber on 225mm

mass concrete base, 150mm channel,

see detail of typical

silt trap

County Council

PHASE 3 -TENDER

Phase 3 - External works - New Playground Plan

scale 1:50

Legend

New pedestrian path /

playground tarmacadam

New grassed area -

Grass seed with min 250mm topsoil

Toilets

Toilets

Parents

Kitchen

Store

Store

EXISTING FW MH

CL 86.74

IL 86.05

Room

D1

FFL

+ 86.85

FFL

+ 86.85

Head Teacher's

Office

Entrance Lobby

D2

D3

D4

D5

RL 1

RL 3

W1

W2

Admin.

Office

Reception

+

+

86.627

86.61

+

86.83

+

+

86.85

86.84

+

86.83

+

86.83

+

86.627

+

remove post

RL 2

+

FW IC 1

CL 86.70

IL 85.90

SW IC 1

CL 86.74

IL 86.08

SW IC 2

CL 86.70

IL 85.97

n

e

w

1

0

0

m

m

F

W

S

n

e

w

1

5

0

m

m

F

W

S

n

e

w

1

0

0

m

m

F

W

S

n

e

w

1

0

0

m

m

F

W

S

n

e

w

1

0

0

m

m

S

W

S

n

e

w

1

0

0

m

m

S

W

S

n

e

w

1

0

0

m

m

S

W

S

n

e

w

1

0

0

m

m

S

W

S

n

e

w

1

0

0

m

m

S

W

S

n

e

w

1

0

0

m

m

S

W

S

n

e

w

1

0

0

m

m

S

W

S

+

86.83

+

+

86.520

86.675

ACO

ACO ACO

ACO ACOACO

ACO ACO

AC

OA

CO

AC

OA

CO

AC

OA

CO

AC

O

handrail

handrail

handrail

handrail

handrail

new

50 x 150m

m B

N edging

new 50 x 150mm BN edging

new

50 x 150m

m B

N edging

n

e

w

1

0

0

m

m

S

W

S

100mm rwp

100mm rwp

Soil Planter Margin

Soil Planter Margin

Slabbed area

County Council

PHASE 4 -TENDER

Phase 4 - Proposed part floor plan

Scale 1:20

Surround new 100mm

downpipe with 50 x 50mm

s/w timber duct framework

line over with 12.5mm

plasterboard and skim

Surround new 100mm

downpipe with 50 x 50mm

s/w timber duct framework

line over with 12.5mm

plasterboard and skim

Carefully remove all

internal partitioning shown

dashed.

Carefully remove internal

cupboards shown dashed

Carefully remove external

windows and support frame

as shown dashed



as shown dashed



as shown dashed

form new foul connection

into new FW system

Metsec metal stud

framework offset from

existing external wall

Dry line out existing internal

walls with 50 x 50mm s/w

vertical battens and line

over with 12.5mm

platerboard + skim

Metsec metal stud

framework offset from

existing internal wall


walls with 50 x 50mm s/w

vertical battens and line

over with 12.5mm

platerboard + skim


walls with Metsec 100 C

section studs at 600mm c/c

and line over with 12.5mm

Knauf Fire Panel

platerboard + skim

connect existing wc to new

toilet waste and to

discharge into new Stub

stacks,



dashed and internal posts.

Support existing roof

cassette with gluam beam

to SE details



dashed and internal posts.

Support existing roof

cassette with gluam beam

to SE details

Receptionist worktop

Retain existing rooflight

and clean prior to handover

reline the rooflight side

cheeks with 18mm MDF

board and gloss paint out in

white

Retain existing door and

side screen

Retain existing double

doorset -Protect doorset

during construction process

Remove and grub out

foul manhole and drains

these will be live drains

Remove and grub out

drains .these will be live

drains

Remove and grub out

foul water drains . note


Remove and grub out

storm water drains . note


Remove and grub out



Remove and grub out



Remove and grub out



Remove and grub out

storm water manhole and

drains . note these will be

live drains

From 150mm flexible

coupling and encase in

concrete CCTV drain run

prior to covering over

From 100mm flexible

coupling and encase in

concrete CCTV drain run

prior to covering over

New timber structural

support post to new Glulam

beam See SE details



beam See SE details





Knauf Fire Panel

platerboard + skim



beam See SE details



beam See SE details





Knauf Fire Panel

platerboard + skim



beam See SE details

Drainage Strategy


Appendix J

Windes Calculations

J1 Southwest Discharge Point Surface Water Marked up Plan indicating Manhole labels

J2: Southwest Discharge Point Surface Water Simulation

J3: Southwest Discharge Point Surface Water Simulation – Failure

J4: Northwest Discharge Point Surface Water Water Marked up Plan indicating Manhole labels

J5: Northwest Discharge Point Surface Water Simulation

J6: Northwest Discharge Point Surface Water Simulation – Failure

Appendix K

Overland Flooding Route For The Surface Water

Pick Everard Page 1

Halford House Long Lawford Priamry School

Charles Street South Dischaege Point

Leicester LE1 1HA

Date 01 Designed by KJD

File S001KJD - 171541 - SOUTH... Checked by ART

XP Solutions Network 2016.1

Existing Network Details for Storm

©1982-2016 XP Solutions

# - Indicates pipe length does not match coordinates

PN Length

(m)

Fall

(m)

Slope

(1:X)

I.Area

(ha)

T.E.

(mins)

Base

Flow (l/s)

k

(mm)

HYD

SECT

DIA

(mm)

Section Type

1.000 10.225 0.133 76.9 0.010 4.00 0.0 0.006 o 100 Pipe/Conduit

2.000 6.000 0.133 45.1 0.010 4.00 0.0 0.006 o 100 Pipe/Conduit

1.001 19.700# 0.177 111.3 0.000 4.00 0.0 0.006 o 150 Pipe/Conduit

3.000 11.000 0.200 55.0 0.010 4.00 0.0 0.006 o 100 Pipe/Conduit

3.001 7.200# 0.110 65.5 0.000 0.00 0.0 0.006 o 100 Pipe/Conduit

1.002 1.100 0.030 36.7 0.000 0.00 0.0 0.006 o 150 Pipe/Conduit

1.003 3.000 0.050 60.0 0.010 4.00 0.0 0.006 o 150 Pipe/Conduit

1.004 4.000 0.210 19.0 0.000 4.00 0.0 0.006 o 150 Pipe/Conduit

1.005 7.200 0.000 0.0 0.000 4.00 0.2 0.006 o 150 Pipe/Conduit

Network Results Table

PN US/IL

(m)

Σ I.Area

(ha)

Σ Base

Flow (l/s)

Vel

(m/s)

Cap

(l/s)

1.000 85.200 0.010 0.0 1.20 9.4

2.000 85.200 0.010 0.0 1.61 12.7

1.001 85.067 0.020 0.0 1.28 22.7

3.000 85.200 0.010 0.0 1.45 11.4

3.001 85.000 0.010 0.0 1.31 10.3

1.002 84.890 0.030 0.0 2.35 41.6

1.003 84.860 0.040 0.0 1.80 31.8

1.004 84.810 0.040 0.0 3.36 59.4

1.005 84.600 0.040 0.2 0.00 0.0

Pick Everard Page 2



Leicester LE1 1HA




Area Summary for Storm


Pipe

Number

PIMP

Type

PIMP

Name

PIMP

(%)

Gross

Area (ha)

Imp.

Area (ha)

Pipe Total

(ha)

1.000 - - 100 0.010 0.010 0.010

2.000 - - 100 0.010 0.010 0.010

1.001 - - 100 0.000 0.000 0.000

3.000 - - 100 0.010 0.010 0.010

3.001 - - 100 0.000 0.000 0.000

1.002 - - 100 0.000 0.000 0.000

1.003 - - 100 0.010 0.010 0.010

1.004 - - 100 0.000 0.000 0.000

1.005 - - 100 0.000 0.000 0.000

Total Total Total

0.040 0.040 0.040

Free Flowing Outfall Details for Storm

Outfall

Pipe Number

Outfall

Name

C. Level

(m)

I. Level

(m)

Min

I. Level

(m)

D,L

(mm)

W

(mm)

1.005 Culverted WC 85.500 84.600 84.600 1200 0

Simulation Criteria for Storm

Volumetric Runoff Coeff 0.750 Additional Flow - % of Total Flow 0.000

Areal Reduction Factor 1.000 MADD Factor * 10m³/ha Storage 0.000

Hot Start (mins) 0 Inlet Coeffiecient 0.800

Hot Start Level (mm) 0 Flow per Person per Day (l/per/day) 0.000

Manhole Headloss Coeff (Global) 0.500 Run Time (mins) 60

Foul Sewage per hectare (l/s) 0.000 Output Interval (mins) 1

Number of Input Hydrographs 0 Number of Offline Controls 0 Number of Time/Area Diagrams 0

Number of Online Controls 1 Number of Storage Structures 1 Number of Real Time Controls 0

Synthetic Rainfall Details

Rainfall Model FSR Profile Type Summer

Return Period (years) 100 Cv (Summer) 0.750

Region England and Wales Cv (Winter) 0.840

M5-60 (mm) 19.200 Storm Duration (mins) 30

Ratio R 0.417

Pick Everard Page 3



Leicester LE1 1HA




Online Controls for Storm


Level Controlled Pump Manhole: Tank, DS/PN: 1.004, Volume (m³): 0.2

Invert Level (m) 84.810 Cut In Height (m) 0.790 Cut Out Height (m) 0.100

Depth (m) Outflow (l/s)

