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WHINBERRY VIEW
RAWTENSTALL
FLOOD RISK ASSESSMENT
For BE Boys Todd Carr Road Waterfoot Rossendale Lancashire BB4 9SJ
October 2014
Whinberry View, Rawtenstall Flood Risk Assessment
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WHINBERRY VIEW RAWTENSTALL
FLOOD RISK ASSESSMENT
Document Tracking Sheet Document Reference: FRA237
Revision: 2.3
Date of revision: October 2014
Report status: Final
Prepared by: ____________________________________ Christopher Pickles
Engineering Technician
Checked by: ____________________________________ Richard Nicholas BEng (Hons) MBA Associate
Authorised by: ____________________________________
Robert Ankers Director
Revision History: Rev.: Date: Status: Prepared by: Checked by: Issued by: 2.3 24 October 2014 Final CP RDN CP 2.2 14 July 2014 Final CP MDP CP 2.1 10 July 2014 Final CP MDP CP 2.0 08 November 2013 Final RDN MDP RDN 1.0 24 October 2013 Draft CP/RDN JC RDN
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EXECUTIVE SUMMARY This Flood Risk Assessment was commissioned by BE Boys, referred to hereafter as ‘the client’. This Flood Risk Assessment has been prepared to support the detailed planning application for the construction of 29no. residential dwellings complete with access, external works, footpaths, car parking, external lighting, landscaping, boundary walls, fencing, external services and drainage; in addition this report satisfies the mandatory requirements of the Code for Sustainable Homes.
The Environment Agency’s flood mapping data identifies that the site is located within Flood Zone 1. The residential nature of the development proposals means the classification of the site is ‘more vulnerable’ from the NPPF Table 2 and this is considered an appropriate development type within Flood Zone 1. The Flood Risk Assessment has reviewed all sources of flood risk to both the proposed development and to the existing adjacent development as a result of the proposals, including; fluvial, tidal, pluvial, groundwater, sewers and flooding from artificial sources. The development is accessible for emergency access and egress during times of extreme flooding as the 100 year floodplain does not extend into the proposed development area. In light of the relatively low flood risk from all of the sources reviewed the principle focus of the Flood Risk Assessment is on the effective management of surface water drainage. Based on the ground conditions identified, it can be considered that infiltration drainage is unlikely to be able to provide a suitable means of surface water disposal for the flows generated by the proposed development. At present it is understood that the site positively drained to the public sewer network and it is proposed that this continue; but at a reduced rate of discharge mimicking the pre‐development rates. The maximum allowable rate of discharge and the drainage strategy has been agreed with United Utilities. This report has been prepared in consultation with the relevant interested parties and incorporates their comments where possible. The Flood Risk Assessment is considered to be commensurate with the development proposals and in summary, the development can be considered appropriate in accordance with the NPPF.
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CONTENTS Document Tracking Sheet .............................................................................................................. iii
EXECUTIVE SUMMARY ................................................................................................................. v
Figures & Tables .............................................................................................................................. 7 Specialist Software .......................................................................................................................... 7 Abbreviations & Acronyms ............................................................................................................... 7
1.0 INTRODUCTION .................................................................................................................. 8
1.1 Planning Policy Context ....................................................................................................... 8 1.2 Site Context .......................................................................................................................... 8 1.3 Consultation ......................................................................................................................... 8
2.0 EXISTING SITE SITUATION ............................................................................................... 9
2.1 Location ................................................................................................................................ 9 2.2 Existing and Historical Land Use ......................................................................................... 9 2.3 Topographical Survey .......................................................................................................... 9
3.0 DEVELOPMENT PROPOSALS ......................................................................................... 10
3.1 Nature of the development ................................................................................................. 10
4.0 SOURCES OF FLOOD RISK ............................................................................................. 11
4.1 Fluvial Flood Risk ............................................................................................................... 11 4.2 Tidal Flood Risk ................................................................................................................. 11 4.3 Artificial Sources of Flood Risk .......................................................................................... 12 4.4 Pluvial Flood Risk ............................................................................................................... 12 4.5 Groundwater Flood Risk .................................................................................................... 13 4.6 Sewer Flood Risk ............................................................................................................... 13 4.7 Strategic Flood Risk Assessment (SFRA) Information....................................................... 13 4.8 Historical and Anecdotal Flooding Information ................................................................... 13 4.9 Flood Risk Vulnerability Classification and Flood Zone Compatibility ................................ 14 4.10 Mitigation Measures ........................................................................................................... 14 4.11 Residual Risks ................................................................................................................... 14
5.0 SURFACE WATER MANAGEMENT ................................................................................. 15
5.1 Pre-development Surface Water Run-off ........................................................................... 15 5.2 Post-development Surface Water Run-off ......................................................................... 15 5.3 Sustainable Drainage Systems (SuDS) ............................................................................. 15 5.4 Methods of Surface Water Management ........................................................................... 16 5.5 Discharge via Infiltration ..................................................................................................... 16 5.6 Discharge to Watercourse .................................................................................................. 17 5.7 Discharge to Sewer ............................................................................................................ 17 5.8 Climate Change ................................................................................................................. 17
6.0 FOUL WATER MANAGEMENT ......................................................................................... 19
7.0 SUMMARY AND CONCLUSIONS ..................................................................................... 20
8.0 RECOMMENDATIONS ...................................................................................................... 21
BIBLIOGRAPHY & REFERENCES ............................................................................................... 22
APPENDIX A: LOCATION PLAN ........................................................................................... 23
APPENDIX B: TOPOGRAPHIC SURVEY ............................................................................. 25
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APPENDIX C: PROPOSED PLANNING LAYOUT ................................................................ 27
APPENDIX D: EA FLOODING INFORMATION & CORRESPONDENCE ............................. 29
APPENDIX E: FEH CATCHMENT DATA & DESCRIPTORS ................................................ 31
APPENDIX F: NPPF TECHNICAL GUIDANCE EXTRACTS................................................. 33
APPENDIX G: WATER COMPANY RECORDS & CORRESPONDENCE ............................ 35
APPENDIX H: LA CORRESPONDENCE .............................................................................. 37
APPENDIX I: SURFACE WATER RUN-OFF CALCULATIONS ........................................... 39
APPENDIX J: IMPERMEABLE AREAS PLANS .................................................................... 41
APPENDIX K: SFRA INFORMATION .................................................................................... 43
APPENDIX L: STORMWATER STORAGE ESTIMATES ...................................................... 45
APPENDIX N: NOTES OF LIMITATION ................................................................................ 47
Figures & Tables
Figure 1: Aerial Photograph of site (Google Earth 2013) .................................................................. 9
Figure 2: Planning Layout Extract (Nicol Thomas 2014) ................................................................. 10
Figure 3: Flood Zone Map Extract (Environment Agency 2013) ...................................................... 11
Figure 4: Reservoir Flood Map Extract (Environment Agency 2013) ............................................... 12
Specialist Software
Flood Estimation Handbook FEH CD‐ROM (v.3.0) – Determination of Catchment Descriptors and depths of rainfall
MicroDrainage WinDES (v.12.6.1) – Calculation of Greenfield run‐off rates IH124/ICP‐SUDS, Greenfield run‐off volumes, rates of rainfall and stormwater storage estimates
Abbreviations & Acronyms
AEP Annual Exceedance Probability mAOD Metres Above Ordnance Datum
BGL Below Ground Level NGR National Grid Reference
BGS British Geological Survey NPPF National Planning Policy Framework
CC Climate Change NSRI National Soils Resources Institute
EA Environment Agency OS Ordnance Survey
FEH Flood Estimation Handbook QSE Quick Storage Estimate
FRA Flood Risk Assessment RBC Rossendale Borough Council
FZ Flood Zone SFRA Strategic Flood Risk Assessment
Ha Hectare SuDS Sustainable Urban Drainage Systems
IDB Internal Drainage Board TWL Top Water Level
LCC Lancashire County Council UKCIP United Kingdom Climate Impacts Programme
LLFA Lead Local Flood Authority UU United Utilities
LPA Local Planning Authority
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1.0 INTRODUCTION
1.1 Planning Policy Context 1.1.1 All forms of flooding and their impact on the natural and built environment are material
planning considerations. The National Planning Policy Framework (NPPF) sets out the Government’s objectives for the planning system, and how planning should facilitate and promote sustainable patterns of development, avoiding flood risk and accommodating the impacts of climate change.
