Site 7C, Edgar Mobbs Way, Northampton Flood Risk & Drainage Statement Document Ref: EMW-BWB-HDG-XX-RP-D-003-S1-P2 Site 7C is a forthcoming development for Brackley Developments Ltd, located on Edgar Mobbs Way in Northampton. This document has been prepared to support a Reserved Matters application for four commercial units, as illustrated on Stephen George & Partners drawing Waste Transfer Facility Site Layout 14-137-C001. The development area is approximately 1.1 hectares. 1. For the original drainage strategy approved under the Outline Planning permission, please refer to the Nolan Associates drainage strategy document, dated December 2015, as contained in the Planning application - N/2016/0015. 2. Floodplain mapping obtained from the Environment Agency website indicates that most of the site is in Flood Zone 1, but with a small encroachment of Flood Zone 2 on the eastern site boundary. See Figure 1 below. Figure 1 – EA Floodplain Mapping Source: https://flood-map-for-planning.service.gov.uk on 5 th July 2017 3. As set out in the approved Outline Planning drainage statement prepared by Nolan Associates, flood water levels surrounding the site were obtained from the Environment Agency, and it was concluded that no building floor level should be lower than 61.42m AOD (which is 300mm higher than the 1 in 1000 flood plain level). The lowest building level for the proposed development at Site 7C is 62.825m AOD. Therefore the proposed development is sufficiently protected from flooding of the surrounding area. 4. The originally submitted outline planning proposal indicated surface water discharge to the River Nene, however this was before Site 7C had been split into separate parcels. The discharge route would now require access across third party land. Due to this, BWB met with Tony Heath and Andrew Buckley of Anglian Water on 7 th June 2017, where an agreement in- principle was reached to discharge surface water runoff from the site to what at the time was the final section of a highway drain network, which then connected to the Anglian Water public sewer. Anglian Water have since agreed to a Section 102 Agreement with the sewer being adopted by Anglian Water on 3 rd January 2018.
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Site 7C, Edgar Mobbs Way, Northampton
Flood Risk & Drainage Statement
Document Ref: EMW-BWB-HDG-XX-RP-D-003-S1-P2
Site 7C is a forthcoming development for Brackley Developments Ltd, located on Edgar Mobbs
Way in Northampton. This document has been prepared to support a Reserved Matters
application for four commercial units, as illustrated on Stephen George & Partners drawing
Waste Transfer Facility Site Layout 14-137-C001. The development area is approximately 1.1
hectares.
1. For the original drainage strategy approved under the Outline Planning permission, please
refer to the Nolan Associates drainage strategy document, dated December 2015, as
contained in the Planning application - N/2016/0015.
2. Floodplain mapping obtained from the Environment Agency website indicates that most of
the site is in Flood Zone 1, but with a small encroachment of Flood Zone 2 on the eastern site
boundary. See Figure 1 below.
Figure 1 – EA Floodplain Mapping Source: https://flood-map-for-planning.service.gov.uk on 5th July 2017
3. As set out in the approved Outline Planning drainage statement prepared by Nolan
Associates, flood water levels surrounding the site were obtained from the Environment
Agency, and it was concluded that no building floor level should be lower than 61.42m AOD
(which is 300mm higher than the 1 in 1000 flood plain level). The lowest building level for the
proposed development at Site 7C is 62.825m AOD. Therefore the proposed development is
sufficiently protected from flooding of the surrounding area.
4. The originally submitted outline planning proposal indicated surface water discharge to the
River Nene, however this was before Site 7C had been split into separate parcels. The
discharge route would now require access across third party land. Due to this, BWB met with
Tony Heath and Andrew Buckley of Anglian Water on 7th June 2017, where an agreement in-
principle was reached to discharge surface water runoff from the site to what at the time was
the final section of a highway drain network, which then connected to the Anglian Water
public sewer. Anglian Water have since agreed to a Section 102 Agreement with the sewer
being adopted by Anglian Water on 3rd January 2018.
1. Do not scale this drawing. All dimensions must be checked/ verified
on site. If in doubt ask.
2. This drawing is to be read in conjunction with all relevant architects,
engineers and specialists drawings and specifications.
3. All dimensions in millimetres unless noted otherwise. All levels in
metres unless noted otherwise.
4. Any discrepancies noted on site are to be reported to the engineer
immediately.
AP
PR
OX
Drainage Notes
1. All adoptable surface and foul water drainage works to be carried
out in strict accordance with 'Sewers for Adoption 7th edition' and
any specific requirements of the adopting authority.
2. All adoptable highway drainage works to be carried out in strict
accordance with the Local Highway Authority requirements and the
DfT MCHW specification for highway works.