1.215 1.1500

Pick Everard Page 4



Leicester LE1 1HA




Storage Structures for Storm


Tank or Pond Manhole: Tank, DS/PN: 1.004

Invert Level (m) 84.810

Depth (m) Area (m²) Depth (m) Area (m²)

0.000 18.7 0.800 18.7

Pick Everard Page 5



Leicester LE1 1HA




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


Simulation Criteria

Areal Reduction Factor 1.000 Additional Flow - % of Total Flow 0.000

Hot Start (mins) 0 MADD Factor * 10m³/ha Storage 0.000

Hot Start Level (mm) 0 Inlet Coeffiecient 0.800

Manhole Headloss Coeff (Global) 0.500 Flow per Person per Day (l/per/day) 0.000

Foul Sewage per hectare (l/s) 0.000




Rainfall Model FSR Ratio R 0.417

Region England and Wales Cv (Summer) 0.750

M5-60 (mm) 19.200 Cv (Winter) 0.840

Margin for Flood Risk Warning (mm) 200.0

Analysis Timestep 2.5 Second Increment (Extended)

DTS Status ON

DVD Status ON

Inertia Status ON

Profile(s) Summer and Winter

Duration(s) (mins) 15, 30, 60, 120, 180, 240, 360, 480, 600, 720,

960, 1440

Return Period(s) (years) 1, 2, 30, 100

Climate Change (%) 0, 0, 0, 40

PN

US/MH

Name Storm

Return

Period

Climate

Change

First (X)

Surcharge

First (Y)

Flood

First (Z)

Overflow

Overflow

Act.

1.000 SWIC2 480 Winter 100 +40% 2/1440 Winter

2.000 SWIC3g 480 Winter 100 +40% 2/1440 Winter

1.001 SWIC3 480 Winter 100 +40% 1/1440 Winter 100/120 Winter

3.000 SWIC4g 180 Winter 100 +40% 2/1440 Winter



1.003 Silt Trap 180 Winter 100 +40% 1/120 Summer

1.004 Tank 180 Winter 100 +40% 1/30 Winter 100/60 Winter

1.005 SWMH3 240 Winter 100 +40%

Pick Everard Page 6



Leicester LE1 1HA






PN

US/MH

Name

Water

Level

(m)

Surcharged

Depth

(m)

Flooded

Volume

(m³)

Flow /

Cap.

Overflow

(l/s)

Pipe

Flow

(l/s) Status

Level

Exceeded

1.000 SWIC2 85.605 0.305 0.000 0.07 0.6 FLOOD RISK

2.000 SWIC3g 85.605 0.305 0.000 0.06 0.6 FLOOD RISK

1.001 SWIC3 85.603 0.386 3.326 0.06 1.2 FLOOD 13

3.000 SWIC4g 85.618 0.318 0.000 0.14 1.4 FLOOD RISK

3.001 SWIC4 85.612 0.512 0.000 0.15 1.3 FLOOD RISK

1.002 SWIC05 85.606 0.566 0.000 0.34 3.7 FLOOD RISK

1.003 Silt Trap 85.607 0.597 0.000 0.34 4.8 FLOOD RISK

1.004 Tank 85.606 0.646 0.105 0.03 0.8 FLOOD 13

1.005 SWMH3 84.635 -0.115 0.000 0.11 1.0 OK

Pick Everard Page 7



Leicester LE1 1HA




Rainfall Hyetograph for 480 minute 100 year Winter I+40%

for Pipe 1.000 (Storm)


Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 0.362 45 4.830 89 5.065 133 8.295 177 16.326 221 25.695

2 0.362 46 4.830 90 5.065 134 8.295 178 16.759 222 26.301

3 0.362 47 4.830 91 5.065 135 8.700 179 17.410 223 26.301

4 0.362 48 4.830 92 5.170 136 8.969 180 17.410 224 26.301

5 0.573 49 4.886 93 5.196 137 8.969 181 17.410 225 26.301

6 1.414 50 4.886 94 5.196 138 8.969 182 17.410 226 26.561

7 1.414 51 4.886 95 5.196 139 8.969 183 18.067 227 26.951

8 1.414 52 4.886 96 5.196 140 9.559 184 18.505 228 26.951

9 1.414 53 4.891 97 5.376 141 9.707 185 18.505 229 26.951

10 1.762 54 4.909 98 5.376 142 9.707 186 18.505 230 26.951

11 2.284 55 4.909 99 5.376 143 9.707 187 18.505 231 27.266

12 2.284 56 4.909 100 5.376 144 9.707 188 19.382 232 27.475

13 2.284 57 4.909 101 5.422 145 10.505 189 19.601 233 27.475

14 2.284 58 4.909 102 5.608 146 10.505 190 19.601 234 27.475

15 2.708 59 4.910 103 5.608 147 10.505 191 19.601 235 27.475

16 2.991 60 4.910 104 5.608 148 10.505 192 19.601 236 27.780

17 2.991 61 4.910 105 5.608 149 10.676 193 20.688 237 27.856

18 2.991 62 4.910 106 5.724 150 11.361 194 20.688 238 27.856

19 2.991 63 4.905 107 5.898 151 11.361 195 20.688 239 27.856

20 3.442 64 4.902 108 5.898 152 11.361 196 20.688 240 27.856

21 3.555 65 4.902 109 5.898 153 11.361 197 20.901 241 27.856

22 3.555 66 4.902 110 5.898 154 11.724 198 21.753 242 27.856

23 3.555 67 4.902 111 6.109 155 12.270 199 21.753 243 27.856

24 3.555 68 4.897 112 6.249 156 12.270 200 21.753 244 27.856

25 3.993 69 4.895 113 6.249 157 12.270 201 21.753 245 27.780

26 3.993 70 4.895 114 6.249 158 12.270 202 22.166 246 27.475

27 3.993 71 4.895 115 6.249 159 12.844 203 22.785 247 27.475

28 3.993 72 4.895 116 6.580 160 13.227 204 22.785 248 27.475

29 4.059 73 4.899 117 6.663 161 13.227 205 22.785 249 27.475

30 4.324 74 4.899 118 6.663 162 13.227 206 22.785 250 27.266

31 4.324 75 4.899 119 6.663 163 13.227 207 23.376 251 26.951

32 4.324 76 4.899 120 6.663 164 14.026 208 23.770 252 26.951

33 4.324 77 4.904 121 7.141 165 14.226 209 23.770 253 26.951

34 4.420 78 4.924 122 7.141 166 14.226 210 23.770 254 26.951

35 4.563 79 4.924 123 7.141 167 14.226 211 23.770 255 26.561

36 4.563 80 4.924 124 7.141 168 14.226 212 24.510 256 26.301

37 4.563 81 4.924 125 7.250 169 15.262 213 24.695 257 26.301

38 4.563 82 4.945 126 7.685 170 15.262 214 24.695 258 26.301

39 4.661 83 4.977 127 7.685 171 15.262 215 24.695 259 26.301

40 4.727 84 4.977 128 7.685 172 15.262 216 24.695 260 25.695

41 4.727 85 4.977 129 7.685 173 15.474 217 25.544 261 25.544

42 4.727 86 4.977 130 7.929 174 16.326 218 25.544 262 25.544

43 4.727 87 5.030 131 8.295 175 16.326 219 25.544 263 25.544

44 4.809 88 5.065 132 8.295 176 16.326 220 25.544 264 25.544

Pick Everard Page 8



Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

265 24.695 301 17.410 337 9.707 373 5.898 409 4.895 445 4.563

266 24.695 302 17.410 338 9.707 374 5.898 410 4.895 446 4.563

267 24.695 303 16.759 339 9.707 375 5.724 411 4.895 447 4.420

268 24.695 304 16.326 340 9.707 376 5.608 412 4.895 448 4.324

269 24.510 305 16.326 341 9.559 377 5.608 413 4.897 449 4.324

270 23.770 306 16.326 342 8.969 378 5.608 414 4.902 450 4.324

271 23.770 307 16.326 343 8.969 379 5.608 415 4.902 451 4.324

272 23.770 308 15.474 344 8.969 380 5.422 416 4.902 452 4.059

273 23.770 309 15.262 345 8.969 381 5.376 417 4.902 453 3.993

274 23.376 310 15.262 346 8.700 382 5.376 418 4.905 454 3.993

275 22.785 311 15.262 347 8.295 383 5.376 419 4.910 455 3.993

276 22.785 312 15.262 348 8.295 384 5.376 420 4.910 456 3.993

277 22.785 313 14.226 349 8.295 385 5.196 421 4.910 457 3.555

278 22.785 314 14.226 350 8.295 386 5.196 422 4.910 458 3.555

279 22.166 315 14.226 351 7.929 387 5.196 423 4.909 459 3.555

280 21.753 316 14.226 352 7.685 388 5.196 424 4.909 460 3.555

281 21.753 317 14.026 353 7.685 389 5.170 425 4.909 461 3.442

282 21.753 318 13.227 354 7.685 390 5.065 426 4.909 462 2.991

283 21.753 319 13.227 355 7.685 391 5.065 427 4.909 463 2.991

284 20.901 320 13.227 356 7.250 392 5.065 428 4.891 464 2.991

285 20.688 321 13.227 357 7.141 393 5.065 429 4.886 465 2.991

286 20.688 322 12.844 358 7.141 394 5.030 430 4.886 466 2.708

287 20.688 323 12.270 359 7.141 395 4.977 431 4.886 467 2.284

288 20.688 324 12.270 360 7.141 396 4.977 432 4.886 468 2.284

289 19.601 325 12.270 361 6.663 397 4.977 433 4.830 469 2.284

290 19.601 326 12.270 362 6.663 398 4.977 434 4.830 470 2.284

291 19.601 327 11.724 363 6.663 399 4.945 435 4.830 471 1.762

292 19.601 328 11.361 364 6.663 400 4.924 436 4.830 472 1.414

293 19.382 329 11.361 365 6.580 401 4.924 437 4.809 473 1.414

294 18.505 330 11.361 366 6.249 402 4.924 438 4.727 474 1.414

295 18.505 331 11.361 367 6.249 403 4.924 439 4.727 475 1.414

296 18.505 332 10.676 368 6.249 404 4.904 440 4.727 476 0.573

297 18.505 333 10.505 369 6.249 405 4.899 441 4.727 477 0.362

298 18.067 334 10.505 370 6.109 406 4.899 442 4.661 478 0.362

299 17.410 335 10.505 371 5.898 407 4.899 443 4.563 479 0.362

300 17.410 336 10.505 372 5.898 408 4.899 444 4.563 480 0.362

Pick Everard Page 9



Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 0.362 45 4.830 89 5.065 133 8.295 177 16.326 221 25.695