1.1.2 Government policy with respect to development in flood risk areas is contained within the NPPF
and the supporting Technical Guidance. 1.1.3 This Flood Risk Assessment satisfies the mandatory requirements of the Code for Sustainable
Homes.
1.2 Site Context 1.2.1 The Flood Risk Assessment has been prepared for the planning application but will also satisfy
the mandatory requirements of the Code SUR1; for the construction of 29no. residential dwellings complete with access, external works, footpaths, car parking, external lighting, landscaping, boundary walls, fencing, external services and drainage.
1.3 Consultation 1.3.1 The preparation of this report has been undertaken in consultation with the following interested
parties; Rossendale Borough Council (RBC), Lancashire County Council (LCC), the Environment Agency (EA) and United Utilities (UU).
1.3.2 The Local Planning Authority (LPA), Rossendale Borough Council, have been consulted as part of
the preparation of this report; RBC also acts as the Lead Local Flood Authority (LLFA). The NPPF advises that the LPA should consult with the Environment Agency who will provide advice and guidance on flood issues at a strategic level and in relation to planning applications.
1.3.3 The Environment Agency was contacted to discuss the nature and extent of information to be
provided in this Flood Risk Assessment (FRA) and for any background knowledge of flood risk specific to the site (correspondence is included in Appendix D).
1.3.4 United Utilities Developer Services were contacted to discuss whether UU have any historical
flooding issues in the area or any background knowledge on flood risk specific to the site (correspondence is included in Appendix G).
1.3.5 Rossendale Borough Council (RBC) and Lancashire County Council (LCC) were contacted to
discuss the nature and extent of information to be provided in this Flood Risk Assessment (FRA) and for any background knowledge of flood risk specific to the site (correspondence is included in Appendix H).
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2.0 EXISTING SITE SITUATION
2.1 Location 2.1.1 The development is accessed just off Whinberry View, Rawtenstall. The Ordnance Survey
National Grid Reference (OS NGR) for the site is 381966 (Easting), 422719 (Northing) and the nearest postcode is BB4 7PA. The site location plan is shown in Appendix A.
2.1.2 The site is bounded; to the north by undeveloped land, to the east by existing residential
development, to the south by Bacup Road and to the west by Co‐Operation Street with residential dwellings beyond.
2.1.3 The total site area is approximately 0.751ha, the site is considered to be 0.284ha (38%)
impermeable for the purposes of determining the pre‐development surface water run‐off.
Figure 1: Aerial Photograph of site (Google Earth 2013)
Aerial view of the proposed development area
2.2 Existing and Historical Land Use 2.2.1 The site was previously a care home and an aerial photograph is shown above in Figure 1.
2.3 Topographical Survey 2.3.1 The site falls from the northeast to the southwest. A full and detailed topographic survey is
included in appendix B.
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3.0 DEVELOPMENT PROPOSALS
3.1 Nature of the development 3.1.1 The development proposed is for the construction of 29no. residential dwellings complete with
access, external works, footpaths, car parking, external lighting, landscaping, boundary walls, fencing, external services and drainage.
3.1.2 The pertinent planning drawings are included in Appendix C; an extract of the development
proposal is shown in Figure 2 (below). 3.1.3 The total site area is approximately 0.751ha and pre‐development is considered to be 0.284ha
impermeable (38%); the proposed impermeable area of the development is approximately 0.449ha (60%) of the total site area.
Figure 2: Planning Layout Extract (Nicol Thomas 2014)
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4.0 SOURCES OF FLOOD RISK
4.1 Fluvial Flood Risk 4.1.1 Information relating to the flood risk at the site has been obtained from the Environment
Agency’s (EA) website and online Flood Map, an extract of which is shown in Figure 3 (below). 4.1.2 Examination of the Flood Map shows that the site is located within Flood Zone 1; Appendix D
shows the online flood map and statement in full.
Figure 3: Flood Zone Map Extract (Environment Agency 2013) 4.1.3 The EA provided water levels data from the River Irwell & Limy Water study (2011); the adjacent
node (ea0140IRWE_0386u) has modelled top water levels of 170.65mAOD and 172.20mAOD for the 1%AEP (1 in 100 year) and the 0.1%AEP (1 in 1000 year) storm events respectively. Review of the topographic survey shows that even the 0.1%AEP floodplain does not extent into the proposed development area. The lowest proposed Finished Floor level is 172.800mAOD (plots 19 and 20), this is significantly elevated relative to even the 0.1%AEP storm event.
4.2 Tidal Flood Risk 4.2.1 Due to the distance from the coast and estuarine waterways the risk of flooding from tidal
sources is considered low.
Legend; ______ Flood Zone 2 ______ Flood Zone 3
Proposed Development Location
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4.3 Artificial Sources of Flood Risk 4.3.1 The proposed development is indicated to be at flood risk from reservoirs on the EA’s online
Reservoir Flood Map; the extent of the flood risk from reservoirs is indicated by the green shading in Figure 4 (subsequent page).
4.3.2 It should be noted that the risk of catastrophic failure is considered to be very low, as the
reservoirs are such major United Utilities assets it is understood that there are appropriate maintenance regimes and regular reviews undertaken confirming integrity of the embankments.
Figure 4: Reservoir Flood Map Extract (Environment Agency 2013) 4.3.3 There are no canals within the immediate vicinity of the proposed development that present a
flood risk to the site.
