polegate yard, east sussex slr ref: 416.0978.00005 january 2011 · 2014. 6. 5. · haulaway ltd 1...

Polegate Yard, East Sussex

SLR Ref: 416.0978.00005

January 2011

Version: Rev 1

Haulaway Ltd i SLR Ref No: 416.0978.00005 Polegate Yard, East Sussex January 2011

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CONTENTS

1.0 INTRODUCTION .......................................................................................................... 1

1.1 Context .............................................................................................................. 1

1.2 Site Location and Features .............................................................................. 1

1.3 Development Proposals ................................................................................... 2

1.4 Site Data ............................................................................................................ 2

1.5 Flood Zone Classification ................................................................................ 2

1.6 Appropriateness of Development Proposals .................................................. 3

1.7 Sequential Test ................................................................................................. 3

1.8 Exception Test .................................................................................................. 3

1.9 Project Scope .................................................................................................... 3

2.0 DRAINAGE ASSESSMENT ......................................................................................... 5

2.1 Introduction ....................................................................................................... 5

2.2 Estimation of Greenfield Runoff Rates ............................................................ 5

2.3 Estimation of Required Surface Water Storage .............................................. 6

2.4 Proposed Mitigation ......................................................................................... 7

2.5 Water Quality ..................................................................................................... 8

2.6 Disposal of Surface Water Runoff ................................................................... 8

3.0 SUMMARY AND CONCLUSIONS ............................................................................... 9

4.0 CLOSURE .................................................................................................................. 10

TABLES

Table 1-1 Summary of Existing Site Drainage Infrastructure ........................................... 1

Table 1-2 Potential Risk Posed by Flooding Sources ...................................................... 3

Table 2-1 Summary of Greenfield Run-off Rates .............................................................. 6

Table 2-2 Summary of Impervious Areas .......................................................................... 6

Table 2-3 Summary of Required Surface Water Storage .................................................. 7

DRAWINGS

Drawing 001 Site Location Plan

Drawing 002 Proposed Site Layout

Drawing 003 Existing Site Layout and Topographical Survey

Drawing 004 Environment Agency Flood Map

APPENDICES

Appendix A Workings

Appendix B Envirocheck Report Site Sensitivity Map Section A13 (1:2500)

Haulaway Ltd 1 SLR Ref No: 416.0978.00005 Polegate Yard, East Sussex January 2011

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1.0 INTRODUCTION

1.1 Context

SLR Consulting Limited (SLR) has been appointed by Haulaway Ltd to undertake a Flood Risk Assessment (FRA) in support of a planning application for a proposed Recycling Facility at Polegate Yard, East Sussex, NGR 558259, 106969. This document has been prepared in accordance with Planning Policy Statement 25: Development and Flood Risk.

1.2 Site Location and Features

The site is located to the north of Polegate, just off the A22, and is bound by scrub and scattered woodland to the south and east, and by woodland opening onto farmland to the north and west.

A series of five ponds are located to the south and east of the site; refer to Drawing 003 - Site Location Plan and Surface Water Features. These ponds appear to be man-made although it is not clear for what purpose. They are currently used for fishing. No drainage from the site currently discharges to the ponds.

The Envirocheck Report1 prepared for the site refers to a discharge consent from one of the ponds (south east of the site) to a tributary of the Holme Sewer, which was previously held by Tarmac Ltd for the discharge of process water between 1992-2008, ref. PO4232. This has since been revoked.

Three drainage holding tanks are located within the site, which provide a total existing surface water storage volume of 96m3. The site currently drains to a wheel washer on the northern boundary. Water from this tank is then pumped to a settlement tank located in the south eastern corner of the site. From here it drains into a tank on the south eastern boundary (slightly north east of the settlement tank) from where it drains to ground. The dimensions of these tanks are contained in Table 1-1 below:

Table 1-1 Summary of Existing Site Drainage Infrastructure

Tank Reference Location Surface Area

(m2)

Volume (m

3)

1 Northern Boundary 15m2 15

2 South Eastern Corner 28m2 66

3 South Eastern Boundary 12m2 15

Total 96

The site covers an area of approximately 0.8ha although the area for the proposed development is considerably smaller. The application site was previously used for the storage of concrete and aggregate, and as a waste transfer station. An existing area of hardstanding (~2800m2) is located in the north eastern section of the site. Part of the south

1 October 2010. Envirocheck Report 32914666_1_1.


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western area of the site was previously used as a landfill, refer to Envirocheck Report Site Sensitivity Map Section A13 at Appendix B.

Topographic survey information (see Drawing No. 001) indicates that site elevations range from approximately 14.5m AOD to 17.8m AOD. The highest levels are seen within a central ridge trending north west – south east, with levels falling on either side in a north easterly and south westerly direction. It is likely that the levels within the site have been altered by previous site activities.

Groundwater Vulnerability Mapping Sheet 46: East Sussex shows the site to be located within a non Aquifer. British Geological Survey Mapping, Sheet 319 shows the geology at this location to be impermeable comprising Weald Clay.

1.3 Development Proposals

It is proposed to retain the existing site area in the north east but to input a number of skips and storage areas for the storage of inert recycling and dry plastic recyclables. The area in the south western section of the site, which is comprised of a restored landfill, will be used for the following:

• Concrete Crusher

• Soil screener

• Topsoil storage area

• Concrete stock pile for crushing

The development proposals will not significantly alter land levels or the proportion of impervious surface.

Access to the site will be provided through the existing route located on the northern boundary and which links via Summerhill Lane to the A22.

A Development Proposals plan is included as Drawing 002. This indicates the site layout, including the proposed access road, Recycling facility and associated plant storage areas.

1.4 Site Data

Data has been obtained from the following locations for use in this assessment:

� Environment Agency Flood Mapping (November 2010) � Flood Estimation Handbook CD ROM V3 � Site topographical survey October 2010 � Envirocheck Report (October 2010) � WINDES MicroDrainage surface water modelling Software

1.5 Flood Zone Classification

Review of the Environment Agency Flood Zone Map (included at Appendix A) shows the site to be located within Flood Zone 1 (indicating a less than 0.1% annual chance of flooding).


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1.6 Appropriateness of Development Proposals

Table D.3 of Planning Policy Statement 25: Development and Flood Risk (PPS25) sets out that waste treatment facilities are designated as a ‘less vulnerable’ use and are appropriate in Flood Zone 1.

1.7 Sequential Test

According to PPS25 the Sequential Test gives preference to locating new development in Flood Zone 1. The application site is located within Flood Zone 1 and therefore the current proposals meet the requirements of the Sequential Test.

1.8 Exception Test

The site is deemed to pass the Sequential Test in line with Table D3 of PPS25, and the Exception Test need not be applied.

1.9 Project Scope

Table 1-2 summarises the flood risks to the site.

Table 1-2 Potential Risk Posed by Flooding Sources

Potential Source Potential Flood Risk to Application Site?

Justification

Fluvial flooding No

Flood Zone 1 Tidal / tidally influenced flooding No

Flood Defence Breach (Failure) No

Flooding from rising / high groundwater

No

The impervious underlying strata and presence of existing

concrete pad would limit the upward migration of

groundwater.

Overland flow flooding Yes

Potential overland flow flooding originates from

surface water runoff discharged from hardstanding

areas

Flooding from artificial drainage systems

No No utility pipelines found

within the vicinity of the site

Flooding due to infrastructure failure No

No water storage structures are found within the vicinity of

the site

The key flood risk to the site is shown to be from surface water runoff. This assessment will therefore take the form of a surface water drainage assessment. Given the size of the site and that the development proposals will not greatly alter the proportion of impervious area it


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is not considered that the proposals will not result in a significant increase in the volume and rate of run-off post development. .


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2.0 DRAINAGE ASSESSMENT

2.1 Introduction

The site is to be refurbished to include a waste recycling area for skip storage, and the processing of inert waste and dry plastic recyclables, within the existing hardstanding area in the north east of the site. This will not result in any increase in hardstanding areas within this section of the site.

Associated plant including a concrete crusher and soil screener will be located in the south west of the site. This area will also include an area for the storage of concrete for crushing and topsoil. Additional hardstanding areas will be required in this area of the site.

The development proposals will not significantly alter the existing surface water run-off regime. This drainage assessment will therefore compare the existing runoff regime with that for the future including climate change and will seek to provide storage for surface water runoff to prevent any increase in flood risk as a result of development proposals.

This assessment has been completed with due regard to the principals of PPS25 and using the current ‘industry best practice’ guidance as outlined in the Interim Code of Practice for SuDS2 and the recommended methodology for consideration of surface water runoff from sites up to 50 hectares in area, outlined within the Institute of Hydrology Report 124 Method (IoH124).

2.2 Estimation of Greenfield Runoff Rates

The Greenfield runoff rates for the site have been calculated using the Institute of Hydrology (IoH) report 124: Flood Estimation for Smaller Catchments, within the WinDes MicroDrainage Software package.