2 0.362 46 4.830 90 5.065 134 8.295 178 16.759 222 26.301

3 0.362 47 4.830 91 5.065 135 8.700 179 17.410 223 26.301

4 0.362 48 4.830 92 5.170 136 8.969 180 17.410 224 26.301

5 0.573 49 4.886 93 5.196 137 8.969 181 17.410 225 26.301

6 1.414 50 4.886 94 5.196 138 8.969 182 17.410 226 26.561

7 1.414 51 4.886 95 5.196 139 8.969 183 18.067 227 26.951

8 1.414 52 4.886 96 5.196 140 9.559 184 18.505 228 26.951

9 1.414 53 4.891 97 5.376 141 9.707 185 18.505 229 26.951

10 1.762 54 4.909 98 5.376 142 9.707 186 18.505 230 26.951

11 2.284 55 4.909 99 5.376 143 9.707 187 18.505 231 27.266

12 2.284 56 4.909 100 5.376 144 9.707 188 19.382 232 27.475

13 2.284 57 4.909 101 5.422 145 10.505 189 19.601 233 27.475

14 2.284 58 4.909 102 5.608 146 10.505 190 19.601 234 27.475

15 2.708 59 4.910 103 5.608 147 10.505 191 19.601 235 27.475

16 2.991 60 4.910 104 5.608 148 10.505 192 19.601 236 27.780

17 2.991 61 4.910 105 5.608 149 10.676 193 20.688 237 27.856

18 2.991 62 4.910 106 5.724 150 11.361 194 20.688 238 27.856

19 2.991 63 4.905 107 5.898 151 11.361 195 20.688 239 27.856

20 3.442 64 4.902 108 5.898 152 11.361 196 20.688 240 27.856

21 3.555 65 4.902 109 5.898 153 11.361 197 20.901 241 27.856

22 3.555 66 4.902 110 5.898 154 11.724 198 21.753 242 27.856

23 3.555 67 4.902 111 6.109 155 12.270 199 21.753 243 27.856

24 3.555 68 4.897 112 6.249 156 12.270 200 21.753 244 27.856

25 3.993 69 4.895 113 6.249 157 12.270 201 21.753 245 27.780

26 3.993 70 4.895 114 6.249 158 12.270 202 22.166 246 27.475

27 3.993 71 4.895 115 6.249 159 12.844 203 22.785 247 27.475

28 3.993 72 4.895 116 6.580 160 13.227 204 22.785 248 27.475

29 4.059 73 4.899 117 6.663 161 13.227 205 22.785 249 27.475

30 4.324 74 4.899 118 6.663 162 13.227 206 22.785 250 27.266

31 4.324 75 4.899 119 6.663 163 13.227 207 23.376 251 26.951

32 4.324 76 4.899 120 6.663 164 14.026 208 23.770 252 26.951

33 4.324 77 4.904 121 7.141 165 14.226 209 23.770 253 26.951

34 4.420 78 4.924 122 7.141 166 14.226 210 23.770 254 26.951

35 4.563 79 4.924 123 7.141 167 14.226 211 23.770 255 26.561

36 4.563 80 4.924 124 7.141 168 14.226 212 24.510 256 26.301

37 4.563 81 4.924 125 7.250 169 15.262 213 24.695 257 26.301

38 4.563 82 4.945 126 7.685 170 15.262 214 24.695 258 26.301

39 4.661 83 4.977 127 7.685 171 15.262 215 24.695 259 26.301

40 4.727 84 4.977 128 7.685 172 15.262 216 24.695 260 25.695

41 4.727 85 4.977 129 7.685 173 15.474 217 25.544 261 25.544

42 4.727 86 4.977 130 7.929 174 16.326 218 25.544 262 25.544

43 4.727 87 5.030 131 8.295 175 16.326 219 25.544 263 25.544

44 4.809 88 5.065 132 8.295 176 16.326 220 25.544 264 25.544

Pick Everard Page 10



Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

265 24.695 301 17.410 337 9.707 373 5.898 409 4.895 445 4.563

266 24.695 302 17.410 338 9.707 374 5.898 410 4.895 446 4.563

267 24.695 303 16.759 339 9.707 375 5.724 411 4.895 447 4.420

268 24.695 304 16.326 340 9.707 376 5.608 412 4.895 448 4.324

269 24.510 305 16.326 341 9.559 377 5.608 413 4.897 449 4.324

270 23.770 306 16.326 342 8.969 378 5.608 414 4.902 450 4.324

271 23.770 307 16.326 343 8.969 379 5.608 415 4.902 451 4.324

272 23.770 308 15.474 344 8.969 380 5.422 416 4.902 452 4.059

273 23.770 309 15.262 345 8.969 381 5.376 417 4.902 453 3.993

274 23.376 310 15.262 346 8.700 382 5.376 418 4.905 454 3.993

275 22.785 311 15.262 347 8.295 383 5.376 419 4.910 455 3.993

276 22.785 312 15.262 348 8.295 384 5.376 420 4.910 456 3.993

277 22.785 313 14.226 349 8.295 385 5.196 421 4.910 457 3.555

278 22.785 314 14.226 350 8.295 386 5.196 422 4.910 458 3.555

279 22.166 315 14.226 351 7.929 387 5.196 423 4.909 459 3.555

280 21.753 316 14.226 352 7.685 388 5.196 424 4.909 460 3.555

281 21.753 317 14.026 353 7.685 389 5.170 425 4.909 461 3.442

282 21.753 318 13.227 354 7.685 390 5.065 426 4.909 462 2.991

283 21.753 319 13.227 355 7.685 391 5.065 427 4.909 463 2.991

284 20.901 320 13.227 356 7.250 392 5.065 428 4.891 464 2.991

285 20.688 321 13.227 357 7.141 393 5.065 429 4.886 465 2.991

286 20.688 322 12.844 358 7.141 394 5.030 430 4.886 466 2.708

287 20.688 323 12.270 359 7.141 395 4.977 431 4.886 467 2.284

288 20.688 324 12.270 360 7.141 396 4.977 432 4.886 468 2.284

289 19.601 325 12.270 361 6.663 397 4.977 433 4.830 469 2.284

290 19.601 326 12.270 362 6.663 398 4.977 434 4.830 470 2.284

291 19.601 327 11.724 363 6.663 399 4.945 435 4.830 471 1.762

292 19.601 328 11.361 364 6.663 400 4.924 436 4.830 472 1.414

293 19.382 329 11.361 365 6.580 401 4.924 437 4.809 473 1.414

294 18.505 330 11.361 366 6.249 402 4.924 438 4.727 474 1.414

295 18.505 331 11.361 367 6.249 403 4.924 439 4.727 475 1.414

296 18.505 332 10.676 368 6.249 404 4.904 440 4.727 476 0.573

297 18.505 333 10.505 369 6.249 405 4.899 441 4.727 477 0.362

298 18.067 334 10.505 370 6.109 406 4.899 442 4.661 478 0.362

299 17.410 335 10.505 371 5.898 407 4.899 443 4.563 479 0.362

300 17.410 336 10.505 372 5.898 408 4.899 444 4.563 480 0.362




Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 0.362 45 4.830 89 5.065 133 8.295 177 16.326 221 25.695