4.4 Pluvial Flood Risk 4.4.1 Intense rainfall that is unable to soak into the ground or enter drainage systems can run‐off land
and result in flooding. Local topography and the land use can have a strong influence on the direction and depth of flow. Large catchment areas are particularly prone to this type of flooding. The volume and rate of overland flow from land can be exacerbated if development increases the percentage of impermeable area.
4.4.2 The topography of the development and surrounding area means there is little likelihood of
significant flows impacting on the proposed development or on land and property adjacent to the development. The only flows that are likely to be present on site are from direct rainfall on areas of hardstanding.
Proposed Development Location
Legend; ______ Reservoir Flood Risk
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4.4.3 Any overland flows generated by the proposed development must be carefully controlled; safe
avenues of overland flow away from the existing and proposed buildings are advised.
4.5 Groundwater Flood Risk 4.5.1 In general terms groundwater flooding can occur from three main sources: ‐ raised water tables,
seepage and percolation and groundwater recovery or rebound. 4.5.2 If groundwater levels are naturally close to the surface then this can present a flood risk during
times of intense rainfall. 4.5.3 Seepage and percolation occur where embankments above ground level hold water. In these
cases water travels through the embankment material and emerges on the opposite side of the embankment. At present there are no reported problems with groundwater flooding.
4.5.4 Groundwater recovery / rebound occurs where the water table has been artificially depressed
by abstraction. When the abstraction stops the water table makes a recovery to its original level. There is the potential for groundwater flooding in low lying areas where groundwater levels have been depressed below their pre‐pumping conditions, where these were at or close to ground level. As with the seepage scenario the likelihood of flooding from this source is low.
4.5.5 The EA’s online mapping data indicates that the site is at high groundwater vulnerability from a
minor aquifer. No historical groundwater flooding of the site has been identified during consultation with the various interested parties; however setting Finished Floor Levels a minimum of 150mm above the external levels following any re‐grade should mitigate any risk of flooding from this source.
4.6 Sewer Flood Risk 4.6.1 In urban areas, rainwater is frequently drained into surface water sewers or sewers containing
both surface and waste water known as ‘combined sewers’. Foul water flooding often occurs in areas prone to overland flow and can result when the sewer is overwhelmed by heavy rainfall and will continue until the water drains away. It can also occur when the sewer becomes blocked or is of inadequate capacity, this could lead to there being a high risk of internal property flooding with contaminated water.
4.6.2 Consultation with United Utilities and Lancashire County Council has not highlighted any
historical records of public sewer flooding of properties in the vicinity as a result of overloaded sewers.
4.7 Strategic Flood Risk Assessment (SFRA) Information 4.7.1 The SFRA indicates that the site is within Flood Zone 1; no specific flood risks to the proposed
development area have been identified.
4.8 Historical and Anecdotal Flooding Information 4.8.1 An Internet based search for flooding events did not recall any historical flooding in the
immediate site area.
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4.8.2 Consultation with various interested parties also failed to highlight any historical flooding to the
development area.
4.9 Flood Risk Vulnerability Classification and Flood Zone Compatibility 4.9.1 The development is ‘residential’ in its nature and as such is classified as ‘more vulnerable’ in
Table 1: Flood Risk Vulnerability Classification within the Technical Guidance to the National Planning Policy Framework, Table 2: Flood Risk Vulnerability and Flood Zone ‘Compatibility’ within the NPPF confirms that this type of land use is appropriate for Flood Zone 1.
4.10 Mitigation Measures 4.10.1 No specific flood risk mitigation measures are proposed as the development is located within
Flood Zone 1. 4.10.2 Setting Finished Floor Levels a minimum of 150mm above the external levels following any re‐
grade should mitigate any risk of flooding from a variety of sources. 4.10.3 As with any development it is advised that external levels fall away from property to minimise
the risk of internal flooding from a variety of sources. 4.10.4 As with any development overland flows generated by the proposed development must be
carefully controlled; safe avenues of overland flow away from any existing and proposed buildings are advised.
4.11 Residual Risks 4.11.1 The development is accessible for emergency access and egress during times of extreme
flooding as the 100 year floodplain does not extend into the proposed development. 4.11.2 Any overland flows generated by the proposed development must be carefully controlled; safe
avenues of overland flow away from the existing and proposed dwellings are advised. 4.11.3 As with any drainage system blockages within either the foul or surface water system have the
potential to cause flooding or disruption. It is important that should any drainage systems not be offered for adoption to either the Water Company or the Local Authority then an appropriate maintenance regime be scheduled with an appropriate management company for these private drainage systems.
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5.0 SURFACE WATER MANAGEMENT
5.1 Pre‐development Surface Water Run‐off 5.1.1 For the purposes of determining the existing rate of surface water run‐off the site is considered
to be Brownfield; the total area of the site is 0.751ha (hectares). 5.1.2 The surface water run‐off rates have been calculated using the Modified Rational Method and
rainfall catchment characteristics from the Flood Estimation Handbook (FEH), details of which are included Appendix E.
5.1.3 The existing impermeable area of site generates a peak run‐off rate of 39.4l/s based on an area
of 0.284ha and a rainfall intensity of 50mm/hr. 5.1.4 The approximate surface water run‐off volume generated by the total site area based on the 1 in
100 year return period storm event is 365.8m3; estimated using the FEH rainfall catchment characteristics (6hr duration event).
5.2 Post‐development Surface Water Run‐off 5.2.1 The residential nature of the development proposals means that there will be a slight increase in
the impermeable area of the site from 0.284ha to approximately 0.449ha, resulting in a slight increase in both the volume and the peak rate of surface water run‐off if flows are unrestricted.
5.2.2 The proposed impermeable area will be approximately 0.449ha, approximately 60% of the total
development area. 5.2.3 The approximate surface water run‐off volume generated by the impermeable area that is
positively drained, based on the 1 in 100 year return period storm event with a 30% allowance for climate change is 441.9m3; estimated using the FEH rainfall catchment characteristics (6hr duration event).
5.3 Sustainable Drainage Systems (SuDS) 5.3.1 In accordance with the NPPF, Sustainable Drainage Systems (SuDS) should be specified wherever
possible to manage surface water. This in turn reduces the burden downstream on both watercourses and sewerage systems.
5.3.2 SuDS have the ability to address three core objectives; water quantity, water quality and
amenity value. With the appropriate system specified, all three core objectives can be satisfied. Where possible, peak surface water discharge rates to watercourses and sewers should be reduced.
5.3.3 Preference should always be given to SuDS over the traditional methods of buried sewers
wherever possible and practical. Runoff from car parking areas and roads could be conveyed through swales, permeable pavements, bio‐retention areas and petrol interceptors to provide a degree of treatment before flows are carried to public sewers.
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5.3.4 Opportunities should be taken to provide soft landscaping where at all possible on site to assist in minimising surface water run‐off. Added benefits include biodiversity and visual enhancements.