The following parameters have been incorporated into the runoff calculations:

• Average Annual Rainfall (SAAR): 794mm/year (from Flood Estimation Handbook CD-

ROM);

• Soil: 0.45;

• Total Existing Impermeable Area 4190m2;

(measured using AutoCAD from the site survey); and

• FSR Region 7 - Devon & Cornwall – Growth Curve Factors

Table 2-1 below summarises the Greenfield runoff rates calculated for the site.

2 Office of the Deputy Prime Minister, National SuDS Working Group, July 2004, Interim Code of

Practice for Sustainable Drainage Systems


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Table 2-1 Summary of Greenfield Run-off Rates

Return Period (years)

Greenfield runoff* rates

(l/s/ha)

Waste Processing

Area (l/s)

Plant & Stockpile

Areas (l/s)

Mean Annual Flood

5.1 2.14 0.81

2 year 4.5 1.88 0.72

30 year 11.5 4.82 1.82

100 year 16.2 6.79 2.58

Note * Runoff rates linearly interpolated from a 50ha donor catchment

2.3 Estimation of Required Surface Water Storage

The WinDes software suite has been used to calculate the surface water storage volume required in order to limit the discharge rate to the greenfield run-off rates summarised in Table 2-1, above. In order to achieve this, the site has been split into two separate catchment areas, as follows:

• Waste processing area (north east)

• Plant and stockpile areas (south west)

Table 2-2 summarises the impervious areas within each of these catchments:

Table 2-2 Summary of Impervious Areas

Catchment Impervious area (m

2)

Waste processing

4190

Plant / Stockpile

1590

The total impervious area within the proposed site comprises 5780m2, 4190m2 of which is already in existence, with a total increase in impervious area of 1590m2 resulting from development proposals. It can therefore be concluded that these proposals will not significantly alter the surface water runoff regime within the site, or lead to a significant increase in flood risk at the site or to third party land.

As the site contains existing impervious areas, it is proposed to investigate the existing and future storage requirements (including 20% climate change in line with a development lifetime of 50 years) and to provide storage to accommodate the difference between these in order to ensure that existing runoff rates are not exceeded.


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Based on the calculations the following storage requirements have been estimated for the site for existing and future extreme rainfall events.

Table 2-3 Summary of Required Surface Water Storage

Return Period (years)

Waste Processing Area

Difference Plant & Stockpile

Areas Existing Future (2050)

2 year 91 114 23 45

30 year 148 184 36 50

100 year 192 237 45 75

This leads to a maximum storage requirement of 120m3 in addition to the 96m3 already provided within the site. Section 2.4 summarises the means of providing this level of storage.

2.4 Proposed Mitigation

It is proposed that attenuation storage be provided within the site. The following options are available for the provision of this level of storage. These are presented in order of preference accounting for SuDS and ecology:

• Attenuation pond(s)

• Swales

• Oversized pipes

• Tank / storm cells

In terms of maintaining freely discharging systems, without the requirement for pumping, attenuation ponds would provide the greatest flexibility.

The adopted storage area(s) will be sized to contain runoff for the 100 year event including climate change at 20% and will include a degree of freeboard to allow for fluctuation in water levels and settlement at the pond edges. Surface water will be discharged to the storage area via a piped network or intercept ditches. These will be sized to accommodate runoff from events up to 30 years with no flooding of above ground areas. Surface water runoff from rainfall events of between 30 years and 100 years will be conveyed to the storage area via a combination of piped drainage and overland flowpaths. This will be achieved using ground contouring and profiling.

Discharge from the storage area(s) would be controlled and limited to existing Greenfield rates. Emergency sluices/shut off valves would be fitted to the outfalls to permit isolation in the event of accidental spillage or contamination of surface water by site processes or firewater.

Topographically it would be best to locate the storage area(s) in the south eastern areas of the site to allow freely draining systems. Intercept drainage will be provided to direct surface water to the storage area.


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2.5 Water Quality

Given the nature of site use any runoff from hardstanding areas used for vehicle movements should be directed to the storage area via a Class 1 oil interceptor. This should be located immediately upstream of the storage area and should be specified according to the area of hardstanding which it drains and in accordance with the manufacturers recommendations.

2.6 Disposal of Surface Water Runoff

It is proposed to discharge surface water runoff from the storage area to the drainage channel (a tributary of the Holme Sewer), located on the northern boundary of the site. It is likely that the outfall will be located in the north eastern corner of the waste processing area. A consent for the discharge of process water from a pond to the south east of the site was previously held by Tarmac. Although this discharge consent has been revoked, it may be possible to discharge via existing infrastructure to the Holme Sewer via this route under a new consent. This would require a discharge consent to be obtained from the Environment Agency. In the event that the construction of a new outfall structure is required this would be subject to formal Flood Defence Consent which should be obtained from the Environment Agency.


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3.0 SUMMARY AND CONCLUSIONS

SLR Consulting Limited (SLR) has been appointed by Haulaway Ltd to undertake a Flood Risk Assessment (FRA) in support of an application for a proposed Waste Processing Plant on land at Polegate Yard, East Sussex.

Based upon the indicative EA Flood Maps, the site is indicated to lie within in Flood Zone 1 and is therefore not at flood risk from fluvial sources.

It is proposed to provide a total additional surface water storage volume of 120m3 within the site using a combination of below ground storage and floodable areas. A number of storm tanks are already present within the site and it is proposed to retain this storage in addition to that proposed. This existing surface water storage volume (96m3) should be retained and / or included within the proposed attenuation facilities.

The existing drainage facilities within the site include a pumped drainage solution, whereas the proposed drainage design will move to gravity drainage thus reducing the risk of pump failure and increased flooding, resulting in a beneficial impact on surface water flood risk at the site.

It can be concluded that development proposals will not significantly alter the surface water runoff regime within the site, or lead to a consequent significant increase in flood risk at the site or to third party land. SuDS techniques are proposed in order to control and manage the surface water runoff risk, thus mitigating potential impacts on the existing surface water runoff regime.

Surface water runoff from the site will be discharged at controlled rates to a tributary of the Holme Sewer located on the northern boundary.

The site is duly presented as being sustainable in terms of flood risk, subject to proposed mitigation measures being implemented.


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4.0 CLOSURE

This report has been prepared by SLR Consulting Limited with all reasonable skill, care and diligence, and taking account of the manpower and resources devoted to it by agreement with the client. Information reported herein is based on the interpretation of data collected and has been accepted in good faith as being accurate and valid.

This report is for the exclusive use of Haulaway Ltd; no warranties or guarantees are expressed or should be inferred by any third parties. This report may not be relied upon by other parties without written consent from SLR.

SLR disclaims any responsibility to the client and others in respect of any matters outside the agreed scope of the work.

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DRAWINGS

DRAWING 1 SITE LOCATION PLAN

DRAWING 2 PROPOSED SITE LAYOUT

DRAWING 3 EXISTING SITE LAYOUT AND TOPOGRAPHICAL SURVEY

DRAWING 4 ENVIRONMENT AGENCY FLOOD MAP

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APPENDIX A Workings

ICP SUDS Mean Annual Flood

Input

Return Period (years) 100 Soil 0.450

Area (ha) 1.000 Urban 0.000

SAAR (mm) 794 Region Number Region 7

Results l/s

QBAR Rural 5.1

QBAR Urban 5.1

Q100 years 16.2

Q1 year 4.3

Q30 years 11.5

Q100 years 16.2

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IH 124 Mean Annual Flood

Input

Return Period (years) 100 Soil 0.450

Area (ha) 50.000 Urban 0.000

SAAR (mm) 794 Region Number Region 7

Results l/s

QBAR Rural 254.5

QBAR Urban 254.5

Q100 years 812.0

Q1 year 216.4

Q2 years 224.3

Q5 years 325.8

Q10 years 412.4

Q20 years 509.9

Q25 years 546.8

Q30 years 576.9

Q50 years 666.9

Q100 years 812.0

Q200 years 954.6

Q250 years 1000.4

Q1000 years 1313.5

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Summary of Results for 2 year Return Period (+20%)

Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Summer 0.081 0.081 0.3 0.0 0.3 12.1 O K

30 min Summer 0.103 0.103 0.3 0.0 0.3 15.4 O K

60 min Summer 0.130 0.130 0.3 0.0 0.3 19.5 O K

120 min Summer 0.163 0.163 0.3 0.0 0.3 24.4 O K

180 min Summer 0.184 0.184 0.3 0.0 0.3 27.6 O K

240 min Summer 0.200 0.200 0.3 0.0 0.3 30.0 O K

360 min Summer 0.222 0.222 0.3 0.0 0.3 33.3 O K

480 min Summer 0.237 0.237 0.3 0.0 0.3 35.6 O K

600 min Summer 0.248 0.248 0.3 0.0 0.3 37.1 O K

720 min Summer 0.255 0.255 0.4 0.0 0.4 38.2 O K

960 min Summer 0.260 0.260 0.4 0.0 0.4 39.0 O K

1440 min Summer 0.264 0.264 0.4 0.0 0.4 39.6 O K

2160 min Summer 0.264 0.264 0.4 0.0 0.4 39.6 O K

2880 min Summer 0.259 0.259 0.4 0.0 0.4 38.9 O K

4320 min Summer 0.263 0.263 0.4 0.0 0.4 39.4 O K

5760 min Summer 0.260 0.260 0.4 0.0 0.4 39.1 O K

7200 min Summer 0.255 0.255 0.4 0.0 0.4 38.3 O K

8640 min Summer 0.249 0.249 0.3 0.0 0.3 37.3 O K

10080 min Summer 0.241 0.241 0.3 0.0 0.3 36.2 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Summer 41.341 0.0 19