3. All private drainage works are to be carried out in accordance with
Building Regulations Part H, BS EN 752, the Civil Engineering
Specification for the Water Industry and, where provided, the BWB
Drainage Specification.
4. Where applicable the contractor shall allow free and full access to
the drainage works for the local authority, highway authority,
drainage authority or the overseeing organisation.
5. The exact position, level, line, size and use of existing drainage is to
be confirmed on site. Any discrepancies to be reported to the
engineer prior to the commencement of works.
6. For new connections to existing manholes, existing benching is to be
broken out and reformed to suit. Concrete/brick surround to be made
good.
7. All temporary works associated with the construction of the drainage
works shall be the responsibility of the contractor, including the
protection of any uncovered/shallow pipework against construction
traffic.
8. The Contractor is responsible for obtaining and paying for all
necessary permissions to enable construction of the works to be
undertaken, including but not limited to licences for street works and
connections to existing sewers. This includes Section 106
applications when connecting directly or indirectly to the public
sewerage network (complete application to be made at least 3
weeks prior to the planned outfall construction works).
9. Any damage caused to existing footways, roads or other third party
property to be made good.
10. Under roads and external paved areas all materials within 450mm of
finished levels to be non-frost susceptable. Reinstatements shall be
undertaken in accordance with the BWB standard detail.
11. All proposed chamber covers are to be marked permanently with
“SWS” (or equiv.) on surface water sewers and “FWS” (or equiv.) on
foul sewers. all covers to be in accordance with BS EN 124.
12. Unless noted otherwise, all lateral connections are to be installed
with level soffits to the diameters and gradients shown on the layout
drawing. Any pipe bends should be provided to suit the direction of
flow & no pipework should be downsized in the direction of flow.
13. The number and location of all RWPs is shown indicatively only. To
be confirmed by Architect / M&E contractor prior to commencement
of works.
14. Foul water 'pop up positions' are shown indicatively only, to be
confirmed by the Architect / M&E contractor prior to commencement
of works. Refer to Architect plans for setting out of internal foul pop
up positions.
15. All RWPs and SVPs to be fitted with rodable access plates. All foul
drains to have rodable access.
16. Above ground drainage details to be designed/confirmed by the
Architect/M&E contractor, including ventilation of the foul drainage
system.
17. Proposed drainage passing through new foundations to be sleeved
with cast-in oversized pipework.
18. All specialist/proprietary products such as separators, attenuation
tanks, channel drains, soakaways, package pumping station and
water treatment units to be installed as per the manufacturer's
installation details and specifications.
S12
Contractor to review and action
the project CDM Risk Register
and the Remediation Strategy,
with specific reference to
ground related risks.
Caution
C1
P1 16.10.18 Updated to Waste Transfer Facility site plan RDSMC
AutoCAD SHX Text
61.42
AutoCAD SHX Text
MO
AutoCAD SHX Text
5000
AutoCAD SHX Text
EB
AutoCAD SHX Text
EB
AutoCAD SHX Text
P
AutoCAD SHX Text
60.41
AutoCAD SHX Text
2
AutoCAD SHX Text
I/R Ht=1.3m
Appendix B
Microdrainage WinDES Calculations
BWB Consulting Ltd Page 15th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
STORM SEWER DESIGN by the Modified Rational Method
BWB Consulting Ltd Page 25th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
BWB Consulting Ltd Page 35th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
S1.000 o 150 S05 62.600 61.735 0.715 Open Manhole 1200S1.001 o 150 S04A 62.600 61.351 1.099 Open Manhole 1200S1.002 o 150 S04 62.790 60.977 1.663 Open Manhole 1200S1.003 o 150 S03 62.785 60.859 1.776 Open Manhole 1200
S2.000 o 150 S01 62.935 61.585 1.200 Open Manhole 1200S2.001 o 150 S6 62.935 61.187 1.598 Open Manhole 1200
S1.004 o 225 S02 62.840 60.697 1.918 Open Manhole 1200S1.005 o 225 S6 62.725 60.637 1.863 Open Manhole 1200
S3.000 o 150 S09 61.900 60.625 1.125 Open Manhole 1200