5.3.5 The exact type of SuDS will be determined at the detailed design stage.
5.4 Methods of Surface Water Management 5.4.1 At present the site is predominantly Brownfield; the total site area is ha and is considered to be
38% impermeable (0.284ha). 5.4.2 The proposed impermeable area of the development is approximately 0.449ha of the total site
area, this equates to 60% of the total site area; of this only 0.255ha (34%) is domestic impermeable area the remainder is highway.
5.4.3 There are three methods that have been reviewed for the management and discharge of surface
water detailed below; these may be applied individually or collectively to form a complete strategy. They should be applied in the order of priority listed below.
Discharge via infiltration
Discharge to watercourse
Discharge to sewerage system
5.5 Discharge via Infiltration 5.5.1 Any impermeable areas that can drain to soakaway or an alternative method of infiltration
would significantly improve the sustainability of any surface water systems. 5.5.2 The British Geology Survey (BGS) mapping data indicates that ground conditions are as follows: ‐
1:50 000 scale bedrock geology description: Pennine Lower Coal Measures Formation ‐ Sandstone. Sedimentary Bedrock formed approximately 312 to 313 million years ago in the Carboniferous Period. Local environment previously dominated by swamps, estuaries and deltas. Setting: swamps, estuaries and deltas. These rocks were formed in marginal coastal plains with lakes and swamps periodically inundated by the sea; or estuaries and deltas, and shallow seas. 1:50 000 scale superficial deposits description: Till, Devensian ‐ Diamicton. Superficial Deposits formed up to 2 million years ago in the Quaternary Period. Local environment previously dominated by ice age conditions. Setting: ice age conditions. These rocks were formed in cold periods with Ice Age glaciers scouring the landscape and depositing moraines of till with outwash sand and gravel deposits from seasonal and post glacial meltwaters.
5.5.3 The National Soil Resources Institute (NSRI) identifies the soils in this location as; slowly permeable, seasonally wet, acid loamy and clayey soils. Drainage is considered to be impeded.
5.5.4 Based on the ground conditions identified, it can be considered that infiltration drainage is
unlikely to provide a suitable means of surface water disposal for the flows generated by the proposed development. If infiltration is to be pursued as a possible method of surface water
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drainage then further investigation is advised, with soakaway testing to BRE365 in specific locations where infiltration may be feasible.
5.6 Discharge to Watercourse 5.6.1 There is no watercourse within close proximity to the development that would provide a
suitable outfall from the proposed development.
5.7 Discharge to Sewer 5.7.1 At present the surface water run‐off generated by the site is understood to discharge to the
adjacent UU public sewer network. A copy of United Utilities sewer records is included in Appendix G.
5.7.2 It is proposed that if infiltration is not viable then discharge of the surface water run‐off
generated by the proposed development should continue to be discharged to the watercourse mimicking the pre‐development rates of run‐off.
5.7.3 As the surface water run‐off is being increased as a result of the introduction of increased
impermeable areas, it is necessary to restrict the post‐development rate of run‐off to the pre‐development greenfield rate of run‐off for all storm events up to and including the 100 year event.
5.7.4 The pre‐development annual peak rate of discharge is calculated to be 14.9l/s using the
Modified Rational method for the impermeable areas (using FEH rainfall characteristics). 5.6.5 The pre‐development 100 year return period peak rate of discharge is calculated to be 39.4l/s
using the Modified Rational method for the impermeable areas (based on 50mm/hr). 5.6.6 United Utilities have agreed the drainage design principles and confirmed that the maximum
allowable rate of surface water discharge is 31.4l/s. 5.6.7 Restricting the rate of surface water discharge can be achieved using a Hydrobrake® or similar
approved product. 5.6.8 Restricting the rate of discharge for the surface water generates a storage requirement during
the extreme rainfall events. For the annual storm event storage requirements are estimated to be between 13 and 32cu.m when restricting flows to 14.9l/s. During the 100 year return period storm event with an allowance of 30% to account for climate change the storage requirements are estimated to be between 140 and 228cu.m when restricting flows to 31.4l/s.
5.6.9 The stormwater storage figures quoted above are estimates only and the detailed drainage
design will determine with accuracy the stormwater storage requirements. This attenuated volume of stormwater could be stored within a pond or within tank sewers (over‐sized pipes).
5.8 Climate Change 5.8.1 There are indications that the climate in the UK is changing significantly and it is widely believed
that the nature of climate change will vary greatly by region. Current expert opinion indicates
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the likelihood that future climate change would produce more frequent short duration and high intensity rainfall events with the addition of more frequent periods of long duration rainfall.
5.8.2 The NPPF Technical Guidance Table 5 states that the recommended national precautionary
sensitivity ranges for increase of peak rainfall intensity is 30% until 2115. It is widely believed that the impact of climate change means there is likely to be a long term increase in the average sea levels, with an expectation that sea levels will rise gradually.
5.8.3 An increase in flood water levels means that future flooding events will occur more frequently and will have a greater impact.
5.8.4 Any increase in the level of flood risk to the proposed development from climate change is likely
to be related to the increase in rainfall intensity and duration and its impact upon the surface water drainage system.
5.8.5 Climate Change should be accounted for within the design and it is recommended that an
increase in peak rainfall intensity of 30% is allowed for.
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6.0 FOUL WATER MANAGEMENT 6.1 At present any foul water flows from the site are understood to discharge to the public sewer
network and it is proposed that this be continued. 6.2 Based on the proposals for the construction of up to 29no. residential apartments the
approximate peak foul water flows generated by the residential development are approximately 1.1l/s. This is based on 4000 litres per dwelling per 24 hours; the guidance contained within Sewers for Adoption (SfA).
6.3 It is proposed that the foul water generated by the development continue to discharge to the
public sewer network, this has been agreed in principle with United Utilities. A copy of the sewer records and correspondence is included in Appendix G.
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7.0 SUMMARY AND CONCLUSIONS 7.1 The Flood Risk Assessment has been prepared for the planning application but will also satisfy
the mandatory requirements of the Code SUR1; for the construction of 29no. residential dwellings complete with access, external works, footpaths, car parking, external lighting, landscaping, boundary walls, fencing, external services and drainage.
7.2 The preparation of this report has been undertaken in consultation with the following interested
parties; Rossendale Borough Council, Lancashire County Council the Environment Agency and United Utilities.
7.3 The residential nature of the development proposals means the classification of the site is ‘more
vulnerable’ from the NPPF Table 2 and this is considered an appropriate development type within Flood Zone 1.
7.4 The Flood Risk Assessment (FRA) has reviewed all sources of flood risk to both the proposed
development and to the existing adjacent development as a result of the proposals, including; fluvial, tidal, pluvial, groundwater, sewers and flooding from artificial sources.
7.5 An Internet based search for flooding events did not recall any historical flooding in the
immediate site area. Consultation with United Utilities, Rossendale Borough Council, Lancashire County Council and the Environment Agency has not highlighted any historical records of flooding in the vicinity of the proposed development.