2 0.362 46 4.830 90 5.065 134 8.295 178 16.759 222 26.301

3 0.362 47 4.830 91 5.065 135 8.700 179 17.410 223 26.301

4 0.362 48 4.830 92 5.170 136 8.969 180 17.410 224 26.301

5 0.573 49 4.886 93 5.196 137 8.969 181 17.410 225 26.301

6 1.414 50 4.886 94 5.196 138 8.969 182 17.410 226 26.561

7 1.414 51 4.886 95 5.196 139 8.969 183 18.067 227 26.951

8 1.414 52 4.886 96 5.196 140 9.559 184 18.505 228 26.951

9 1.414 53 4.891 97 5.376 141 9.707 185 18.505 229 26.951

10 1.762 54 4.909 98 5.376 142 9.707 186 18.505 230 26.951

11 2.284 55 4.909 99 5.376 143 9.707 187 18.505 231 27.266

12 2.284 56 4.909 100 5.376 144 9.707 188 19.382 232 27.475

13 2.284 57 4.909 101 5.422 145 10.505 189 19.601 233 27.475

14 2.284 58 4.909 102 5.608 146 10.505 190 19.601 234 27.475

15 2.708 59 4.910 103 5.608 147 10.505 191 19.601 235 27.475

16 2.991 60 4.910 104 5.608 148 10.505 192 19.601 236 27.780

17 2.991 61 4.910 105 5.608 149 10.676 193 20.688 237 27.856

18 2.991 62 4.910 106 5.724 150 11.361 194 20.688 238 27.856

19 2.991 63 4.905 107 5.898 151 11.361 195 20.688 239 27.856

20 3.442 64 4.902 108 5.898 152 11.361 196 20.688 240 27.856

21 3.555 65 4.902 109 5.898 153 11.361 197 20.901 241 27.856

22 3.555 66 4.902 110 5.898 154 11.724 198 21.753 242 27.856

23 3.555 67 4.902 111 6.109 155 12.270 199 21.753 243 27.856

24 3.555 68 4.897 112 6.249 156 12.270 200 21.753 244 27.856

25 3.993 69 4.895 113 6.249 157 12.270 201 21.753 245 27.780

26 3.993 70 4.895 114 6.249 158 12.270 202 22.166 246 27.475

27 3.993 71 4.895 115 6.249 159 12.844 203 22.785 247 27.475

28 3.993 72 4.895 116 6.580 160 13.227 204 22.785 248 27.475

29 4.059 73 4.899 117 6.663 161 13.227 205 22.785 249 27.475

30 4.324 74 4.899 118 6.663 162 13.227 206 22.785 250 27.266

31 4.324 75 4.899 119 6.663 163 13.227 207 23.376 251 26.951

32 4.324 76 4.899 120 6.663 164 14.026 208 23.770 252 26.951

33 4.324 77 4.904 121 7.141 165 14.226 209 23.770 253 26.951

34 4.420 78 4.924 122 7.141 166 14.226 210 23.770 254 26.951

35 4.563 79 4.924 123 7.141 167 14.226 211 23.770 255 26.561

36 4.563 80 4.924 124 7.141 168 14.226 212 24.510 256 26.301

37 4.563 81 4.924 125 7.250 169 15.262 213 24.695 257 26.301

38 4.563 82 4.945 126 7.685 170 15.262 214 24.695 258 26.301

39 4.661 83 4.977 127 7.685 171 15.262 215 24.695 259 26.301

40 4.727 84 4.977 128 7.685 172 15.262 216 24.695 260 25.695

41 4.727 85 4.977 129 7.685 173 15.474 217 25.544 261 25.544

42 4.727 86 4.977 130 7.929 174 16.326 218 25.544 262 25.544

43 4.727 87 5.030 131 8.295 175 16.326 219 25.544 263 25.544

44 4.809 88 5.065 132 8.295 176 16.326 220 25.544 264 25.544




Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

265 24.695 301 17.410 337 9.707 373 5.898 409 4.895 445 4.563

266 24.695 302 17.410 338 9.707 374 5.898 410 4.895 446 4.563

267 24.695 303 16.759 339 9.707 375 5.724 411 4.895 447 4.420

268 24.695 304 16.326 340 9.707 376 5.608 412 4.895 448 4.324

269 24.510 305 16.326 341 9.559 377 5.608 413 4.897 449 4.324

270 23.770 306 16.326 342 8.969 378 5.608 414 4.902 450 4.324

271 23.770 307 16.326 343 8.969 379 5.608 415 4.902 451 4.324

272 23.770 308 15.474 344 8.969 380 5.422 416 4.902 452 4.059

273 23.770 309 15.262 345 8.969 381 5.376 417 4.902 453 3.993

274 23.376 310 15.262 346 8.700 382 5.376 418 4.905 454 3.993

275 22.785 311 15.262 347 8.295 383 5.376 419 4.910 455 3.993

276 22.785 312 15.262 348 8.295 384 5.376 420 4.910 456 3.993

277 22.785 313 14.226 349 8.295 385 5.196 421 4.910 457 3.555

278 22.785 314 14.226 350 8.295 386 5.196 422 4.910 458 3.555

279 22.166 315 14.226 351 7.929 387 5.196 423 4.909 459 3.555

280 21.753 316 14.226 352 7.685 388 5.196 424 4.909 460 3.555

281 21.753 317 14.026 353 7.685 389 5.170 425 4.909 461 3.442

282 21.753 318 13.227 354 7.685 390 5.065 426 4.909 462 2.991

283 21.753 319 13.227 355 7.685 391 5.065 427 4.909 463 2.991

284 20.901 320 13.227 356 7.250 392 5.065 428 4.891 464 2.991

285 20.688 321 13.227 357 7.141 393 5.065 429 4.886 465 2.991

286 20.688 322 12.844 358 7.141 394 5.030 430 4.886 466 2.708

287 20.688 323 12.270 359 7.141 395 4.977 431 4.886 467 2.284

288 20.688 324 12.270 360 7.141 396 4.977 432 4.886 468 2.284

289 19.601 325 12.270 361 6.663 397 4.977 433 4.830 469 2.284

290 19.601 326 12.270 362 6.663 398 4.977 434 4.830 470 2.284

291 19.601 327 11.724 363 6.663 399 4.945 435 4.830 471 1.762

292 19.601 328 11.361 364 6.663 400 4.924 436 4.830 472 1.414

293 19.382 329 11.361 365 6.580 401 4.924 437 4.809 473 1.414

294 18.505 330 11.361 366 6.249 402 4.924 438 4.727 474 1.414

295 18.505 331 11.361 367 6.249 403 4.924 439 4.727 475 1.414

296 18.505 332 10.676 368 6.249 404 4.904 440 4.727 476 0.573

297 18.505 333 10.505 369 6.249 405 4.899 441 4.727 477 0.362

298 18.067 334 10.505 370 6.109 406 4.899 442 4.661 478 0.362

299 17.410 335 10.505 371 5.898 407 4.899 443 4.563 479 0.362

300 17.410 336 10.505 372 5.898 408 4.899 444 4.563 480 0.362




Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 0.789 31 10.770 61 28.807 91 60.670 121 27.974 151 10.724

2 1.247 32 10.839 62 30.549 92 60.504 122 26.723 152 10.681

3 3.080 33 10.955 63 30.984 93 59.840 123 25.535 153 10.671

4 3.837 34 11.032 64 33.239 94 59.383 124 24.744 154 10.662

5 4.974 35 11.260 65 33.703 95 58.698 125 23.253 155 10.665

6 5.898 36 11.318 66 35.556 96 57.849 126 22.880 156 10.677

7 6.514 37 11.708 67 36.501 97 57.283 127 21.141 157 10.684

8 7.496 38 11.810 68 37.917 98 55.963 128 20.820 158 10.694

9 7.742 39 12.215 69 39.348 99 55.633 129 19.535 159 10.692

10 8.697 40 12.467 70 40.302 100 53.785 130 18.948 160 10.691

11 8.841 41 12.846 71 42.212 101 53.382 131 18.066 161 10.651

12 9.417 42 13.305 72 42.690 102 51.771 132 17.269 162 10.641

13 9.626 43 13.610 73 45.057 103 50.913 133 16.738 163 10.519

14 9.939 44 14.331 74 45.521 104 49.625 134 15.790 164 10.474

15 10.152 45 14.511 75 47.377 105 48.276 135 15.553 165 10.295

16 10.295 46 15.553 76 48.276 106 47.377 136 14.511 166 10.153

17 10.474 47 15.790 77 49.625 107 45.521 137 14.331 167 9.939

18 10.519 48 16.738 78 50.913 108 45.057 138 13.610 168 9.626

19 10.642 49 17.269 79 51.771 109 42.690 139 13.304 169 9.417

20 10.651 50 18.066 80 53.382 110 42.212 140 12.846 170 8.841

21 10.691 51 18.948 81 53.785 111 40.302 141 12.468 171 8.697

22 10.692 52 19.535 82 55.633 112 39.348 142 12.215 172 7.742

23 10.694 53 20.820 83 55.963 113 37.917 143 11.810 173 7.496

24 10.684 54 21.141 84 57.283 114 36.501 144 11.708 174 6.514

25 10.677 55 22.880 85 57.849 115 35.556 145 11.317 175 5.898

26 10.665 56 23.253 86 58.698 116 33.703 146 11.260 176 4.974

27 10.662 57 24.744 87 59.383 117 33.239 147 11.032 177 3.837

28 10.671 58 25.535 88 59.840 118 30.984 148 10.955 178 3.080

29 10.681 59 26.723 89 60.504 119 30.549 149 10.839 179 1.247

30 10.724 60 27.974 90 60.670 120 28.807 150 10.770 180 0.789




Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 0.630 41 8.581 81 23.002 121 48.445 161 22.670 201 8.563