30 min Summer 26.444 0.0 34

60 min Summer 16.915 0.0 64

120 min Summer 10.820 0.0 124

180 min Summer 8.331 0.0 182

240 min Summer 6.921 0.0 242

360 min Summer 5.329 0.0 362

480 min Summer 4.427 0.0 482

600 min Summer 3.834 0.0 600

720 min Summer 3.409 0.0 720

960 min Summer 2.780 0.0 836

1440 min Summer 2.086 0.0 1084

2160 min Summer 1.565 0.0 1492

2880 min Summer 1.276 0.0 1908

4320 min Summer 1.008 0.0 2764

5760 min Summer 0.852 0.0 3576

7200 min Summer 0.748 0.0 4400

8640 min Summer 0.673 0.0 5192

10080 min Summer 0.615 0.0 6048

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Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Winter 0.091 0.091 0.3 0.0 0.3 13.6 O K

30 min Winter 0.115 0.115 0.3 0.0 0.3 17.3 O K

60 min Winter 0.146 0.146 0.3 0.0 0.3 21.9 O K

120 min Winter 0.183 0.183 0.3 0.0 0.3 27.4 O K

180 min Winter 0.207 0.207 0.3 0.0 0.3 31.1 O K

240 min Winter 0.225 0.225 0.3 0.0 0.3 33.8 O K

360 min Winter 0.251 0.251 0.4 0.0 0.4 37.7 O K

480 min Winter 0.269 0.269 0.4 0.0 0.4 40.3 O K

600 min Winter 0.282 0.282 0.4 0.0 0.4 42.3 O K

720 min Winter 0.292 0.292 0.4 0.0 0.4 43.7 O K

960 min Winter 0.298 0.298 0.4 0.0 0.4 44.7 O K

1440 min Winter 0.301 0.301 0.4 0.0 0.4 45.2 O K

2160 min Winter 0.299 0.299 0.4 0.0 0.4 44.9 O K

2880 min Winter 0.291 0.291 0.4 0.0 0.4 43.6 O K

4320 min Winter 0.288 0.288 0.4 0.0 0.4 43.2 O K

5760 min Winter 0.278 0.278 0.4 0.0 0.4 41.7 O K

7200 min Winter 0.265 0.265 0.4 0.0 0.4 39.8 O K

8640 min Winter 0.252 0.252 0.4 0.0 0.4 37.8 O K

10080 min Winter 0.238 0.238 0.3 0.0 0.3 35.7 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Winter 41.341 0.0 19

30 min Winter 26.444 0.0 33

60 min Winter 16.915 0.0 62

120 min Winter 10.820 0.0 122

180 min Winter 8.331 0.0 180

240 min Winter 6.921 0.0 238

360 min Winter 5.329 0.0 354

480 min Winter 4.427 0.0 468

600 min Winter 3.834 0.0 582

720 min Winter 3.409 0.0 694

960 min Winter 2.780 0.0 906

1440 min Winter 2.086 0.0 1140

2160 min Winter 1.565 0.0 1604

2880 min Winter 1.276 0.0 2072

4320 min Winter 1.008 0.0 2980

5760 min Winter 0.852 0.0 3864

7200 min Winter 0.748 0.0 4688

8640 min Winter 0.673 0.0 5536

10080 min Winter 0.615 0.0 6360

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Rainfall Details

Rainfall Model FEH D3 (1km) 0.434 Cv (Winter) 0.840

Return Period (years) 2 E (1km) 0.310 Shortest Storm (mins) 15

Site Location F (1km) 2.431 Longest Storm (mins) 10080

C (1km) -0.024 Summer Storms Yes Climate Change % +20

D1 (1km) 0.372 Winter Storms Yes

D2 (1km) 0.308 Cv (Summer) 0.750

Time / Area Diagram

Total Area (ha) 0.159

Time

(mins)

Area

(ha)

0-4 0.159

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Model Details

Storage is Online Cover Level (m) 1.000

Tank or Pond Structure

Invert Level (m) 0.000

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

0.000 150.0 1.000 150.0

Hydro-Brake® Outflow Control

Design Head (m) 1.000 Hydro-Brake® Type Md4 Invert Level (m) 0.000

Design Flow (l/s) 0.7 Diameter (mm) 30

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

0.100 0.3 1.200 0.8 3.000 1.3 7.000 1.9

0.200 0.3 1.400 0.9 3.500 1.4 7.500 2.0

0.300 0.4 1.600 0.9 4.000 1.4 8.000 2.0

0.400 0.5 1.800 1.0 4.500 1.5 8.500 2.1

0.500 0.5 2.000 1.0 5.000 1.6 9.000 2.2

0.600 0.6 2.200 1.1 5.500 1.7 9.500 2.2

0.800 0.6 2.400 1.1 6.000 1.8

1.000 0.7 2.600 1.2 6.500 1.8

Weir Overflow Control

Discharge Coef 0.544 Width (m) 1.000 Invert Level (m) 0.900

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Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Summer 0.193 0.193 3.6 0.0 3.6 29.0 O K

30 min Summer 0.228 0.228 3.6 0.0 3.6 34.2 O K

60 min Summer 0.262 0.262 3.6 0.0 3.6 39.3 O K

120 min Summer 0.286 0.286 3.6 0.0 3.6 42.9 O K

180 min Summer 0.294 0.294 3.6 0.0 3.6 44.1 O K

240 min Summer 0.296 0.296 3.6 0.0 3.6 44.5 O K

360 min Summer 0.292 0.292 3.6 0.0 3.6 43.8 O K

480 min Summer 0.281 0.281 3.6 0.0 3.6 42.2 O K

600 min Summer 0.267 0.267 3.6 0.0 3.6 40.1 O K

720 min Summer 0.251 0.251 3.6 0.0 3.6 37.7 O K

960 min Summer 0.211 0.211 3.6 0.0 3.6 31.6 O K

1440 min Summer 0.158 0.158 3.6 0.0 3.6 23.8 O K

2160 min Summer 0.125 0.125 3.1 0.0 3.1 18.7 O K

2880 min Summer 0.108 0.108 2.7 0.0 2.7 16.2 O K

4320 min Summer 0.093 0.093 2.2 0.0 2.2 13.9 O K

5760 min Summer 0.084 0.084 1.8 0.0 1.8 12.5 O K

7200 min Summer 0.077 0.077 1.6 0.0 1.6 11.6 O K

8640 min Summer 0.073 0.073 1.5 0.0 1.5 10.9 O K

10080 min Summer 0.069 0.069 1.3 0.0 1.3 10.3 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Summer 104.130 0.0 18

30 min Summer 63.691 0.0 32

60 min Summer 38.957 0.0 62

120 min Summer 23.828 0.0 108

180 min Summer 17.873 0.0 140

240 min Summer 14.574 0.0 172

360 min Summer 10.932 0.0 242

480 min Summer 8.914 0.0 310

600 min Summer 7.610 0.0 378

720 min Summer 6.687 0.0 442

960 min Summer 5.353 0.0 560

1440 min Summer 3.912 0.0 782

2160 min Summer 2.859 0.0 1128

2880 min Summer 2.289 0.0 1496

4320 min Summer 1.761 0.0 2204

5760 min Summer 1.462 0.0 2936

7200 min Summer 1.265 0.0 3672

8640 min Summer 1.124 0.0 4408

10080 min Summer 1.018 0.0 5136

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 16/11/2010 15:09

File 101116-0978-Stock...