7.6 As a result of the relatively low flood risk from all of the sources reviewed, the principle focus of
the Flood Risk Assessment is on the effective management of surface water drainage. 7.7 Based on the ground conditions identified, it can be considered that infiltration drainage is
unlikely to be able to provide a suitable means of surface water disposal for the flows generated by the proposed development. It may be possible to use infiltration as a part solution; however soakaway testing to BRE365 in specific locations where this may be practical will be required to determine feasibility.
7.8 At present it is understood that the site positively drained to the public sewer network and it is
proposed that this continue; rates and volume of discharge will be restricted to pre‐development rates and the drainage strategy has been agreed with United Utilities.
7.9 The development is accessible for emergency access and egress during times of extreme
flooding as the 100 year floodplain does not extend into the proposed development area. 7.10 As with any drainage system blockages within either the foul or surface water sewer systems
have the potential to cause flooding or disruption. 7.11 The Flood Risk Assessment is considered to be commensurate with the development proposals
and in summary, the development can be considered appropriate in accordance with the NPPF.
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8.0 RECOMMENDATIONS 8.1 Opportunities should be taken to provide soft landscaping where at all possible on site to assist
in minimising surface water run‐off. Added benefits include biodiversity and visual enhancements.
8.2 Any overland flows generated by the proposed development must be directed away from
residential properties; safe avenues of overland flow are advised. 8.3 It is proposed that surface water flows generated by the development continue to discharge to
the existing public sewer network.
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
BIBLIOGRAPHY & REFERENCES CIRIA 522: Sustainable urban drainage systems – design manual for England and Wales (2000). CIRIA 523: Sustainable urban drainage systems – best practice manual (2001). CIRIA 609: Sustainable drainage systems. Hydraulic, structural and water quality advice (2004). CIRIA 624: Development and flood risk – guidance for the construction industry (2004). CIRIA 635: Designing for exceedance in urban drainage: Good practice (2006). CIRIA 644: Building Greener (2007). CIRIA 697: The SUDS manual (2007). Flood Risk to People – Phase 2 (FD2321/TR2), DEFRA and the Environment Agency (2006). Flood estimation for small catchments: Institute of Hydrology Report No.124, NERC (1994). Flood Estimation Handbook, Centre for Ecology and Hydrology (1999). National Planning Policy Framework (NPPF), CLG (2012). Planning Policy Statement 25: Development and Flood Risk (2006). Sewers for Adoption 7th Edition, WRc (2012). Technical Guidance to the National Planning Policy Framework, CLG (2012).
Web‐based references Bingmaps – http://www.bing.com/Maps/ British Geological Survey – http://www.bgs.ac.uk/opengeoscience/home.html Chronology of British Hydrological Events – www.dundee.ac.uk/ CIRIA – http://www.ciria.org/ Cranfield University – http://www.landis.org.uk/soilscapes/ Environment Agency – www.environment‐agency.gov.uk/ FloodProBE – http://www.floodprobe.eu/ Flood Forum – http://www.floodforum.org.uk/ Flood London – http://www.floodlondon.com/ Flood Resilience Group – http://www.floodresiliencegroup.org/frg/ Google Maps – http://maps.google.co.uk/ London Resilience – http://www.londonprepared.gov.uk/ Shire Group of IDB’s – http://www.shiregroup‐idbs.gov.uk/default.asp Streetmap – http://www.streetmap.co.uk/ US Army Corps of Engineers – http://www.hec.usace.army.mil/software/hec‐ras/ United Utilities – http://www.unitedutilities.com/default.aspx Watertight International – http://www.watertightinternational.com/
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX A: LOCATION PLAN
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LOCATION PLAN
Whinberry View, Rawtenstall
OS X (Eastings) 381966 OS Y (Northings) 422719 Nearest Post Code BB4 7PA Lat (WGS84) N53:42:02 (53.700591) Long (WGS84) W2:16:29 (-2.274633) LR SD819227 mX -253211 mY 7079192
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX B: TOPOGRAPHIC SURVEY
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171.95
171.88
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172.27
172.30
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172.51
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178.86
178.94
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172.15
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172.29
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179.46
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182.08
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184.61
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178.59
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179.76
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185.25
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182.05
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179.10
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180.86
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173.28
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173.29
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173.34
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178.35
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180.98
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173.19
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173.60
173.51
173.38
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183.04
181.60
180.73
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177.02
177.65
179.02
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173.39
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173.36
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173.53
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173.90
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174.72
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174.31
174.62
174.84
176.46
180.07
177.96
177.16
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175.90
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174.27
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175.07
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IL172.00
IL170.75
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IL170.15
IL171.07
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UT
L
Rawtenstall
Whinberry View
A0 13H035/001 A
Sheet Size & Drg Number & Revision
13H035
Sep 13
1:200
Job Number
Scale(s)
Date
Checked
Drawn
Surveyor
Topographical Survey of Land at:
Drawing Title
MG
AC
CW
WSV.........Water Stop Valve (mains)
WST.........Water Stop Tap (domestic)
UTL.........Unable to Lift (MH,IC etc)
TP..........Telecommunications Pole
TLB.........Traffic Light Control Box
TIE.........Anchor Point (Masts/Poles)
HV..........High Voltage
Ht..........Height
I/R.........Iron Railing
EL SUB STN..Electricity Sub Station
ETL.........Electricity Transmission Line
FH..........Fire Hydrant
FL..........Floor Level
FP..........Flagpole
G*.*........Girth (of tree)
G...........Gulley
GP..........Guide Post
GSV.........Gas Stop Valve
HSE.........Housing
EL..........Eaves Level
ELB.........Electricity Box
EP..........Electricity Pole
ER..........Earth Rod
F/B.........Flower Bed
FFL.........Finished Floor Level
U/C.........Under Construction
WO..........Wash Out
WM..........Water Meter
WL..........Water Level
W/M.........Wire Mesh
VP..........Vent Pipe
VDP.........Vehicle Detector Pad
U/G.........Underground
TPIT........Trial Pit
TMC.........Tarmac
TM..........Ticket Machine
TL..........Traffic Light
TFR.........Taken From Records
STANDARD REFERENCE & ABBREVIATIONS
TBM.........Temporary Bench Mark
SV..........Stop Valve (unspecified)
OSBM........Ordnance Survey Bench Mark
B/W.........Barbed Wire
KO..........Kerb Outlet
EIC.........Electricity Inspection Cover
Cul.........Culvert
D.C.........Drainage Channel
DP..........Down Pipe
DR..........Drain
ECP.........Electricity Cable Pit
EJ..........Expansion Joint
EJB.........Electricity Junction Box
CL..........Cover Level
CM..........Cable Marker
COL.........Column
CONC........Concrete
CP..........Catch Pit
CTV.........Cable Television
CW..........Concrete Block Wall
Chy.........Chimney
SVP.........Soil Vent Pipe
TCB.........Telephone Call Box
TB..........Traffic Bollard
SoL.........Soffit Level
SW..........Stone Wall
SP..........Sign Post
SL..........Sump Level
SAP.........Sapling
RWP.........Rain Water Pipe
RTW.........Retaining Wall
RS..........Road Sign
RE..........Rodding Eye
PT..........Post or Pillar
PP..........Petrol Pump
Bar.........Barrier
Bol.........Bollard
C/B.........Close Boarded
C/I.........Corrugated Iron
C/P.........Chestnut Paling
CB..........Control Box
CCTV........Closed Circuit TV
CD..........Cable Duct
CH/L........Chain Link
BB..........Belisha Beacon
BH..........Borehole
BL..........Bed Level
BS..........Bus Stop
BT Box......British Telecom Box
BT..........British Telecom IC
BW..........Brick Wall
O/H.........Overhead
PB..........Pillar Box
PC..........Pedestrian Crossing
PAV.........Paving
P/W.........Post & Wire
P/R.........Post & Rail
P/C.........Post & Chain
O/P.........Open Paling
NP..........Street Name Plate
MP,MS.......Mile Post or Stone
MKR.........Marker
MH..........Manhole
MG..........Multi-Girth
LP..........Lamp Post
LB..........Letter Box
(AR)........Assumed Route
AV..........Air Valve
IL..........Invert Level
IC..........Inspection Cover
with local authority records before use
Drainage information must be verified
Survey Operations Limited 2013
Note:
N
Reproduction in whole or in part by any means
is prohibited without the prior permission of
Survey Operations Limited.