2 0.630 42 8.655 82 23.698 122 48.445 162 21.338 202 8.546

3 1.728 43 8.655 83 24.741 123 48.047 163 21.338 203 8.521

4 2.459 44 8.778 84 24.741 124 47.782 164 20.074 204 8.521

5 2.762 45 8.809 85 26.541 125 47.599 165 19.758 205 8.513

6 3.971 46 8.900 86 26.541 126 46.870 166 19.162 206 8.513

7 3.971 47 9.037 87 27.651 127 46.870 167 18.270 207 8.520

8 4.955 48 9.037 88 28.391 128 45.966 168 18.270 208 8.525

9 5.201 49 9.349 89 28.768 129 45.740 169 16.881 209 8.528

10 5.593 50 9.349 90 30.277 130 45.213 170 16.881 210 8.539

11 6.182 51 9.592 91 30.277 131 44.423 171 16.112 211 8.539

12 6.182 52 9.753 92 31.800 132 44.423 172 15.599 212 8.537

13 6.944 53 9.854 93 32.181 133 42.947 173 15.364 213 8.537

14 6.944 54 10.258 94 32.944 134 42.947 174 14.426 214 8.521

15 7.290 55 10.258 95 34.088 135 41.982 175 14.426 215 8.497

16 7.520 56 10.745 96 34.088 136 41.339 176 13.577 216 8.497

17 7.603 57 10.867 97 35.977 137 40.996 177 13.365 217 8.399

18 7.936 58 11.155 98 35.977 138 39.625 178 12.987 218 8.399

19 7.936 59 11.587 99 37.089 139 39.625 179 12.419 219 8.292

20 8.164 60 11.587 100 37.830 140 38.189 180 12.419 220 8.221

21 8.221 61 12.419 101 38.189 141 37.830 181 11.587 221 8.164

22 8.292 62 12.419 102 39.625 142 37.089 182 11.587 222 7.936

23 8.399 63 12.987 103 39.625 143 35.977 183 11.155 223 7.936

24 8.399 64 13.365 104 40.996 144 35.977 184 10.867 224 7.603

25 8.497 65 13.577 105 41.339 145 34.087 185 10.745 225 7.520

26 8.497 66 14.426 106 41.982 146 34.087 186 10.258 226 7.290

27 8.521 67 14.426 107 42.947 147 32.944 187 10.258 227 6.944

28 8.537 68 15.364 108 42.947 148 32.181 188 9.854 228 6.944

29 8.537 69 15.599 109 44.423 149 31.800 189 9.753 229 6.182

30 8.539 70 16.112 110 44.423 150 30.277 190 9.592 230 6.182

31 8.539 71 16.881 111 45.213 151 30.277 191 9.349 231 5.594

32 8.528 72 16.881 112 45.740 152 28.768 192 9.349 232 5.201

33 8.525 73 18.270 113 45.966 153 28.391 193 9.037 233 4.955

34 8.520 74 18.270 114 46.870 154 27.651 194 9.037 234 3.972

35 8.513 75 19.162 115 46.870 155 26.541 195 8.900 235 3.972

36 8.513 76 19.758 116 47.599 156 26.541 196 8.809 236 2.762

37 8.521 77 20.074 117 47.782 157 24.741 197 8.778 237 2.459

38 8.521 78 21.338 118 48.047 158 24.741 198 8.655 238 1.727

39 8.546 79 21.338 119 48.445 159 23.698 199 8.655 239 0.630

40 8.563 80 22.670 120 48.445 160 23.002 200 8.581 240 0.630

Pick Everard Page 1



Leicester LE1 1HA


File S002KJD-Blocking the Att... Checked by ART




# - Indicates pipe length does not match coordinates

PN Length

(m)

Fall

(m)

Slope

(1:X)

I.Area

(ha)

T.E.

(mins)

Base

Flow (l/s)

k

(mm)

HYD

SECT

DIA

(mm)

Section Type

1.000 10.225 0.133 76.9 0.010 4.00 0.0 0.006 o 100 Pipe/Conduit

2.000 6.000 0.133 45.1 0.010 4.00 0.0 0.006 o 100 Pipe/Conduit

1.001 19.700# 0.177 111.3 0.000 4.00 0.0 0.006 o 150 Pipe/Conduit

3.000 11.000 0.200 55.0 0.010 4.00 0.0 0.006 o 100 Pipe/Conduit

3.001 7.200# 0.110 65.5 0.000 0.00 0.0 0.006 o 100 Pipe/Conduit

1.002 1.100 0.030 36.7 0.000 0.00 0.0 0.006 o 150 Pipe/Conduit

1.003 3.000 0.050 60.0 0.010 4.00 0.0 0.006 o 150 Pipe/Conduit

1.004 4.000 0.210 19.0 0.000 4.00 0.0 0.006 o 150 Pipe/Conduit

1.005 7.200 0.000 0.0 0.000 4.00 0.2 0.006 o 150 Pipe/Conduit


PN US/IL

(m)

Σ I.Area

(ha)

Σ Base

Flow (l/s)

Vel

(m/s)

Cap

(l/s)

1.000 85.200 0.010 0.0 1.20 9.4

2.000 85.200 0.010 0.0 1.61 12.7

1.001 85.067 0.020 0.0 1.28 22.7

3.000 85.200 0.010 0.0 1.45 11.4

3.001 85.000 0.010 0.0 1.31 10.3

1.002 84.890 0.030 0.0 2.35 41.6

1.003 84.860 0.040 0.0 1.80 31.8

1.004 84.810 0.040 0.0 3.36 59.4

1.005 84.600 0.040 0.2 0.00 0.0

Pick Everard Page 2



Leicester LE1 1HA






Pipe

Number

PIMP

Type

PIMP

Name

PIMP

(%)

Gross

Area (ha)

Imp.

Area (ha)

Pipe Total

(ha)

1.000 - - 100 0.010 0.010 0.010

2.000 - - 100 0.010 0.010 0.010

1.001 - - 100 0.000 0.000 0.000

3.000 - - 100 0.010 0.010 0.010

3.001 - - 100 0.000 0.000 0.000

1.002 - - 100 0.000 0.000 0.000

1.003 - - 100 0.010 0.010 0.010

1.004 - - 100 0.000 0.000 0.000

1.005 - - 100 0.000 0.000 0.000

Total Total Total

0.040 0.040 0.040


Outfall

Pipe Number

Outfall

Name

C. Level

(m)

I. Level

(m)

Min

I. Level

(m)

D,L

(mm)

W

(mm)

1.005 Culverted WC 85.500 84.600 84.600 1200 0















Ratio R 0.417

Pick Everard Page 3



Leicester LE1 1HA






Level Controlled Pump Manhole: Tank, DS/PN: 1.004, Volume (m³): 0.2

Invert Level (m) 84.810 Cut In Height (m) 0.790 Cut Out Height (m) 0.100

Depth (m) Outflow (l/s)

1.215 1.1500

Pick Everard Page 4



Leicester LE1 1HA






Simulation Criteria











M5-60 (mm) 19.200 Cv (Winter) 0.840



DTS Status ON

DVD Status ON

Inertia Status ON


Duration(s) (mins) 15, 30, 60, 120, 180, 240, 360, 480, 600, 720,

960, 1440



PN

US/MH

Name Storm

Return

Period

Climate

Change

First (X)

Surcharge

First (Y)

Flood

First (Z)

Overflow

Overflow

Act.

1.000 SWIC2 15 Winter 100 +40% 1/15 Summer 100/15 Summer

2.000 SWIC3g 15 Summer 100 +40% 1/15 Summer 100/15 Summer

1.001 SWIC3 180 Winter 100 +40% 1/15 Summer 30/30 Summer

3.000 SWIC4g 15 Winter 100 +40% 1/15 Summer 30/15 Summer

3.001 SWIC4 15 Summer 100 +40% 1/15 Summer 30/15 Winter

1.002 SWIC05 15 Summer 100 +40% 1/15 Summer 1/240 Winter

1.003 Silt Trap 15 Summer 100 +40% 1/15 Summer 1/240 Winter

1.004 Tank 180 Winter 100 +40% 1/15 Summer 1/30 Winter

1.005 SWMH3 60 Winter 100 +40%

Pick Everard Page 5



Leicester LE1 1HA






PN

US/MH

Name

Water

Level

(m)

Surcharged

Depth

(m)

Flooded

Volume

(m³)

Flow /

Cap.

Overflow

(l/s)

Pipe

Flow

(l/s) Status

Level

Exceeded

1.000 SWIC2 85.650 0.350 0.256 0.59 4.9 FLOOD 4

2.000 SWIC3g 85.650 0.350 0.045 0.60 6.1 FLOOD 2

1.001 SWIC3 85.610 0.393 9.697 0.03 0.5 FLOOD 40

3.000 SWIC4g 85.651 0.351 0.788 0.32 3.2 FLOOD 9

3.001 SWIC4 85.650 0.550 0.004 0.36 3.1 FLOOD 1

1.002 SWIC05 85.646 0.606 0.000 0.24 2.6 FLOOD RISK

1.003 Silt Trap 85.645 0.635 0.000 0.61 8.5 FLOOD RISK

1.004 Tank 85.606 0.646 5.874 0.03 0.8 FLOOD 72

1.005 SWMH3 84.635 -0.115 0.000 0.11 1.0 OK

Pick Everard Page 6



Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 31.912 4 76.779 7 286.184 10 201.074 13 60.653

2 58.234 5 124.277 8 332.425 11 124.277 14 58.235

3 60.652 6 201.074 9 286.184 12 76.779 15 31.912

Pick Everard Page 7



Leicester LE1 1HA




Rainfall Hyetograph for 15 minute 100 year Summer I+40%



Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 45.106 4 67.826 7 305.217 10 154.217 13 56.500

2 49.596 5 90.010 8 473.710 11 90.010 14 49.596

3 56.499 6 154.217 9 305.217 12 67.826 15 45.105

Pick Everard Page 8



Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 0.789 31 10.770 61 28.807 91 60.670 121 27.974 151 10.724