Micro Drainage


Checked By


Page 1



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Winter 0.218 0.218 3.6 0.0 3.6 32.7 O K

30 min Winter 0.259 0.259 3.6 0.0 3.6 38.8 O K

60 min Winter 0.298 0.298 3.6 0.0 3.6 44.8 O K

120 min Winter 0.327 0.327 3.6 0.0 3.6 49.1 O K

180 min Winter 0.332 0.332 3.6 0.0 3.6 49.8 O K

240 min Winter 0.333 0.333 3.6 0.0 3.6 49.9 O K

360 min Winter 0.321 0.321 3.6 0.0 3.6 48.2 O K

480 min Winter 0.301 0.301 3.6 0.0 3.6 45.2 O K

600 min Winter 0.276 0.276 3.6 0.0 3.6 41.5 O K

720 min Winter 0.248 0.248 3.6 0.0 3.6 37.2 O K

960 min Winter 0.187 0.187 3.6 0.0 3.6 28.0 O K

1440 min Winter 0.133 0.133 3.3 0.0 3.3 19.9 O K

2160 min Winter 0.105 0.105 2.6 0.0 2.6 15.7 O K

2880 min Winter 0.091 0.091 2.1 0.0 2.1 13.6 O K

4320 min Winter 0.078 0.078 1.6 0.0 1.6 11.7 O K

5760 min Winter 0.070 0.070 1.4 0.0 1.4 10.5 O K

7200 min Winter 0.065 0.065 1.2 0.0 1.2 9.8 O K

8640 min Winter 0.061 0.061 1.1 0.0 1.1 9.2 O K

10080 min Winter 0.058 0.058 1.0 0.0 1.0 8.7 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Winter 104.130 0.0 18

30 min Winter 63.691 0.0 32

60 min Winter 38.957 0.0 60

120 min Winter 23.828 0.0 116

180 min Winter 17.873 0.0 150

240 min Winter 14.574 0.0 186

360 min Winter 10.932 0.0 264

480 min Winter 8.914 0.0 338

600 min Winter 7.610 0.0 410

720 min Winter 6.687 0.0 476

960 min Winter 5.353 0.0 580

1440 min Winter 3.912 0.0 794

2160 min Winter 2.859 0.0 1144

2880 min Winter 2.289 0.0 1500

4320 min Winter 1.761 0.0 2208

5760 min Winter 1.462 0.0 2944

7200 min Winter 1.265 0.0 3664

8640 min Winter 1.124 0.0 4400

10080 min Winter 1.018 0.0 5048

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 16/11/2010 15:09

File 101116-0978-Stock...

Micro Drainage


Checked By


Page 2


Rainfall Details






D2 (1km) 0.308 Cv (Summer) 0.750

Time / Area Diagram


Time

(mins)

Area

(ha)

0-4 0.159

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 16/11/2010 15:09

File 101116-0978-Stock...

Micro Drainage


Checked By


Page 3


Model Details





0.000 150.0 1.000 150.0





0.100 2.4 1.200 5.4 3.000 8.6 7.000 13.1

0.200 3.4 1.400 5.9 3.500 9.3 7.500 13.6

0.300 3.0 1.600 6.3 4.000 9.9 8.000 14.0

0.400 3.2 1.800 6.7 4.500 10.5 8.500 14.5

0.500 3.5 2.000 7.0 5.000 11.1 9.000 14.9

0.600 3.8 2.200 7.4 5.500 11.6 9.500 15.3

0.800 4.4 2.400 7.7 6.000 12.2

1.000 5.0 2.600 8.0 6.500 12.7



SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 16/11/2010 15:09

File 101116-0978-Stock...

Micro Drainage


Checked By


Page 4



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Summer 0.300 0.300 3.6 0.0 3.6 45.0 O K

30 min Summer 0.351 0.351 3.6 0.0 3.6 52.6 O K

60 min Summer 0.400 0.400 3.6 0.0 3.6 59.9 O K

120 min Summer 0.434 0.434 3.6 0.0 3.6 65.1 O K

180 min Summer 0.441 0.441 3.6 0.0 3.6 66.1 O K

240 min Summer 0.443 0.443 3.6 0.0 3.6 66.4 O K

360 min Summer 0.437 0.437 3.6 0.0 3.6 65.6 O K

480 min Summer 0.426 0.426 3.6 0.0 3.6 63.9 O K

600 min Summer 0.412 0.412 3.6 0.0 3.6 61.8 O K

720 min Summer 0.396 0.396 3.6 0.0 3.6 59.4 O K

960 min Summer 0.354 0.354 3.6 0.0 3.6 53.0 O K

1440 min Summer 0.269 0.269 3.6 0.0 3.6 40.4 O K

2160 min Summer 0.171 0.171 3.6 0.0 3.6 25.7 O K

2880 min Summer 0.136 0.136 3.4 0.0 3.4 20.3 O K

4320 min Summer 0.111 0.111 2.8 0.0 2.8 16.6 O K

5760 min Summer 0.098 0.098 2.3 0.0 2.3 14.7 O K

7200 min Summer 0.089 0.089 2.0 0.0 2.0 13.4 O K

8640 min Summer 0.083 0.083 1.8 0.0 1.8 12.4 O K

10080 min Summer 0.078 0.078 1.7 0.0 1.7 11.7 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Summer 158.066 0.0 18

30 min Summer 94.745 0.0 33

60 min Summer 56.790 0.0 62

120 min Summer 34.040 0.0 120

180 min Summer 25.233 0.0 156

240 min Summer 20.404 0.0 188

360 min Summer 15.125 0.0 254

480 min Summer 12.230 0.0 324

600 min Summer 10.372 0.0 392

720 min Summer 9.066 0.0 462

960 min Summer 7.197 0.0 598

1440 min Summer 5.198 0.0 852

2160 min Summer 3.755 0.0 1168

2880 min Summer 2.981 0.0 1500

4320 min Summer 2.266 0.0 2208

5760 min Summer 1.865 0.0 2936

7200 min Summer 1.604 0.0 3672

8640 min Summer 1.418 0.0 4408

10080 min Summer 1.277 0.0 5136

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 16/11/2010 15:07

File 101116-0978-Stock...

Micro Drainage


Checked By


Page 1



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Winter 0.337 0.337 3.6 0.0 3.6 50.6 O K

30 min Winter 0.395 0.395 3.6 0.0 3.6 59.2 O K

60 min Winter 0.450 0.450 3.6 0.0 3.6 67.6 O K

120 min Winter 0.493 0.493 3.6 0.0 3.6 74.0 O K

180 min Winter 0.503 0.503 3.6 0.0 3.6 75.4 O K

240 min Winter 0.501 0.501 3.6 0.0 3.6 75.1 O K

360 min Winter 0.492 0.492 3.6 0.0 3.6 73.7 O K

480 min Winter 0.473 0.473 3.6 0.0 3.6 70.9 O K

600 min Winter 0.450 0.450 3.6 0.0 3.6 67.5 O K

720 min Winter 0.425 0.425 3.6 0.0 3.6 63.8 O K

960 min Winter 0.361 0.361 3.6 0.0 3.6 54.2 O K

1440 min Winter 0.220 0.220 3.6 0.0 3.6 33.0 O K

2160 min Winter 0.132 0.132 3.3 0.0 3.3 19.9 O K

2880 min Winter 0.109 0.109 2.7 0.0 2.7 16.4 O K

4320 min Winter 0.091 0.091 2.1 0.0 2.1 13.6 O K

5760 min Winter 0.081 0.081 1.7 0.0 1.7 12.1 O K

7200 min Winter 0.074 0.074 1.5 0.0 1.5 11.1 O K

8640 min Winter 0.069 0.069 1.3 0.0 1.3 10.4 O K

10080 min Winter 0.066 0.066 1.2 0.0 1.2 9.8 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Winter 158.066 0.0 18

30 min Winter 94.745 0.0 32

60 min Winter 56.790 0.0 60

120 min Winter 34.040 0.0 118

180 min Winter 25.233 0.0 170

240 min Winter 20.404 0.0 196

360 min Winter 15.125 0.0 272

480 min Winter 12.230 0.0 350

600 min Winter 10.372 0.0 426

720 min Winter 9.066 0.0 500

960 min Winter 7.197 0.0 646

1440 min Winter 5.198 0.0 882

2160 min Winter 3.755 0.0 1168

2880 min Winter 2.981 0.0 1500

4320 min Winter 2.266 0.0 2208

5760 min Winter 1.865 0.0 2936

7200 min Winter 1.604 0.0 3656

8640 min Winter 1.418 0.0 4408

10080 min Winter 1.277 0.0 5136

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 16/11/2010 15:07

File 101116-0978-Stock...

Micro Drainage


Checked By


Page 2


Rainfall Details






D2 (1km) 0.308 Cv (Summer) 0.750

Time / Area Diagram


Time

(mins)

Area

(ha)

0-4 0.159

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 16/11/2010 15:07

File 101116-0978-Stock...

Micro Drainage


Checked By


Page 3


Model Details





0.000 150.0 1.000 150.0





0.100 2.4 1.200 5.4 3.000 8.6 7.000 13.1

0.200 3.4 1.400 5.9 3.500 9.3 7.500 13.6

0.300 3.0 1.600 6.3 4.000 9.9 8.000 14.0

0.400 3.2 1.800 6.7 4.500 10.5 8.500 14.5

0.500 3.5 2.000 7.0 5.000 11.1 9.000 14.9

0.600 3.8 2.200 7.4 5.500 11.6 9.500 15.3

0.800 4.4 2.400 7.7 6.000 12.2

1.000 5.0 2.600 8.0 6.500 12.7



SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 16/11/2010 15:07

File 101116-0978-Stock...