approval of Survey Operations Ltd.
used for Construction without the written
Mapping purposes only and should not be
Survey Control Markers established for
Client
Nicol Thomas
heights.
Levels in parenthesis indicate top of wall
All levels relate to Ordnance Datum,
Grid. Orientation to National Grid.
The survey is plotted on a plane local
OS National GPS Network.
achieved using the
grid. All levels relate to Ordnance Datum,
A - 10/09/13 - Orientation now to national
Revision - Date - Description
achieved using the OS National GPS Network.
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX C: PROPOSED PLANNING LAYOUT
This page has been left intentionally blank
1500
2000
2000
2000
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:(Job number)
1:2
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Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX D: EA FLOODING INFORMATION & CORRESPONDENCE
This page has been left intentionally blank
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10/31/13 Environment Agency - What's in your backyard?
maps.environment-agency.gov.uk/wiyby/wiybyController?topic=floodmap&layerGroups=default&lang=_e&ep=map&scale=11&x=381966&y=422719 1/2
Data search Text only versionMap legend
Click on the map to seewhat is the Risk of Floodingat a particular location.
Flood Maps
Flooding from rivers orsea without defences
Extent of extreme flood
Flood defences(Not all may be shown*)
Areas benefiting fromflood defences(Not all may be shown*)
Main rivers
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Risk of Flooding from Rivers and Sea
Risk of Flooding from Rivers andSea
Map of X: 381,966; Y: 422,719 at scale 1:10,000
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Contains Royal Mail data © Royal Mail copyright and database right 2013.This service is designed to inform members of the public, in l ine with our terms and conditions. For business or commercial use, please contact us.
More about flooding:
Information Warning: Newport, South Wales
We are aware of problems with the flood map for the Newport area. Please contact your local Natural Resources Wales office for accurate information. We are currently working to correct this information. Natural Resources Wales Website
Understanding the flood map
A more detailed explanation to help you understand the flood map shown above.
Current flood warnings
We provide flood warnings online 24 hours a day. Find out the current flood warning status in your local area.
Flood map - your questions answered
Answers to commonly asked questions about the flood map.
* Legend Information: Flood defences and the areas benefiting from them are gradually being added throughupdates. Please contact your local environment agency office for further details.
10/31/13 Environment Agency - What's in your backyard?
maps.environment-agency.gov.uk/wiyby/wiybyController?ep=query&floodrisk=0&lang=_e&topic=floodmap&floodX=381952&floodY=422734 1/1
Author: The Environment Agency | [email protected] updated: 17th October 2013
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Flood Risk for X:381952, Y:422734
Be prepared
We do not have an assessment of flood risk for the area which you have selected. This may be because the areaselected is outside the floodplain. It could also be because we have been unable to assess the likelihood of floodingfor this area because we did not have sufficient information (this applies to fewer than 1% of the properties inEngland and Wales in the flood outline)
For a fuller explanation of flood likelihood, click here.
Be aware:
Our maps only cover flooding from rivers and the sea. Flooding can occur at any time and in any place fromsources such as rising ground water levels, burst water mains, road drains, run-off from hillsides, seweroverflows etc.Click here to find out more.To find out how to be prepared for all types of flooding go to our Floodline pages or call Floodline on tel: 0845988 1188.The information on the likelihood of flooding is not intended to be used by people applying for planningpermission for new developments. To find out how the Flood Map can help when planning a new development,click here.
10/31/13 Environment Agency - What's in your backyard?
maps.environment-agency.gov.uk/wiyby/wiybyController?topic=reservoir&layerGroups=default&lang=_e&ep=map&scale=11&x=381966&y=422719 1/2
Data search Text only versionMap legend
Click within the extent offlooding to see whichreservoirs affect this area
Risk of Flooding fromReservoirs
Maximum extent offlooding
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Risk of Flooding from Reservoirs
Risk of Flooding from Reservoirs
Map of X: 381,966; Y: 422,719 at scale 1:10,000
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More about reserv oir f looding:
This map shows the largest area that might be flooded if a reservoir were to fail and release the water it holds.Since this is a worst case scenario, it's unlikely that any actual flood would be this large.
Click within a green shaded area to find details of the reservoirs that could cause flooding in that area, and the localauthority.
The reservoir flood map displays information for large reservoirs holding over 25,000 cubic meters of water. It doesnot display information for smaller reservoirs or for reservoirs commissioned after reservoir mapping began in spring2009. The map also does not display information about how likely any area is to be flooded or about the depth orspeed of the flood waters.
How safe are reservoirs?
Reservoir flooding is extremely unlikely to happen. There has been no loss of life in the UK from reservoir floodingsince 1925. All large reservoirs must be inspected and supervised by reservoir panel engineers. As the enforcementauthority for the Reservoirs Act 1975 in England, we ensure that reservoirs are inspected regularly and essentialsafety work is carried out.
However, in the unlikely event that a reservoir dam failed, a large volume of water would escape at once and floodingcould happen with little or no warning. If you live or work in an area that could be affected, you should plan inadvance what you would do in an emergency. You may need to evacuate immediately. Consider where you wouldgo to safety, and be ready to follow the advice of emergency services.
To find out about local emergency plans, contact the local authority listed when you click in the green shaded areaon the map. Be aware that they may not be able to give you any specific information immediately as developingreservoir emergency plans is a new responsibility.