2 1.247 32 10.839 62 30.549 92 60.504 122 26.723 152 10.681

3 3.080 33 10.955 63 30.984 93 59.840 123 25.535 153 10.671

4 3.837 34 11.032 64 33.239 94 59.383 124 24.744 154 10.662

5 4.974 35 11.260 65 33.703 95 58.698 125 23.253 155 10.665

6 5.898 36 11.318 66 35.556 96 57.849 126 22.880 156 10.677

7 6.514 37 11.708 67 36.501 97 57.283 127 21.141 157 10.684

8 7.496 38 11.810 68 37.917 98 55.963 128 20.820 158 10.694

9 7.742 39 12.215 69 39.348 99 55.633 129 19.535 159 10.692

10 8.697 40 12.467 70 40.302 100 53.785 130 18.948 160 10.691

11 8.841 41 12.846 71 42.212 101 53.382 131 18.066 161 10.651

12 9.417 42 13.305 72 42.690 102 51.771 132 17.269 162 10.641

13 9.626 43 13.610 73 45.057 103 50.913 133 16.738 163 10.519

14 9.939 44 14.331 74 45.521 104 49.625 134 15.790 164 10.474

15 10.152 45 14.511 75 47.377 105 48.276 135 15.553 165 10.295

16 10.295 46 15.553 76 48.276 106 47.377 136 14.511 166 10.153

17 10.474 47 15.790 77 49.625 107 45.521 137 14.331 167 9.939

18 10.519 48 16.738 78 50.913 108 45.057 138 13.610 168 9.626

19 10.642 49 17.269 79 51.771 109 42.690 139 13.304 169 9.417

20 10.651 50 18.066 80 53.382 110 42.212 140 12.846 170 8.841

21 10.691 51 18.948 81 53.785 111 40.302 141 12.468 171 8.697

22 10.692 52 19.535 82 55.633 112 39.348 142 12.215 172 7.742

23 10.694 53 20.820 83 55.963 113 37.917 143 11.810 173 7.496

24 10.684 54 21.141 84 57.283 114 36.501 144 11.708 174 6.514

25 10.677 55 22.880 85 57.849 115 35.556 145 11.317 175 5.898

26 10.665 56 23.253 86 58.698 116 33.703 146 11.260 176 4.974

27 10.662 57 24.744 87 59.383 117 33.239 147 11.032 177 3.837

28 10.671 58 25.535 88 59.840 118 30.984 148 10.955 178 3.080

29 10.681 59 26.723 89 60.504 119 30.549 149 10.839 179 1.247

30 10.724 60 27.974 90 60.670 120 28.807 150 10.770 180 0.789

Pick Everard Page 9



Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 31.912 4 76.779 7 286.184 10 201.074 13 60.653

2 58.234 5 124.277 8 332.425 11 124.277 14 58.235

3 60.652 6 201.074 9 286.184 12 76.779 15 31.912




Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 45.106 4 67.826 7 305.217 10 154.217 13 56.500

2 49.596 5 90.010 8 473.710 11 90.010 14 49.596

3 56.499 6 154.217 9 305.217 12 67.826 15 45.105




Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 0.789 31 10.770 61 28.807 91 60.670 121 27.974 151 10.724

2 1.247 32 10.839 62 30.549 92 60.504 122 26.723 152 10.681

3 3.080 33 10.955 63 30.984 93 59.840 123 25.535 153 10.671

4 3.837 34 11.032 64 33.239 94 59.383 124 24.744 154 10.662

5 4.974 35 11.260 65 33.703 95 58.698 125 23.253 155 10.665

6 5.898 36 11.318 66 35.556 96 57.849 126 22.880 156 10.677

7 6.514 37 11.708 67 36.501 97 57.283 127 21.141 157 10.684

8 7.496 38 11.810 68 37.917 98 55.963 128 20.820 158 10.694

9 7.742 39 12.215 69 39.348 99 55.633 129 19.535 159 10.692

10 8.697 40 12.467 70 40.302 100 53.785 130 18.948 160 10.691

11 8.841 41 12.846 71 42.212 101 53.382 131 18.066 161 10.651

12 9.417 42 13.305 72 42.690 102 51.771 132 17.269 162 10.641

13 9.626 43 13.610 73 45.057 103 50.913 133 16.738 163 10.519

14 9.939 44 14.331 74 45.521 104 49.625 134 15.790 164 10.474

15 10.152 45 14.511 75 47.377 105 48.276 135 15.553 165 10.295

16 10.295 46 15.553 76 48.276 106 47.377 136 14.511 166 10.153

17 10.474 47 15.790 77 49.625 107 45.521 137 14.331 167 9.939

18 10.519 48 16.738 78 50.913 108 45.057 138 13.610 168 9.626

19 10.642 49 17.269 79 51.771 109 42.690 139 13.304 169 9.417

20 10.651 50 18.066 80 53.382 110 42.212 140 12.846 170 8.841

21 10.691 51 18.948 81 53.785 111 40.302 141 12.468 171 8.697

22 10.692 52 19.535 82 55.633 112 39.348 142 12.215 172 7.742

23 10.694 53 20.820 83 55.963 113 37.917 143 11.810 173 7.496

24 10.684 54 21.141 84 57.283 114 36.501 144 11.708 174 6.514

25 10.677 55 22.880 85 57.849 115 35.556 145 11.317 175 5.898

26 10.665 56 23.253 86 58.698 116 33.703 146 11.260 176 4.974

27 10.662 57 24.744 87 59.383 117 33.239 147 11.032 177 3.837

28 10.671 58 25.535 88 59.840 118 30.984 148 10.955 178 3.080

29 10.681 59 26.723 89 60.504 119 30.549 149 10.839 179 1.247

30 10.724 60 27.974 90 60.670 120 28.807 150 10.770 180 0.789




Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 3.865 11 24.601 21 68.251 31 136.752 41 60.613 51 24.233

2 11.112 12 25.392 22 77.435 32 132.912 42 53.546 52 24.178

3 16.433 13 26.995 23 85.948 33 127.585 43 46.460 53 24.228

4 20.364 14 29.175 24 94.590 34 120.074 44 41.010 54 24.163

5 22.450 15 32.072 25 104.222 35 112.426 45 36.325 55 23.638

6 23.638 16 36.325 26 112.426 36 104.222 46 32.071 56 22.451

7 24.163 17 41.010 27 120.074 37 94.589 47 29.176 57 20.364

8 24.228 18 46.460 28 127.585 38 85.948 48 26.995 58 16.433

9 24.178 19 53.546 29 132.912 39 77.435 49 25.392 59 11.112

10 24.233 20 60.613 30 136.752 40 68.251 50 24.601 60 3.864

Pick Everard Page 1


Charles Street

Leicester LE1 1HA


File S003KJD - 171541 - NORTH... Checked by ART




PN Length

(m)

Fall

(m)

Slope

(1:X)

I.Area

(ha)

T.E.

(mins)

Base

Flow (l/s)

k

(mm)

HYD

SECT

DIA

(mm)

Section Type

1.000 3.400 0.040 85.0 0.005 4.00 0.0 0.006 o 100 Pipe/Conduit

1.001 5.800 0.065 89.2 0.019 4.00 0.0 0.006 o 150 Pipe/Conduit

1.002 11.500 0.135 85.2 0.024 4.00 0.0 0.006 o 150 Pipe/Conduit

1.003 18.000 0.420 42.9 0.007 4.00 0.0 0.006 o 150 Pipe/Conduit

1.004 9.700 0.050 194.0 0.060 4.00 0.0 0.006 o 150 Pipe/Conduit

1.005 2.000 0.030 66.7 0.000 0.00 0.0 0.006 o 150 Pipe/Conduit


PN US/IL

(m)

Σ I.Area

(ha)

Σ Base

Flow (l/s)

Vel

(m/s)

Cap

(l/s)

1.000 85.260 0.005 0.0 1.14 8.9

1.001 85.220 0.024 0.0 1.45 25.6

1.002 85.155 0.048 0.0 1.49 26.3

1.003 85.020 0.055 0.0 2.16 38.2

1.004 84.600 0.115 0.0 0.94 16.7

1.005 84.550 0.115 0.0 1.70 30.0

Pick Everard Page 2


Charles Street

Leicester LE1 1HA






Pipe

Number

PIMP

Type

PIMP

Name

PIMP

(%)

Gross

Area (ha)

Imp.

Area (ha)

Pipe Total

(ha)

1.000 - - 100 0.005 0.005 0.005

1.001 - - 100 0.019 0.019 0.019

1.002 - - 100 0.024 0.024 0.024

1.003 - - 100 0.007 0.007 0.007

1.004 - - 100 0.060 0.060 0.060

1.005 - - 100 0.000 0.000 0.000

Total Total Total

0.115 0.115 0.115


Outfall

Pipe Number

Outfall

Name

C. Level

(m)

I. Level

(m)

Min

I. Level

(m)

D,L

(mm)

W

(mm)

1.005 EXSITING 85.200 84.520 84.520 150 600















Ratio R 0.417

Pick Everard Page 3


Charles Street

Leicester LE1 1HA






Orifice Manhole: SW SLIT TRAP 1, DS/PN: 1.004, Volume (m³): 1.2

Diameter (m) 0.050 Discharge Coefficient 0.600 Invert Level (m) 84.600

Pick Everard Page 4


Charles Street

Leicester LE1 1HA




Storage Structures for Storm


Cellular Storage Manhole: SW SLIT TRAP 1, DS/PN: 1.004

Invert Level (m) 84.600 Safety Factor 2.0

Infiltration Coefficient Base (m/hr) 0.00000 Porosity 0.95

Infiltration Coefficient Side (m/hr) 0.00000

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

0.000 60.0 60.0 0.500 0.0 72.8

0.400 60.0 72.8

Pick Everard Page 5


Charles Street

Leicester LE1 1HA






Simulation Criteria











M5-60 (mm) 19.200 Cv (Winter) 0.840



DTS Status ON

DVD Status ON

Inertia Status ON


Duration(s) (mins) 15, 30, 60, 120, 180, 240, 360, 480, 600, 720,

960, 1440



PN

US/MH

Name Storm

Return

Period

Climate

Change

First (X)

Surcharge

First (Y)

Flood

First (Z)

Overflow

1.000 SW IC 01 15 Winter 100 +40% 100/15 Summer



1.003 SW IC 04 60 Winter 100 +40% 100/15 Summer 100/15 Winter

1.004 SW SLIT TRAP 1 120 Winter 100 +40% 2/30 Summer 100/15 Summer

1.005 SW Orifice Chamber 120 Winter 100 +40%

PN

US/MH

Name

Overflow

Act.