Micro Drainage


Checked By


Page 4


Summary of Results for 2 year Return Period

Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Summer 0.076 0.076 0.9 0.0 0.9 26.6 O K

30 min Summer 0.096 0.096 1.1 0.0 1.1 33.5 O K

60 min Summer 0.120 0.120 1.1 0.0 1.1 42.0 O K

120 min Summer 0.149 0.149 1.1 0.0 1.1 52.3 O K

180 min Summer 0.168 0.168 1.1 0.0 1.1 59.0 O K

240 min Summer 0.182 0.182 1.1 0.0 1.1 63.8 O K

360 min Summer 0.202 0.202 1.1 0.0 1.1 70.5 O K

480 min Summer 0.214 0.214 1.1 0.0 1.1 74.8 O K

600 min Summer 0.222 0.222 1.1 0.0 1.1 77.6 O K

720 min Summer 0.228 0.228 1.1 0.0 1.1 79.7 O K

960 min Summer 0.231 0.231 1.1 0.0 1.1 81.0 O K

1440 min Summer 0.233 0.233 1.1 0.0 1.1 81.5 O K

2160 min Summer 0.228 0.228 1.1 0.0 1.1 79.7 O K

2880 min Summer 0.219 0.219 1.1 0.0 1.1 76.5 O K

4320 min Summer 0.212 0.212 1.1 0.0 1.1 74.1 O K

5760 min Summer 0.200 0.200 1.1 0.0 1.1 69.9 O K

7200 min Summer 0.185 0.185 1.1 0.0 1.1 64.7 O K

8640 min Summer 0.168 0.168 1.1 0.0 1.1 58.9 O K

10080 min Summer 0.150 0.150 1.1 0.0 1.1 52.6 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Summer 34.451 0.0 19

30 min Summer 22.037 0.0 33

60 min Summer 14.096 0.0 62

120 min Summer 9.016 0.0 122

180 min Summer 6.943 0.0 182

240 min Summer 5.767 0.0 242

360 min Summer 4.441 0.0 362

480 min Summer 3.689 0.0 480

600 min Summer 3.195 0.0 582

720 min Summer 2.841 0.0 628

960 min Summer 2.317 0.0 760

1440 min Summer 1.738 0.0 1024

2160 min Summer 1.304 0.0 1444

2880 min Summer 1.064 0.0 1848

4320 min Summer 0.840 0.0 2680

5760 min Summer 0.710 0.0 3512

7200 min Summer 0.624 0.0 4320

8640 min Summer 0.561 0.0 5024

10080 min Summer 0.513 0.0 5752

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 06/01/2011 12:47

File 101116-0978-Recyc...

Micro Drainage


Checked By


Page 1



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Winter 0.085 0.085 1.0 0.0 1.0 29.8 O K

30 min Winter 0.108 0.108 1.1 0.0 1.1 37.7 O K

60 min Winter 0.135 0.135 1.1 0.0 1.1 47.3 O K

120 min Winter 0.169 0.169 1.1 0.0 1.1 59.0 O K

180 min Winter 0.190 0.190 1.1 0.0 1.1 66.6 O K

240 min Winter 0.206 0.206 1.1 0.0 1.1 72.2 O K

360 min Winter 0.228 0.228 1.1 0.0 1.1 79.9 O K

480 min Winter 0.243 0.243 1.1 0.0 1.1 85.0 O K

600 min Winter 0.253 0.253 1.1 0.0 1.1 88.4 O K

720 min Winter 0.260 0.260 1.1 0.0 1.1 90.8 O K

960 min Winter 0.261 0.261 1.1 0.0 1.1 91.5 O K

1440 min Winter 0.261 0.261 1.1 0.0 1.1 91.5 O K

2160 min Winter 0.251 0.251 1.1 0.0 1.1 87.8 O K

2880 min Winter 0.235 0.235 1.1 0.0 1.1 82.2 O K

4320 min Winter 0.216 0.216 1.1 0.0 1.1 75.6 O K

5760 min Winter 0.189 0.189 1.1 0.0 1.1 66.3 O K

7200 min Winter 0.156 0.156 1.1 0.0 1.1 54.4 O K

8640 min Winter 0.122 0.122 1.1 0.0 1.1 42.8 O K

10080 min Winter 0.103 0.103 1.1 0.0 1.1 36.1 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Winter 34.451 0.0 18

30 min Winter 22.037 0.0 33

60 min Winter 14.096 0.0 62

120 min Winter 9.016 0.0 120

180 min Winter 6.943 0.0 180

240 min Winter 5.767 0.0 238

360 min Winter 4.441 0.0 352

480 min Winter 3.689 0.0 466

600 min Winter 3.195 0.0 576

720 min Winter 2.841 0.0 684

960 min Winter 2.317 0.0 864

1440 min Winter 1.738 0.0 1096

2160 min Winter 1.304 0.0 1560

2880 min Winter 1.064 0.0 2016

4320 min Winter 0.840 0.0 2896

5760 min Winter 0.710 0.0 3752

7200 min Winter 0.624 0.0 4536

8640 min Winter 0.561 0.0 5096

10080 min Winter 0.513 0.0 5648

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 06/01/2011 12:47

File 101116-0978-Recyc...

Micro Drainage


Checked By


Page 2


Rainfall Details






D2 (1km) 0.308 Cv (Summer) 0.750

Time / Area Diagram


Time

(mins)

Area

(ha)

0-4 0.419

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 06/01/2011 12:47

File 101116-0978-Recyc...

Micro Drainage


Checked By


Page 3


Model Details





0.000 350.0 1.000 350.0





0.100 1.1 1.200 2.1 3.000 3.4 7.000 5.1

0.200 0.9 1.400 2.3 3.500 3.6 7.500 5.3

0.300 1.1 1.600 2.5 4.000 3.9 8.000 5.5

0.400 1.2 1.800 2.6 4.500 4.1 8.500 5.7

0.500 1.4 2.000 2.7 5.000 4.3 9.000 5.8

0.600 1.5 2.200 2.9 5.500 4.5 9.500 6.0

0.800 1.7 2.400 3.0 6.000 4.7

1.000 1.9 2.600 3.1 6.500 4.9



SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 06/01/2011 12:47

File 101116-0978-Recyc...

Micro Drainage


Checked By


Page 4



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Summer 0.189 0.189 3.5 0.0 3.5 66.1 O K

30 min Summer 0.228 0.228 3.5 0.0 3.5 79.7 O K

60 min Summer 0.271 0.271 3.5 0.0 3.5 95.0 O K

120 min Summer 0.317 0.317 3.5 0.0 3.5 111.0 O K

180 min Summer 0.341 0.341 3.5 0.0 3.5 119.3 O K

240 min Summer 0.354 0.354 3.5 0.0 3.5 124.0 O K

360 min Summer 0.366 0.366 3.5 0.0 3.5 128.3 O K

480 min Summer 0.373 0.373 3.5 0.0 3.5 130.4 O K

600 min Summer 0.375 0.375 3.5 0.0 3.5 131.3 O K

720 min Summer 0.375 0.375 3.5 0.0 3.5 131.4 O K

960 min Summer 0.363 0.363 3.5 0.0 3.5 127.0 O K

1440 min Summer 0.333 0.333 3.5 0.0 3.5 116.4 O K

2160 min Summer 0.283 0.283 3.5 0.0 3.5 99.0 O K

2880 min Summer 0.232 0.232 3.5 0.0 3.5 81.0 O K

4320 min Summer 0.175 0.175 3.5 0.0 3.5 61.4 O K

5760 min Summer 0.146 0.146 3.4 0.0 3.4 51.1 O K

7200 min Summer 0.130 0.130 3.2 0.0 3.2 45.4 O K

8640 min Summer 0.118 0.118 2.9 0.0 2.9 41.4 O K

10080 min Summer 0.111 0.111 2.7 0.0 2.7 38.7 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Summer 86.775 0.0 18

30 min Summer 53.076 0.0 33

60 min Summer 32.464 0.0 62

120 min Summer 19.857 0.0 122

180 min Summer 14.894 0.0 182

240 min Summer 12.145 0.0 240

360 min Summer 9.110 0.0 322

480 min Summer 7.429 0.0 382

600 min Summer 6.341 0.0 446

720 min Summer 5.572 0.0 514

960 min Summer 4.461 0.0 654

1440 min Summer 3.260 0.0 924

2160 min Summer 2.383 0.0 1324

2880 min Summer 1.908 0.0 1700

4320 min Summer 1.467 0.0 2376

5760 min Summer 1.218 0.0 3056

7200 min Summer 1.054 0.0 3744

8640 min Summer 0.937 0.0 4416

10080 min Summer 0.848 0.0 5144

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:24

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 1



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Winter 0.212 0.212 3.5 0.0 3.5 74.3 O K