10/31/13 Environment Agency - What's in your backyard?
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Interactive Maps
Risk of Flooding from Reserv oirs
Below are the reservoirs that could affect this area.
Page 1 of 1 (2 results for selected location)
Cowpe
Reservoir Owner: United Utilities Water plc
Reservoir location(grid reference):384140, 420278
Environment AgencyArea: South Area inNorth West Region
LocalAuthority:LancashireCounty
Additional Comments: If you havequestions about local emergencyplans for this reservoir you shouldcontact the named Local Authority
View map
Cloughbottom
Reservoir Owner: United Utilities Water plc
Reservoir location(grid reference):384617, 426715
Environment AgencyArea: South Area inNorth West Region
LocalAuthority:LancashireCounty
Additional Comments: If you havequestions about local emergencyplans for this reservoir you shouldcontact the named Local Authority
View map
More about reserv oir f looding:
This map shows the largest area that might be flooded if a reservoir were to fail and release the water it holds.Since this is a worst case scenario, it's unlikely that any actual flood would be this large.
Click within a green shaded area to find details of the reservoirs that could cause flooding in that area, and the localauthority.
The reservoir flood map displays information for large reservoirs holding over 25,000 cubic meters of water. It doesnot display information for smaller reservoirs or for reservoirs commissioned after reservoir mapping began in spring2009. The map also does not display information about how likely any area is to be flooded or about the depth orspeed of the flood waters.
How safe are reservoirs?
Reservoir flooding is extremely unlikely to happen. There has been no loss of life in the UK from reservoir floodingsince 1925. All large reservoirs must be inspected and supervised by reservoir panel engineers. As the enforcementauthority for the Reservoirs Act 1975 in England, we ensure that reservoirs are inspected regularly and essentialsafety work is carried out.
However, in the unlikely event that a reservoir dam failed, a large volume of water would escape at once and floodingcould happen with little or no warning. If you live or work in an area that could be affected, you should plan inadvance what you would do in an emergency. You may need to evacuate immediately. Consider where you wouldgo to safety, and be ready to follow the advice of emergency services.
To find out about local emergency plans, contact the local authority listed when you click in the green shaded areaon the map. Be aware that they may not be able to give you any specific information immediately as developingreservoir emergency plans is a new responsibility.
10/31/13 Environment Agency - What's in your backyard?
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Data search Text only versionMap legend
Click on an area for details.
Flood Warning Areas
Areas where we issueflood warnings
Flood Alert Areas
Areas where we issueflood alerts
River level monitoring(hi-flows)
River level monitoring(hi-flows)
River and Sea levels
River and Sea levels
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Flood Warning Areas
Flood Warning
Map of X: 381,966; Y: 422,719 at scale 1:10,000
Customers in Wales - From 1 April 2013 Natural Resources Wales (NRW) will take over the responsibil ities of the Environment Agency in Wales.© Environment Agency copyright and database rights 2013. © Ordnance Survey Crown copyright. All rights reserved. Environment Agency, 100026380.
Contains Royal Mail data © Royal Mail copyright and database right 2013.This service is designed to inform members of the public, in l ine with our terms and conditions. For business or commercial use, please contact us.
More about Flood Warnings:
Flood Warning Areas
If your home or business is within a purple shaded area on the map then you can receive free flood warnings. Weissue flood warnings to specific areas when flooding is expected. If you receive a flood warning you shouldtake immediate action.
For futher information visit our Flood warning pages.
Flood Alert Areas
If your home or business is within a pink shaded area on the map then you can receive free flood alerts. We issueflood alerts when flooding is possible. In many areas we issue flood alerts for flooding from rivers, the sea andgroundwater. If you receive a flood alert you should be prepared for flooding and to take action.
It is very difficult to predict the exact location of flooding from groundwater as it is often related to local geology. Wecan’t say for definite which properties are at risk from groundwater flooding. To help people we provide flood alertsfor large areas that could be affected if groundwater levels were high.
For futher information visit our Flood warning pages.
Riv er Lev els
River level monitoring sensors are placed in the waters at key points and measure changes in water level. This datais recorded at 15 minute intervals; it's then sent back to our offices to be published online at least once a day. Theinformation may be updated more frequently to meet operational needs, for example when water levels are high.This is the most up to date information available about river and sea levels.
For futher information visit our River and Sea Levels pages.
10/31/13 Environment Agency - What's in your backyard?
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Data search Text only versionMap legend
Groundwater sourceprotection zones
Inner zone(Zone 1)
Outer zone(Zone 2)
Total catchment(Zone 3)
Special interest(Zone 4)
Aquifer Maps -Superficial DepositsDesignation
Principal
Secondary A
Secondary B
Secondary(undifferentiated)
Unknown (lakes andlandslip)
Aquifer Maps - BedrockDesignation
Principal
Secondary A
Secondary B
Secondary(undifferentiated)
GroundwaterVulnerability Zones
Major Aquifer High
Major AquiferIntermediate
Major Aquifer Low
Minor Aquifer High
Minor AquiferIntermediate
Minor Aquifer Low
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Groundwater
Groundwater
X: 381,966;Y: 422,719 at scale 1:10,000
Customers in Wales - From 1 April 2013 Natural Resources Wales (NRW) will take over the responsibil ities of the Environment Agency in Wales.© Environment Agency copyright and database rights 2013. © Ordnance Survey Crown copyright. All rights reserved. Environment Agency, 100026380.
Contains Royal Mail data © Royal Mail copyright and database right 2013.This service is designed to inform members of the public, in l ine with our terms and conditions. For business or commercial use, please contact us.
More about Groundwater
Brit ish Geological Surv ey Aquifer data:
The Aquifer Extents are not displayed at scales greater than 1:75,000 (Ordnance Survey 1:250,000 scale) as thedata was only modelled to this level and is not accurate pass this.
New BGS Aquifer Designation Maps
From 1st April 2010 new aquifer designations replace the old system of classifying aquifers as Major, Minor andNon-Aquifer. This new system is in line with our Groundwater Protection Policy (GP3) and the Water FrameworkDirective (WFD) and is based on British Geological Survey mapping.
Groundwater Source Protection Zones data:
The Source Protection Zones are not displayed at scales greater than 1:20,000 (Ordnance Survey 1:50,000 scale)as the data was only modelled to this level and is not accurate pass this. They should not be compared againstfield boundaries.
Groundwater Source Protection Zones
Groundwater provides a third of our drinking water. We ensure that your water is safe to drink defining SourceProtection Zones. These zones help to monitor the risk of contamination from any activities that might causepollution in the area.
Facts and figures of our groundwater resources
Find out more about groundwater and groundwater levels.