Water

Level

(m)

Surcharged

Depth

(m)

Flooded

Volume

(m³)

Flow /

Cap.

Overflow

(l/s)

Pipe

Flow

(l/s) Status

1.000 SW IC 01 85.643 0.283 0.000 0.55 3.1 FLOOD RISK

1.001 SW IC 02 85.633 0.263 0.000 0.90 14.4 FLOOD RISK

1.002 SW IC 03 85.578 0.273 0.000 1.34 29.2 FLOOD RISK

Pick Everard Page 6


Charles Street

Leicester LE1 1HA






1.003 SW IC 04 85.451 0.281 1.463 0.50 16.9 FLOOD

1.004 SW SLIT TRAP 1 85.417 0.667 16.970 0.33 4.5 FLOOD

1.005 SW Orifice Chamber 84.617 -0.083 0.000 0.41 4.5 OK

PN

US/MH

Name

Overflow

Act.

Water

Level

(m)

Surcharged

Depth

(m)

Flooded

Volume

(m³)

Flow /

Cap.

Overflow

(l/s)

Pipe

Flow

(l/s) Status

PN

US/MH

Name

Level

Exceeded

1.000 SW IC 01

1.001 SW IC 02

1.002 SW IC 03

1.003 SW IC 04 8

1.004 SW SLIT TRAP 1 19

1.005 SW Orifice Chamber

Pick Everard Page 7


Charles Street

Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 31.912 4 76.779 7 286.184 10 201.074 13 60.653

2 58.234 5 124.277 8 332.425 11 124.277 14 58.235

3 60.652 6 201.074 9 286.184 12 76.779 15 31.912

Pick Everard Page 8


Charles Street

Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 31.912 4 76.779 7 286.184 10 201.074 13 60.653

2 58.234 5 124.277 8 332.425 11 124.277 14 58.235

3 60.652 6 201.074 9 286.184 12 76.779 15 31.912

Pick Everard Page 9


Charles Street

Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 31.912 4 76.779 7 286.184 10 201.074 13 60.653

2 58.234 5 124.277 8 332.425 11 124.277 14 58.235

3 60.652 6 201.074 9 286.184 12 76.779 15 31.912



Charles Street

Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 3.865 11 24.601 21 68.251 31 136.752 41 60.613 51 24.233

2 11.112 12 25.392 22 77.435 32 132.912 42 53.546 52 24.178

3 16.433 13 26.995 23 85.948 33 127.585 43 46.460 53 24.228

4 20.364 14 29.175 24 94.590 34 120.074 44 41.010 54 24.163

5 22.450 15 32.072 25 104.222 35 112.426 45 36.325 55 23.638

6 23.638 16 36.325 26 112.426 36 104.222 46 32.071 56 22.451

7 24.163 17 41.010 27 120.074 37 94.589 47 29.176 57 20.364

8 24.228 18 46.460 28 127.585 38 85.948 48 26.995 58 16.433

9 24.178 19 53.546 29 132.912 39 77.435 49 25.392 59 11.112

10 24.233 20 60.613 30 136.752 40 68.251 50 24.601 60 3.864



Charles Street

Leicester LE1 1HA







Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 1.076 21 14.712 41 39.861 61 82.699 81 37.562 101 14.603

2 3.574 22 14.880 42 42.234 62 81.794 82 35.346 102 14.545

3 5.747 23 15.115 43 45.308 63 80.633 83 33.220 103 14.533

4 7.619 24 15.427 44 47.835 64 79.239 84 31.188 104 14.549

5 9.214 25 15.959 45 50.397 65 77.632 85 28.818 105 14.568

6 10.553 26 16.512 46 52.985 66 75.833 86 27.066 106 14.575

7 11.855 27 17.166 47 55.586 67 73.313 87 25.427 107 14.559

8 12.640 28 17.927 48 58.190 68 71.117 88 23.902 108 14.505

9 13.263 29 18.797 49 61.416 69 68.813 89 22.493 109 14.339

10 13.741 30 19.780 50 63.947 70 66.418 90 21.200 110 14.094

11 14.094 31 21.200 51 66.418 71 63.947 91 19.780 111 13.742

12 14.339 32 22.493 52 68.813 72 61.416 92 18.797 112 13.263

13 14.505 33 23.902 53 71.117 73 58.190 93 17.927 113 12.640

14 14.559 34 25.427 54 73.313 74 55.587 94 17.167 114 11.854

15 14.575 35 27.066 55 75.833 75 52.985 95 16.512 115 10.553

16 14.568 36 28.818 56 77.632 76 50.397 96 15.959 116 9.214

17 14.549 37 31.188 57 79.239 77 47.835 97 15.427 117 7.619

18 14.533 38 33.220 58 80.633 78 45.308 98 15.115 118 5.747

19 14.545 39 35.346 59 81.794 79 42.234 99 14.880 119 3.573

20 14.603 40 37.562 60 82.699 80 39.861 100 14.712 120 1.075

Pick Everard Page 1


Charles Street

Leicester LE1 1HA


File S004KJD - 171541 - North... Checked by ART




PN Length

(m)

Fall

(m)

Slope

(1:X)

I.Area

(ha)

T.E.

(mins)

Base

Flow (l/s)

k

(mm)

HYD

SECT

DIA

(mm)

Section Type

1.000 3.400 0.040 85.0 0.005 4.00 0.0 0.006 o 100 Pipe/Conduit1.001 5.800 0.065 89.2 0.019 4.00 0.0 0.006 o 150 Pipe/Conduit1.002 11.500 0.135 85.2 0.024 4.00 0.0 0.006 o 150 Pipe/Conduit1.003 18.000 0.420 42.9 0.007 4.00 0.0 0.006 o 150 Pipe/Conduit1.004 9.700 0.050 194.0 0.060 4.00 0.0 0.006 o 150 Pipe/Conduit1.005 2.000 0.030 66.7 0.000 0.00 0.0 0.006 o 150 Pipe/Conduit


PN US/IL

(m)

Σ I.Area

(ha)

Σ Base

Flow (l/s)

Vel

(m/s)

Cap

(l/s)

1.000 85.260 0.005 0.0 1.14 8.91.001 85.220 0.024 0.0 1.45 25.61.002 85.155 0.048 0.0 1.49 26.31.003 85.020 0.055 0.0 2.16 38.21.004 84.600 0.115 0.0 0.94 16.71.005 84.550 0.115 0.0 1.70 30.0

Pick Everard Page 2


Charles Street

Leicester LE1 1HA






Pipe

Number

PIMP

Type

PIMP

Name

PIMP

(%)

Gross

Area (ha)

Imp.

Area (ha)

Pipe Total

(ha)

1.000 - - 100 0.005 0.005 0.0051.001 - - 100 0.019 0.019 0.0191.002 - - 100 0.024 0.024 0.0241.003 - - 100 0.007 0.007 0.0071.004 - - 100 0.060 0.060 0.0601.005 - - 100 0.000 0.000 0.000

Total Total Total0.115 0.115 0.115


Outfall

Pipe Number

Outfall

Name

C. Level

(m)

I. Level

(m)

Min

I. Level

(m)

D,L

(mm)

W

(mm)

1.005 EXSITING 85.200 84.520 84.520 150 600


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

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


Rainfall Model FSR Profile Type SummerReturn Period (years) 100 Cv (Summer) 0.750

Region England and Wales Cv (Winter) 0.840M5-60 (mm) 19.200 Storm Duration (mins) 30

Ratio R 0.417

Pick Everard Page 3


Charles Street

Leicester LE1 1HA






Orifice Manhole: SW SLIT TRAP 1, DS/PN: 1.004, Volume (m³): 1.2

Diameter (m) 0.050 Discharge Coefficient 0.600 Invert Level (m) 84.600

Pick Everard Page 4


Charles Street

Leicester LE1 1HA






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

Hot Start (mins) 0 MADD Factor * 10m³/ha Storage 0.000Hot 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

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

Synthetic Rainfall DetailsRainfall Model FSR Ratio R 0.417

Region England and Wales Cv (Summer) 0.750M5-60 (mm) 19.200 Cv (Winter) 0.840

Margin for Flood Risk Warning (mm) 200.0Analysis Timestep 2.5 Second Increment (Extended)

DTS Status ONDVD Status ON

Inertia Status ON

Profile(s) Summer and WinterDuration(s) (mins) 15, 30, 60, 120, 180, 240, 360, 480, 600, 720,

960, 1440Return Period(s) (years) 1, 2, 30, 100


PN

US/MH

Name Storm

Return

Period

Climate

Change

First (X)

Surcharge

First (Y)

Flood

First (Z)

Overflow

1.000 SW IC 01 15 Winter 100 +40% 1/15 Summer 100/15 Summer1.001 SW IC 02 15 Summer 100 +40% 1/15 Summer1.002 SW IC 03 15 Summer 100 +40% 1/15 Summer1.003 SW IC 04 15 Winter 100 +40% 1/15 Summer 2/15 Summer1.004 SW SLIT TRAP 1 120 Winter 100 +40% 1/15 Summer 1/15 Summer1.005 SW Orifice Chamber 120 Winter 100 +40%

PN

US/MH

Name

Overflow

Act.