30 min Winter 0.256 0.256 3.5 0.0 3.5 89.7 O K

60 min Winter 0.306 0.306 3.5 0.0 3.5 107.1 O K

120 min Winter 0.358 0.358 3.5 0.0 3.5 125.3 O K

180 min Winter 0.386 0.386 3.5 0.0 3.5 135.0 O K

240 min Winter 0.402 0.402 3.5 0.0 3.5 140.8 O K

360 min Winter 0.418 0.418 3.5 0.0 3.5 146.3 O K

480 min Winter 0.421 0.421 3.5 0.0 3.5 147.5 O K

600 min Winter 0.423 0.423 3.5 0.0 3.5 148.0 O K

720 min Winter 0.422 0.422 3.5 0.0 3.5 147.6 O K

960 min Winter 0.403 0.403 3.5 0.0 3.5 140.9 O K

1440 min Winter 0.356 0.356 3.5 0.0 3.5 124.7 O K

2160 min Winter 0.276 0.276 3.5 0.0 3.5 96.8 O K

2880 min Winter 0.194 0.194 3.5 0.0 3.5 67.9 O K

4320 min Winter 0.138 0.138 3.3 0.0 3.3 48.2 O K

5760 min Winter 0.117 0.117 2.9 0.0 2.9 40.9 O K

7200 min Winter 0.105 0.105 2.5 0.0 2.5 36.7 O K

8640 min Winter 0.097 0.097 2.3 0.0 2.3 33.8 O K

10080 min Winter 0.091 0.091 2.1 0.0 2.1 31.7 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Winter 86.775 0.0 18

30 min Winter 53.076 0.0 33

60 min Winter 32.464 0.0 62

120 min Winter 19.857 0.0 120

180 min Winter 14.894 0.0 178

240 min Winter 12.145 0.0 234

360 min Winter 9.110 0.0 342

480 min Winter 7.429 0.0 436

600 min Winter 6.341 0.0 472

720 min Winter 5.572 0.0 550

960 min Winter 4.461 0.0 704

1440 min Winter 3.260 0.0 1010

2160 min Winter 2.383 0.0 1428

2880 min Winter 1.908 0.0 1732

4320 min Winter 1.467 0.0 2376

5760 min Winter 1.218 0.0 3056

7200 min Winter 1.054 0.0 3752

8640 min Winter 0.937 0.0 4488

10080 min Winter 0.848 0.0 5144

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:24

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 2


Rainfall Details






D2 (1km) 0.308 Cv (Summer) 0.750

Time / Area Diagram


Time

(mins)

Area

(ha)

0-4 0.419

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:24

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 3


Model Details





0.000 350.0 1.000 350.0





0.100 2.4 1.200 5.3 3.000 8.4 7.000 12.9

0.200 3.3 1.400 5.8 3.500 9.1 7.500 13.3

0.300 2.9 1.600 6.1 4.000 9.7 8.000 13.7

0.400 3.1 1.800 6.5 4.500 10.3 8.500 14.2

0.500 3.4 2.000 6.9 5.000 10.9 9.000 14.6

0.600 3.8 2.200 7.2 5.500 11.4 9.500 15.0

0.800 4.3 2.400 7.5 6.000 11.9

1.000 4.9 2.600 7.8 6.500 12.4



SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:24

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 4



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Summer 0.286 0.286 5.4 0.0 5.4 100.2 O K

30 min Summer 0.338 0.338 5.4 0.0 5.4 118.4 O K

60 min Summer 0.393 0.393 5.4 0.0 5.4 137.7 O K

120 min Summer 0.445 0.445 5.4 0.0 5.4 155.8 O K

180 min Summer 0.468 0.468 5.4 0.0 5.4 163.7 O K

240 min Summer 0.477 0.477 5.4 0.0 5.4 166.9 O K

360 min Summer 0.483 0.483 5.4 0.0 5.4 169.0 O K

480 min Summer 0.483 0.483 5.4 0.0 5.4 169.0 O K

600 min Summer 0.479 0.479 5.4 0.0 5.4 167.7 O K

720 min Summer 0.473 0.473 5.4 0.0 5.4 165.6 O K

960 min Summer 0.446 0.446 5.4 0.0 5.4 156.1 O K

1440 min Summer 0.390 0.390 5.4 0.0 5.4 136.6 O K

2160 min Summer 0.305 0.305 5.4 0.0 5.4 106.9 O K

2880 min Summer 0.230 0.230 5.4 0.0 5.4 80.6 O K

4320 min Summer 0.174 0.174 5.3 0.0 5.3 60.8 O K

5760 min Summer 0.148 0.148 4.8 0.0 4.8 51.8 O K

7200 min Summer 0.133 0.133 4.3 0.0 4.3 46.6 O K

8640 min Summer 0.123 0.123 3.9 0.0 3.9 43.0 O K

10080 min Summer 0.115 0.115 3.5 0.0 3.5 40.3 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Summer 131.722 0.0 19

30 min Summer 78.954 0.0 33

60 min Summer 47.325 0.0 62

120 min Summer 28.367 0.0 122

180 min Summer 21.027 0.0 180

240 min Summer 17.003 0.0 240

360 min Summer 12.604 0.0 296

480 min Summer 10.192 0.0 360

600 min Summer 8.644 0.0 426

720 min Summer 7.555 0.0 494

960 min Summer 5.998 0.0 634

1440 min Summer 4.332 0.0 908

2160 min Summer 3.129 0.0 1296

2880 min Summer 2.484 0.0 1616

4320 min Summer 1.888 0.0 2292

5760 min Summer 1.554 0.0 2992

7200 min Summer 1.336 0.0 3680

8640 min Summer 1.181 0.0 4408

10080 min Summer 1.064 0.0 5144

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:21

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 1



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Winter 0.322 0.322 5.4 0.0 5.4 112.7 O K

30 min Winter 0.380 0.380 5.4 0.0 5.4 133.1 O K

60 min Winter 0.443 0.443 5.4 0.0 5.4 155.0 O K

120 min Winter 0.503 0.503 5.4 0.0 5.4 175.9 O K

180 min Winter 0.530 0.530 5.4 0.0 5.4 185.6 O K

240 min Winter 0.543 0.543 5.4 0.0 5.4 190.2 O K

360 min Winter 0.548 0.548 5.4 0.0 5.4 191.9 O K

480 min Winter 0.545 0.545 5.4 0.0 5.4 190.8 O K

600 min Winter 0.539 0.539 5.4 0.0 5.4 188.5 O K

720 min Winter 0.528 0.528 5.4 0.0 5.4 184.9 O K

960 min Winter 0.489 0.489 5.4 0.0 5.4 171.0 O K

1440 min Winter 0.405 0.405 5.4 0.0 5.4 141.8 O K

2160 min Winter 0.266 0.266 5.4 0.0 5.4 93.2 O K

2880 min Winter 0.182 0.182 5.3 0.0 5.3 63.5 O K

4320 min Winter 0.139 0.139 4.5 0.0 4.5 48.7 O K

5760 min Winter 0.121 0.121 3.8 0.0 3.8 42.2 O K

7200 min Winter 0.109 0.109 3.3 0.0 3.3 38.2 O K

8640 min Winter 0.101 0.101 2.9 0.0 2.9 35.4 O K

10080 min Winter 0.095 0.095 2.6 0.0 2.6 33.3 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Winter 131.722 0.0 18

30 min Winter 78.954 0.0 33

60 min Winter 47.325 0.0 62

120 min Winter 28.367 0.0 120

180 min Winter 21.027 0.0 176

240 min Winter 17.003 0.0 232

360 min Winter 12.604 0.0 334

480 min Winter 10.192 0.0 378

600 min Winter 8.644 0.0 456

720 min Winter 7.555 0.0 534

960 min Winter 5.998 0.0 686

1440 min Winter 4.332 0.0 982

2160 min Winter 3.129 0.0 1344

2880 min Winter 2.484 0.0 1616

4320 min Winter 1.888 0.0 2292

5760 min Winter 1.554 0.0 3000

7200 min Winter 1.336 0.0 3680

8640 min Winter 1.181 0.0 4408

10080 min Winter 1.064 0.0 5144

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:21

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 2


Rainfall Details






D2 (1km) 0.308 Cv (Summer) 0.750

Time / Area Diagram


Time

(mins)

Area

(ha)

0-4 0.419

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:21

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 3


Model Details





0.000 350.0 1.000 350.0





0.100 2.8 1.200 7.5 3.000 11.9 7.000 18.2

0.200 5.4 1.400 8.1 3.500 12.9 7.500 18.8

0.300 4.6 1.600 8.7 4.000 13.7 8.000 19.4

0.400 4.5 1.800 9.2 4.500 14.6 8.500 20.0

0.500 4.9 2.000 9.7 5.000 15.4 9.000 20.6

0.600 5.3 2.200 10.2 5.500 16.1 9.500 21.2

0.800 6.1 2.400 10.6 6.000 16.8

1.000 6.9 2.600 11.1 6.500 17.5



SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:21

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 4



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Summer 0.091 0.091 1.1 0.0 1.1 31.9 O K