S4.000 o 225 SACO 61.990 60.700 1.065 Open Manhole 1200S4.001 o 225 S10 62.235 60.657 1.353 Open Manhole 1200
S3.001 o 225 S08 62.235 60.408 1.602 Open Manhole 1200
S1.006 o 300 S7 62.900 60.332 2.268 Open Manhole 1200
S5.000 o 225 SACO 62.680 61.225 1.230 Open Manhole 1200S5.001 o 225 S12 62.740 61.151 1.364 Open Manhole 1200
S1.007 o 375 S11 62.575 60.129 2.071 Open Manhole 1350S1.008 o 375 S12 Attenuation 62.470 60.102 1.993 Open Manhole 1350
Downstream Manhole
PN Length(m)
Slope(1:X)
MHName
C.Level(m)
I.Level(m)
D.Depth(m)
MHConnection
MH DIAM., L*W(mm)
S1.000 36.462 150.0 S04A 62.600 61.492 0.958 Open Manhole 1200S1.001 28.002 150.0 S04 62.790 61.164 1.476 Open Manhole 1200S1.002 17.679 149.8 S03 62.785 60.859 1.776 Open Manhole 1200S1.003 12.992 149.3 S02 62.840 60.772 1.918 Open Manhole 1200
S2.000 29.816 149.8 S6 62.935 61.386 1.399 Open Manhole 1200S2.001 29.816 149.8 S02 62.840 60.988 1.702 Open Manhole 1200
S1.004 9.974 166.2 S6 62.725 60.637 1.863 Open Manhole 1200S1.005 13.774 167.0 S7 62.900 60.555 2.120 Open Manhole 1200
S3.000 32.541 150.0 S08 62.235 60.408 1.677 Open Manhole 1200
S4.000 7.185 167.1 S10 62.235 60.657 1.353 Open Manhole 1200S4.001 14.021 167.0 S08 62.235 60.573 1.437 Open Manhole 1200
S3.001 12.739 167.6 S7 62.900 60.332 2.343 Open Manhole 1200
S1.006 15.351 300.0 S11 62.575 60.281 1.994 Open Manhole 1350
S5.000 12.299 167.0 S12 62.740 61.151 1.364 Open Manhole 1200S5.001 33.060 167.0 S11 62.575 60.953 1.397 Open Manhole 1350
S1.007 8.051 300.0 S12 Attenuation 62.470 60.102 1.993 Open Manhole 1350S1.008 10.851 301.4 S13 Flow Control 62.000 60.066 1.559 Open Manhole 1350
BWB Consulting Ltd Page 45th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
S1.009 o 150 S13 Flow Control 62.000 60.003 1.847 Open Manhole 1350S1.010 o 150 S14 61.950 59.950 1.850 Open Manhole 1200
Downstream Manhole
PN Length(m)
Slope(1:X)
MHName
C.Level(m)
I.Level(m)
D.Depth(m)
MHConnection
MH DIAM., L*W(mm)
S1.009 7.475 149.5 S14 61.950 59.953 1.847 Open Manhole 1200S1.010 27.994 149.7 S 60.560 59.763 0.647 Open Manhole 0
BWB Consulting Ltd Page 55th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
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 3 Number of Real Time Controls 0
Synthetic Rainfall Details
Rainfall Model FSR Profile Type SummerReturn Period (years) 200 Cv (Summer) 0.750
Region England and Wales Cv (Winter) 0.840M5-60 (mm) 20.800 Storm Duration (mins) 30
Ratio R 0.450
BWB Consulting Ltd Page 65th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
Control Points Head (m) Flow (l/s) Control Points Head (m) Flow (l/s)
Design Point (Calculated) 2.000 5.0 Kick-Flo® 0.816 3.3Flush-Flo™ 0.398 4.1 Mean Flow over Head Range - 3.9
The hydrological calculations have been based on the Head/Discharge relationship for the Hydro-Brake®Optimum as specified. Should another type of control device other than a Hydro-Brake Optimum® beutilised then these storage routing calculations will be invalidated
BWB Consulting Ltd Page 75th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
BWB Consulting Ltd Page 85th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
100 year Return Period Summary of Critical Results by Maximum Level (Rank 1) for Storm
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 3 Number of Real Time Controls 0
Synthetic Rainfall DetailsRainfall Model FEH D3 (1km) 0.268
FEH Rainfall Version 1999 E (1km) 0.306Site Location GB 473950 260050 SP 73950 60050 F (1km) 2.527
BWB Consulting Ltd Page 95th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
100 year Return Period Summary of Critical Results by Maximum Level (Rank 1) for Storm
BWB Consulting Ltd Page 105th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
200 year Return Period Summary of Critical Results by Maximum Level (Rank 1) for Storm
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 3 Number of Real Time Controls 0
Synthetic Rainfall DetailsRainfall Model FEH D3 (1km) 0.268
FEH Rainfall Version 1999 E (1km) 0.306Site Location GB 473950 260050 SP 73950 60050 F (1km) 2.527
BWB Consulting Ltd Page 115th Floor, Waterfront House Edgar Mobbs Way35 Station StreetNottingham, NG2 3DQDate 17/10/2018 13:12 Designed by david.grayFile EDGAR MOBBS FEH 16.10.18.MDX Checked byXP Solutions Network 2017.1.2
200 year Return Period Summary of Critical Results by Maximum Level (Rank 1) for Storm