Water

Level

(m)

Surcharged

Depth

(m)

Flooded

Volume

(m³)

Flow /

Cap.

Overflow

(l/s)

Pipe

Flow

(l/s) Status

1.000 SW IC 01 85.710 0.350 0.376 1.02 5.7 FLOOD1.001 SW IC 02 85.712 0.342 0.000 0.83 13.2 FLOOD RISK1.002 SW IC 03 85.675 0.370 0.000 1.29 28.2 FLOOD RISK

Pick Everard Page 5


Charles Street

Leicester LE1 1HA






1.003 SW IC 04 85.458 0.288 7.658 0.31 10.2 FLOOD1.004 SW SLIT TRAP 1 85.434 0.684 33.780 0.33 4.5 FLOOD1.005 SW Orifice Chamber 84.617 -0.083 0.000 0.42 4.5 OK

PN

US/MH

Name

Overflow

Act.

Water

Level

(m)

Surcharged

Depth

(m)

Flooded

Volume

(m³)

Flow /

Cap.

Overflow

(l/s)

Pipe

Flow

(l/s) Status

PN

US/MH

Name

Level

Exceeded

1.000 SW IC 01 31.001 SW IC 021.002 SW IC 031.003 SW IC 04 161.004 SW SLIT TRAP 1 521.005 SW Orifice Chamber

Pick Everard Page 6


Charles Street

Leicester LE1 1HA




Rainfall Hyetograph for 15 minute 100 year Winter I+40%for Pipe 1.000 (Storm)


Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 31.912 4 76.779 7 286.184 10 201.074 13 60.6532 58.234 5 124.277 8 332.425 11 124.277 14 58.2353 60.652 6 201.074 9 286.184 12 76.779 15 31.912

Pick Everard Page 7


Charles Street

Leicester LE1 1HA




Rainfall Hyetograph for 15 minute 100 year Summer I+40%for Pipe 1.001 (Storm)


Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 45.106 4 67.826 7 305.217 10 154.217 13 56.5002 49.596 5 90.010 8 473.710 11 90.010 14 49.5963 56.499 6 154.217 9 305.217 12 67.826 15 45.105

Pick Everard Page 8


Charles Street

Leicester LE1 1HA




Rainfall Hyetograph for 15 minute 100 year Summer I+40%for Pipe 1.002 (Storm)


Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 45.106 4 67.826 7 305.217 10 154.217 13 56.5002 49.596 5 90.010 8 473.710 11 90.010 14 49.5963 56.499 6 154.217 9 305.217 12 67.826 15 45.105

Pick Everard Page 9


Charles Street

Leicester LE1 1HA






Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 31.912 4 76.779 7 286.184 10 201.074 13 60.6532 58.234 5 124.277 8 332.425 11 124.277 14 58.2353 60.652 6 201.074 9 286.184 12 76.779 15 31.912



Charles Street

Leicester LE1 1HA






Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

Time

(mins)

Rain

(mm/hr)

1 1.076 21 14.712 41 39.861 61 82.699 81 37.562 101 14.6032 3.574 22 14.880 42 42.234 62 81.794 82 35.346 102 14.5453 5.747 23 15.115 43 45.308 63 80.633 83 33.220 103 14.5334 7.619 24 15.427 44 47.835 64 79.239 84 31.188 104 14.5495 9.214 25 15.959 45 50.397 65 77.632 85 28.818 105 14.5686 10.553 26 16.512 46 52.985 66 75.833 86 27.066 106 14.5757 11.855 27 17.166 47 55.586 67 73.313 87 25.427 107 14.5598 12.640 28 17.927 48 58.190 68 71.117 88 23.902 108 14.5059 13.263 29 18.797 49 61.416 69 68.813 89 22.493 109 14.33910 13.741 30 19.780 50 63.947 70 66.418 90 21.200 110 14.09411 14.094 31 21.200 51 66.418 71 63.947 91 19.780 111 13.74212 14.339 32 22.493 52 68.813 72 61.416 92 18.797 112 13.26313 14.505 33 23.902 53 71.117 73 58.190 93 17.927 113 12.64014 14.559 34 25.427 54 73.313 74 55.587 94 17.167 114 11.85415 14.575 35 27.066 55 75.833 75 52.985 95 16.512 115 10.55316 14.568 36 28.818 56 77.632 76 50.397 96 15.959 116 9.21417 14.549 37 31.188 57 79.239 77 47.835 97 15.427 117 7.61918 14.533 38 33.220 58 80.633 78 45.308 98 15.115 118 5.74719 14.545 39 35.346 59 81.794 79 42.234 99 14.880 119 3.57320 14.603 40 37.562 60 82.699 80 39.861 100 14.712 120 1.075

Drainage Strategy


Appendix K

Overland Flooding Route For The Surface Water

<50mm

<10mm

Revision 1P01 01.12.17 R.I.MRevision Date Drn

CDM - RESIDUAL HAZARDS

1

2

3 etc.

Further possible control measures have been identified within the Design RiskAssessments which may help to mitigate these and other identified risksfurther during the construction / maintenance process.

S2 - Suitable for Information

Client

Job No.

Suitability Status

Drawing Number

@ A1Scale

Project

NO DIMENSIONS TO BE SCALED FROM THIS DRAWING

This drawing is issued for the sole and exclusive use of the intended recipient and issubject to copyright in favour of Pick Everard. Pick Everard does not accept anyresponsibility or liability whatsoever for its use by a person other than the intendedrecipient.

Size

Drawing Title

T 0345 045 0050 www.pickeverard.co.uk

CDM - RESIDUAL HAZARDS The following are considered to be significant risksrelevant to this drawing, which could not be fully mitigated or removed throughdesign:

Project Code - Originator - Zone - Level - Type - Role - Number

171541



Overland Flood Routes - Southwest Discharge Point

1:100

171541-PEV-XX-ZZ-DR-C-0500

SW MH

cl 85.51

il 84.85

Ecophon Gedina suspended ceiling to

new Circulation area with black painted

perimeter edge shadow battening.

Ceiling grid hung off direct fix brackets.

+

FFL 86.250

W1

+ 85.650

+

85.570

+

85.610

+ 85.175

+ 85.413

+ 85.531

+ 85.295

+ 85.500

+ 85.320

+ 85.400

+ 85.248

+ 85.284

+ 85.212

+ 85.640

+

85.480

+ 85.570

A

Inv 85.02

CL 85.45

SW IC 4

+

+ 85.685

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

ne

w 5

0 x

1

50

mm

e

dg

in

g k

erb

ne

w 5

0 x

1

50

mm

e

dg

in

g k

erb

ne

w 5

0 x

1

50

mm

e

dg

in

g k

erb

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

n

e

w

5

0

x

1

5

0

m

m

e

d

g

in

g

k

e

r

b

N

E

W

A

C

O

S

U

R

F

A

C

E

W

A

T

E

R

D

R

A

IN

A

G

E

C

H

A

N

N

E

L

N

E

W

A

C

O

S

U

R

F

A

C

E

W

A

T

E

R

D

R

A

IN

A

G

E

C

H

A

N

N

E

L

N

E

W

A

C

O

S

U

R

F

A

C

E

W

A

T

E

R

D

R

A

IN

A

G

E

C

H

A

N

N

E

L

N

E

W

A

C

O

S

U

R

F

A

C

E

W

A

T

E

R

D

R

A

IN

A

G

E

C

H

A

N

N

E

L

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

AREA

NEW GRASSED

Proposed new tarmacadam playground

pipe Inv 84.55

CL 85.20

SW Orifice chamber

chamber base 83.97

Inv 84.6

CL 85.40 TBC

SW silt trap 1

trap base 84.10

Permavoid 150 storage tank below playgroun level

Aquacell Prime size 10266 x 4248mm x 300mm

with welded impermeable membrane surround

volume 13.38m3

tank base level 84.60

tank top level.84.90

SW

S 1

50m

m d

ia p

ipe

S

W

S

1

5

0

m

m

d

ia

p

ip

e

air vent to Permavoid

1200mm dia. concrete ring Orifice chamber on 225mm

mass concrete base, 150mm channel,

see detail of typical

silt trap

Revision 1P01 02.03.18 K.J.DRevision Date Drn

CDM - RESIDUAL HAZARDS

1

2

3 etc.

Further possible control measures have been identified within the Design RiskAssessments which may help to mitigate these and other identified risksfurther during the construction / maintenance process.

S2 - Suitable for Information

Client

Job No.

Suitability Status

Drawing Number

@ A1Scale

Project

NO DIMENSIONS TO BE SCALED FROM THIS DRAWING

This drawing is issued for the sole and exclusive use of the intended recipient and issubject to copyright in favour of Pick Everard. Pick Everard does not accept anyresponsibility or liability whatsoever for its use by a person other than the intendedrecipient.

Size

Drawing Title

T 0345 045 0050 www.pickeverard.co.uk

CDM - RESIDUAL HAZARDS The following are considered to be significant risksrelevant to this drawing, which could not be fully mitigated or removed throughdesign:

Project Code - Originator - Zone - Level - Type - Role - Number

171541



Overland Flood Routes - Northwest

1:75

171541-PEV-XX-ZZ-DR-C-0500

drainage strategy

Documents