30 min Summer 0.115 0.115 1.1 0.0 1.1 40.4 O K

60 min Summer 0.145 0.145 1.1 0.0 1.1 50.9 O K

120 min Summer 0.182 0.182 1.1 0.0 1.1 63.6 O K

180 min Summer 0.206 0.206 1.1 0.0 1.1 71.9 O K

240 min Summer 0.223 0.223 1.1 0.0 1.1 78.0 O K

360 min Summer 0.247 0.247 1.1 0.0 1.1 86.4 O K

480 min Summer 0.262 0.262 1.1 0.0 1.1 91.9 O K

600 min Summer 0.273 0.273 1.1 0.0 1.1 95.6 O K

720 min Summer 0.280 0.280 1.1 0.0 1.1 98.1 O K

960 min Summer 0.285 0.285 1.1 0.0 1.1 99.8 O K

1440 min Summer 0.289 0.289 1.1 0.0 1.1 101.0 O K

2160 min Summer 0.285 0.285 1.1 0.0 1.1 99.9 O K

2880 min Summer 0.277 0.277 1.1 0.0 1.1 97.1 O K

4320 min Summer 0.275 0.275 1.1 0.0 1.1 96.3 O K

5760 min Summer 0.267 0.267 1.1 0.0 1.1 93.3 O K

7200 min Summer 0.256 0.256 1.1 0.0 1.1 89.5 O K

8640 min Summer 0.243 0.243 1.1 0.0 1.1 85.1 O K

10080 min Summer 0.230 0.230 1.1 0.0 1.1 80.5 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Summer 41.341 0.0 19

30 min Summer 26.444 0.0 33

60 min Summer 16.915 0.0 64

120 min Summer 10.820 0.0 122

180 min Summer 8.331 0.0 182

240 min Summer 6.921 0.0 242

360 min Summer 5.329 0.0 362

480 min Summer 4.427 0.0 480

600 min Summer 3.834 0.0 600

720 min Summer 3.409 0.0 684

960 min Summer 2.780 0.0 792

1440 min Summer 2.086 0.0 1052

2160 min Summer 1.565 0.0 1468

2880 min Summer 1.276 0.0 1876

4320 min Summer 1.008 0.0 2724

5760 min Summer 0.852 0.0 3528

7200 min Summer 0.748 0.0 4328

8640 min Summer 0.673 0.0 5184

10080 min Summer 0.615 0.0 5952

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 06/01/2011 12:49

File 101116-0978-Recyc...

Micro Drainage


Checked By


Page 1



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Winter 0.102 0.102 1.1 0.0 1.1 35.7 O K

30 min Winter 0.130 0.130 1.1 0.0 1.1 45.3 O K

60 min Winter 0.164 0.164 1.1 0.0 1.1 57.3 O K

120 min Winter 0.205 0.205 1.1 0.0 1.1 71.6 O K

180 min Winter 0.231 0.231 1.1 0.0 1.1 81.0 O K

240 min Winter 0.251 0.251 1.1 0.0 1.1 87.9 O K

360 min Winter 0.279 0.279 1.1 0.0 1.1 97.6 O K

480 min Winter 0.298 0.298 1.1 0.0 1.1 104.1 O K

600 min Winter 0.311 0.311 1.1 0.0 1.1 108.7 O K

720 min Winter 0.320 0.320 1.1 0.0 1.1 112.0 O K

960 min Winter 0.325 0.325 1.1 0.0 1.1 113.6 O K

1440 min Winter 0.326 0.326 1.1 0.0 1.1 114.2 O K

2160 min Winter 0.319 0.319 1.1 0.0 1.1 111.6 O K

2880 min Winter 0.305 0.305 1.1 0.0 1.1 106.6 O K

4320 min Winter 0.292 0.292 1.1 0.0 1.1 102.2 O K

5760 min Winter 0.272 0.272 1.1 0.0 1.1 95.3 O K

7200 min Winter 0.250 0.250 1.1 0.0 1.1 87.4 O K

8640 min Winter 0.225 0.225 1.1 0.0 1.1 78.6 O K

10080 min Winter 0.196 0.196 1.1 0.0 1.1 68.6 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Winter 41.341 0.0 19

30 min Winter 26.444 0.0 33

60 min Winter 16.915 0.0 62

120 min Winter 10.820 0.0 120

180 min Winter 8.331 0.0 180

240 min Winter 6.921 0.0 238

360 min Winter 5.329 0.0 354

480 min Winter 4.427 0.0 468

600 min Winter 3.834 0.0 578

720 min Winter 3.409 0.0 688

960 min Winter 2.780 0.0 894

1440 min Winter 2.086 0.0 1112

2160 min Winter 1.565 0.0 1580

2880 min Winter 1.276 0.0 2044

4320 min Winter 1.008 0.0 2940

5760 min Winter 0.852 0.0 3808

7200 min Winter 0.748 0.0 4680

8640 min Winter 0.673 0.0 5536

10080 min Winter 0.615 0.0 6352

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 06/01/2011 12:49

File 101116-0978-Recyc...

Micro Drainage


Checked By


Page 2


Rainfall Details






D2 (1km) 0.308 Cv (Summer) 0.750

Time / Area Diagram


Time

(mins)

Area

(ha)

0-4 0.419

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 06/01/2011 12:49

File 101116-0978-Recyc...

Micro Drainage


Checked By


Page 3


Model Details





0.000 350.0 1.000 350.0





0.100 1.1 1.200 2.1 3.000 3.4 7.000 5.1

0.200 0.9 1.400 2.3 3.500 3.6 7.500 5.3

0.300 1.1 1.600 2.5 4.000 3.9 8.000 5.5

0.400 1.2 1.800 2.6 4.500 4.1 8.500 5.7

0.500 1.4 2.000 2.7 5.000 4.3 9.000 5.8

0.600 1.5 2.200 2.9 5.500 4.5 9.500 6.0

0.800 1.7 2.400 3.0 6.000 4.7

1.000 1.9 2.600 3.1 6.500 4.9



SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 06/01/2011 12:49

File 101116-0978-Recyc...

Micro Drainage


Checked By


Page 4



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Summer 0.228 0.228 3.5 0.0 3.5 79.7 O K

30 min Summer 0.275 0.275 3.5 0.0 3.5 96.4 O K

60 min Summer 0.329 0.329 3.5 0.0 3.5 115.2 O K

120 min Summer 0.386 0.386 3.5 0.0 3.5 135.1 O K

180 min Summer 0.416 0.416 3.5 0.0 3.5 145.7 O K

240 min Summer 0.434 0.434 3.5 0.0 3.5 152.0 O K

360 min Summer 0.451 0.451 3.5 0.0 3.5 157.9 O K

480 min Summer 0.459 0.459 3.5 0.0 3.5 160.7 O K

600 min Summer 0.463 0.463 3.5 0.0 3.5 162.2 O K

720 min Summer 0.465 0.465 3.5 0.0 3.5 162.7 O K

960 min Summer 0.453 0.453 3.5 0.0 3.5 158.5 O K

1440 min Summer 0.423 0.423 3.5 0.0 3.5 148.1 O K

2160 min Summer 0.376 0.376 3.5 0.0 3.5 131.5 O K

2880 min Summer 0.329 0.329 3.5 0.0 3.5 115.1 O K

4320 min Summer 0.265 0.265 3.5 0.0 3.5 92.6 O K

5760 min Summer 0.200 0.200 3.5 0.0 3.5 69.9 O K

7200 min Summer 0.163 0.163 3.5 0.0 3.5 56.9 O K

8640 min Summer 0.143 0.143 3.4 0.0 3.4 50.0 O K

10080 min Summer 0.130 0.130 3.2 0.0 3.2 45.4 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Summer 104.130 0.0 19

30 min Summer 63.691 0.0 33

60 min Summer 38.957 0.0 62

120 min Summer 23.828 0.0 122

180 min Summer 17.873 0.0 182

240 min Summer 14.574 0.0 240

360 min Summer 10.932 0.0 344

480 min Summer 8.914 0.0 400

600 min Summer 7.610 0.0 464

720 min Summer 6.687 0.0 528

960 min Summer 5.353 0.0 664

1440 min Summer 3.912 0.0 938

2160 min Summer 2.859 0.0 1360

2880 min Summer 2.289 0.0 1756

4320 min Summer 1.761 0.0 2512

5760 min Summer 1.462 0.0 3176

7200 min Summer 1.265 0.0 3816

8640 min Summer 1.124 0.0 4496

10080 min Summer 1.018 0.0 5152

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:25

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 1



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Winter 0.256 0.256 3.5 0.0 3.5 89.5 O K

30 min Winter 0.309 0.309 3.5 0.0 3.5 108.3 O K

60 min Winter 0.370 0.370 3.5 0.0 3.5 129.6 O K

120 min Winter 0.435 0.435 3.5 0.0 3.5 152.2 O K

180 min Winter 0.470 0.470 3.5 0.0 3.5 164.6 O K

240 min Winter 0.492 0.492 3.5 0.0 3.5 172.3 O K

360 min Winter 0.515 0.515 3.5 0.0 3.5 180.3 O K

480 min Winter 0.523 0.523 3.5 0.0 3.5 183.0 O K

600 min Winter 0.525 0.525 3.5 0.0 3.5 183.8 O K

720 min Winter 0.526 0.526 3.5 0.0 3.5 184.1 O K

960 min Winter 0.508 0.508 3.5 0.0 3.5 177.9 O K

1440 min Winter 0.464 0.464 3.5 0.0 3.5 162.3 O K

2160 min Winter 0.392 0.392 3.5 0.0 3.5 137.0 O K

2880 min Winter 0.317 0.317 3.5 0.0 3.5 110.9 O K

4320 min Winter 0.193 0.193 3.5 0.0 3.5 67.5 O K

5760 min Winter 0.142 0.142 3.4 0.0 3.4 49.6 O K

7200 min Winter 0.122 0.122 3.0 0.0 3.0 42.7 O K

8640 min Winter 0.111 0.111 2.7 0.0 2.7 38.8 O K

10080 min Winter 0.103 0.103 2.5 0.0 2.5 36.0 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Winter 104.130 0.0 19

30 min Winter 63.691 0.0 33

60 min Winter 38.957 0.0 62

120 min Winter 23.828 0.0 120

180 min Winter 17.873 0.0 178

240 min Winter 14.574 0.0 234

360 min Winter 10.932 0.0 346

480 min Winter 8.914 0.0 448

600 min Winter 7.610 0.0 484

720 min Winter 6.687 0.0 558

960 min Winter 5.353 0.0 714

1440 min Winter 3.912 0.0 1022

2160 min Winter 2.859 0.0 1468

2880 min Winter 2.289 0.0 1876

4320 min Winter 1.761 0.0 2548

5760 min Winter 1.462 0.0 3112

7200 min Winter 1.265 0.0 3752

8640 min Winter 1.124 0.0 4496

10080 min Winter 1.018 0.0 5240

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:25

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 2


Rainfall Details






D2 (1km) 0.308 Cv (Summer) 0.750

Time / Area Diagram


Time

(mins)

Area

(ha)

0-4 0.419

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:25

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 3


Model Details





0.000 350.0 1.000 350.0





0.100 2.4 1.200 5.3 3.000 8.4 7.000 12.9

0.200 3.3 1.400 5.8 3.500 9.1 7.500 13.3

0.300 2.9 1.600 6.1 4.000 9.7 8.000 13.7

0.400 3.1 1.800 6.5 4.500 10.3 8.500 14.2

0.500 3.4 2.000 6.9 5.000 10.9 9.000 14.6

0.600 3.8 2.200 7.2 5.500 11.4 9.500 15.0

0.800 4.3 2.400 7.5 6.000 11.9

1.000 4.9 2.600 7.8 6.500 12.4



SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:25

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 4



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Summer 0.346 0.346 5.4 0.0 5.4 120.9 O K

30 min Summer 0.409 0.409 5.4 0.0 5.4 143.0 O K

60 min Summer 0.476 0.476 5.4 0.0 5.4 166.7 O K

120 min Summer 0.541 0.541 5.4 0.0 5.4 189.4 O K

180 min Summer 0.571 0.571 5.4 0.0 5.4 199.9 O K

240 min Summer 0.585 0.585 5.4 0.0 5.4 204.9 O K

360 min Summer 0.594 0.594 5.4 0.0 5.4 207.8 O K

480 min Summer 0.596 0.596 5.4 0.0 5.4 208.4 O K

600 min Summer 0.593 0.593 5.4 0.0 5.4 207.6 O K

720 min Summer 0.588 0.588 5.4 0.0 5.4 205.9 O K

960 min Summer 0.560 0.560 5.4 0.0 5.4 196.1 O K

1440 min Summer 0.504 0.504 5.4 0.0 5.4 176.2 O K

2160 min Summer 0.423 0.423 5.4 0.0 5.4 148.2 O K

2880 min Summer 0.346 0.346 5.4 0.0 5.4 121.1 O K

4320 min Summer 0.236 0.236 5.4 0.0 5.4 82.7 O K

5760 min Summer 0.181 0.181 5.3 0.0 5.3 63.5 O K

7200 min Summer 0.157 0.157 5.0 0.0 5.0 54.8 O K

8640 min Summer 0.142 0.142 4.6 0.0 4.6 49.6 O K

10080 min Summer 0.132 0.132 4.2 0.0 4.2 46.1 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Summer 158.066 0.0 19

30 min Summer 94.745 0.0 33

60 min Summer 56.790 0.0 62

120 min Summer 34.040 0.0 122

180 min Summer 25.233 0.0 182

240 min Summer 20.404 0.0 240

360 min Summer 15.125 0.0 308

480 min Summer 12.230 0.0 372

600 min Summer 10.372 0.0 436

720 min Summer 9.066 0.0 506

960 min Summer 7.197 0.0 644

1440 min Summer 5.198 0.0 922

2160 min Summer 3.755 0.0 1320

2880 min Summer 2.981 0.0 1704

4320 min Summer 2.266 0.0 2380

5760 min Summer 1.865 0.0 3008

7200 min Summer 1.604 0.0 3744

8640 min Summer 1.418 0.0 4416

10080 min Summer 1.277 0.0 5144

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:20

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 1



Storm

Event

Max

Level

(m)

Max

Depth

(m)

Max

Control

(l/s)

Max

Overflow

(l/s)

Max

Σ Outflow

(l/s)

Max

Volume

(m³)

Status

15 min Winter 0.388 0.388 5.4 0.0 5.4 135.7 O K

30 min Winter 0.459 0.459 5.4 0.0 5.4 160.6 O K

60 min Winter 0.535 0.535 5.4 0.0 5.4 187.4 O K

120 min Winter 0.611 0.611 5.4 0.0 5.4 213.7 O K

180 min Winter 0.647 0.647 5.5 0.0 5.5 226.5 O K

240 min Winter 0.666 0.666 5.6 0.0 5.6 233.2 O K

360 min Winter 0.678 0.678 5.7 0.0 5.7 237.4 O K

480 min Winter 0.676 0.676 5.7 0.0 5.7 236.5 O K

600 min Winter 0.672 0.672 5.6 0.0 5.6 235.1 O K

720 min Winter 0.663 0.663 5.6 0.0 5.6 232.1 O K

960 min Winter 0.623 0.623 5.4 0.0 5.4 218.2 O K

1440 min Winter 0.541 0.541 5.4 0.0 5.4 189.2 O K

2160 min Winter 0.420 0.420 5.4 0.0 5.4 146.9 O K

2880 min Winter 0.286 0.286 5.4 0.0 5.4 100.0 O K

4320 min Winter 0.169 0.169 5.2 0.0 5.2 59.2 O K

5760 min Winter 0.139 0.139 4.5 0.0 4.5 48.8 O K

7200 min Winter 0.124 0.124 3.9 0.0 3.9 43.4 O K

8640 min Winter 0.114 0.114 3.5 0.0 3.5 39.8 O K

10080 min Winter 0.106 0.106 3.1 0.0 3.1 37.3 O K

Storm

Event

Rain

(mm/hr)

Overflow

Volume

(m³)

Time-Peak

(mins)

15 min Winter 158.066 0.0 19

30 min Winter 94.745 0.0 33

60 min Winter 56.790 0.0 62

120 min Winter 34.040 0.0 120

180 min Winter 25.233 0.0 176

240 min Winter 20.404 0.0 232

360 min Winter 15.125 0.0 340

480 min Winter 12.230 0.0 388

600 min Winter 10.372 0.0 464

720 min Winter 9.066 0.0 542

960 min Winter 7.197 0.0 694

1440 min Winter 5.198 0.0 996

2160 min Winter 3.755 0.0 1428

2880 min Winter 2.981 0.0 1788

4320 min Winter 2.266 0.0 2336

5760 min Winter 1.865 0.0 3008

7200 min Winter 1.604 0.0 3728

8640 min Winter 1.418 0.0 4416

10080 min Winter 1.277 0.0 5144

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:20

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 2


Rainfall Details






D2 (1km) 0.308 Cv (Summer) 0.750

Time / Area Diagram


Time

(mins)

Area

(ha)

0-4 0.419

SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:20

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 3


Model Details





0.000 350.0 1.000 350.0





0.100 2.8 1.200 7.5 3.000 11.9 7.000 18.2

0.200 5.4 1.400 8.1 3.500 12.9 7.500 18.8

0.300 4.6 1.600 8.7 4.000 13.7 8.000 19.4

0.400 4.5 1.800 9.2 4.500 14.6 8.500 20.0

0.500 4.9 2.000 9.7 5.000 15.4 9.000 20.6

0.600 5.3 2.200 10.2 5.500 16.1 9.500 21.2

0.800 6.1 2.400 10.6 6.000 16.8

1.000 6.9 2.600 11.1 6.500 17.5



SLR Consulting Ltd

1 Meadowbank Way

Eastwood

Nottingham

Date 14/12/2010 17:20

File 101116-0978-RECYC...

Micro Drainage


Checked By


Page 4


SLR

Appendix B Envirocheck Report Site Sensitivity Map Section A13 (1:2500)

Order Details

Site DetailsSite at 558000, 106500

Order Number:Customer Ref:National Grid Reference:Slice:Site Area (Ha):Plot Buffer (m):

32914666_1_1416.00978.00005558260, 106980A0.54250

Tel:Fax:Web:

0844 844 99520844 844 9951www.envirocheck.co.uk

Page 1 of 1A Landmark Information Group Service v42.0 26-Oct-2010

Site Sensitivity Map - Segment A13

polegate yard, east sussex slr ref: 416.0978.00005 january 2011 · 2014. 6. 5. · haulaway ltd 1...

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