1
Chris Pickles
From: Chris PicklesSent: 30 October 2013 12:30 PMTo: [email protected]: Whinberry View, RowtenstallAttachments: Location Plan.pdf
To whom it may concern, Whinberry View, Rowtenstall BB4 7PA Please could you provide product 4. In addition, please could you confirm whether you have any information that you feel would be valuable to a Flood Risk Assessment for the above site (location plan attached), including details of historical flooding; this would be greatly appreciated. Please do not hesitate to contact me on the details below to discuss further should you require additional information or clarification. Kind regards
Christopher Pickles
Engineering Technician
Betts Associates Ltd
Old Marsh Farm Barns, Welsh Road, Sealand, Flintshire, CH5 2LY
T ‐ 01244 288178
F ‐ 01244 288516
chris.pickles@betts‐associates.co.uk
www.betts‐associates.co.uk
CIVIL | STRUCTURAL | GEO‐ENVIRONMENTAL | TECHNICAL DUE DILIGENCE
FLOOD RISK MANAGEMENT | STRUCTURAL SURVEYS | PARTY WALL DUTIES | ECOLOGY
ELECTRONICALLY TRANSMITTED INFORMATION
This electronic transmission is strictly confidential and intended solely for the addressee. It may contain information which is covered by legal, professional or other privilege. If you are not the intended addressee, you must not disclose, copy or take any action in reliance of this transmission. If you have received this transmission in error, please notify us as soon as possible. All emails transmitted by Betts Associates are virus checked. This does not guarantee that transmissions are virus free. Reference should always be made to the hard copy of any electronically transmitted files. Electronic data does not constitute contract documentation. Use of the content of our files is at your own risk. You remain responsible for anything produced using all or part of the data supplied.
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX E: FEH CATCHMENT DATA & DESCRIPTORS
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Slaidburn
Gisburn
ChatburnCowling
Hurst Green
Kildwick
Stanbury
Mytholmroyd
Lumb
Laycock
Cragg
Low Bradley
Chisley
Newton
Diggle
Tintwistle
Astley
East Marton
Thornton-in-Craven
Kelbrook
Wycoller
Walshaw
Walsden
Portsmouth
Chatterton
Uppermill
Paythorne
Summerseat
Rimington
Foulridge
Belthorn
Barley
Mereclough
Helmshore
Barrow
Hapton
Langho Read
Cheetwood
Patricroft
Daubhill
Blackley
Astley Bridge
Broughton
Top of Hebers
Hindle Fold
Nappa
Copley
Heyrod
Widdop
Bank Newton
Salesbury
Skipton
Todmorden
Stretford
Clitheroe
Prestwich
Darwen
Hyde
Nelson
Barnoldswick
Colne
Rawtenstall
Failsworth
Accrington
Whalley Brierfield
Littleborough
Worsley
Walkden
HeywoodShaw
Ramsbottom
Irlam
Mossley
Bacup
Whitworth
Rishton
Burnley
Oldham
BoltonBury
Rochdale
Manchester
4 00 000m
4 00 000m
4 00 000m
4 00 000m
4 05 000m
4 54 000m4 05
000m4 54 000m
66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 0293
95
97
02
04
06
08
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12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
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52
66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 02 04
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0 52.5Kilometres 381900 422650 [SD 81900 22650]
Printed from FEH
CD-RO
M 3 at 13:54 on 31-O
ct-2013.©
NERC (CEH
). © Crown copyright. ©
AA
. 2009. All rights reserved.
VERSION FEH CD‐ROM Version 3 exported at 13:53:42 GMT Thu 31‐Oct‐13
CATCHMENT GB 381900 422650 SD 81900 22650
AREA 46.49
ALTBAR 326
ASPBAR 266
ASPVAR 0.16
BFIHOST 0.48
DPLBAR 7.15
DPSBAR 115.1
FARL 0.967
LDP 12.77
PROPWET 0.57
RMED‐1H 11.5
RMED‐1D 42.8
RMED‐2D 59.6
SAAR 1411
SAAR4170 1421
SPRHOST 33.59
URBCONC1990 0.514
URBEXT1990 0.0392
URBLOC1990 0.764
C ‐0.0255
D1 0.38783
D2 0.41333
D3 0.42093
E 0.30576
F 2.51342
C(1 km) ‐0.025
D1(1 km) 0.386
D2(1 km) 0.473
D3(1 km) 0.392
E(1 km) 0.302
F(1 km) 2.513
DESIGN RAINFALL DEPTHS
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
This page has been left intentionally blank
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX F: NPPF TECHNICAL GUIDANCE EXTRACTS
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Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX G: WATER COMPANY RECORDS & CORRESPONDENCE
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1
Chris Pickles
From: Chris PicklesSent: 30 October 2013 12:27 PMTo: 'Neil.O'[email protected]'Subject: Whinberry View, RowtenstallAttachments: Location Plan.pdf
To whom it may concern,
Whinberry View, Rowtenstall BB4 7PA
Please could you confirm whether you have any information that you feel would be valuable to a Flood RiskAssessment for the above site (location plan attached), including details of historical flooding; this would be greatlyappreciated.
Please do not hesitate to contact me on the details below to discuss further should you require additionalinformation or clarification.
Kind regards
Christopher Pickles
Engineering Technician
Betts Associates Ltd
Old Marsh Farm Barns, Welsh Road, Sealand, Flintshire, CH5 2LY
T 01244 288178
F 01244 288516
chris.pickles@betts associates.co.uk
www.betts associates.co.uk
CIVIL | STRUCTURAL | GEO ENVIRONMENTAL | TECHNICAL DUE DILIGENCE
FLOOD RISK MANAGEMENT | STRUCTURAL SURVEYS | PARTY WALL DUTIES | ECOLOGY
ELECTRONICALLY TRANSMITTED INFORMATION
This electronic transmission is strictly confidential and intended solely for the addressee. It may contain information which is covered by legal, professional or other privilege. If you are not the intended addressee, you must not disclose, copy or take any action in reliance of this transmission. If you have received this transmission in error, please notify us as soon as possible. All emails transmitted by Betts Associates are virus checked. This does not guarantee that transmissions are virus free. Reference should always be made to the hard copy of any electronically transmitted files. Electronic data does not constitute contract documentation. Use of the content of our files is at your own risk. You remain responsible for anything produced using all or part of the data supplied.
UU
Map
s fo
r S
afe
Dig
Cop
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U 2
012.
Thi
s pl
an is
bas
ed o
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Sur
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Map
with
the
sanc
tion
of th
e C
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r of
H.M
. Sta
tiona
ry O
ffice
. C
row
n an
d U
nite
d U
tiliti
es W
ater
cop
yrig
hts
are
rese
rved
. Una
utho
rised
rep
rodu
ctio
n w
ill in
frin
ge th
ese
copy
right
s.
The
pos
ition
of
the
und
ergr
ound
app
arat
us s
how
n o
n th
is p
lan
is a
ppro
xim
ate
onl
y a
nd is
giv
en in
acc
orda
nce
with
the
bes
t in
form
atio
n c
urre
ntly
ava
ilabl
e. T
he a
ctua
l pos
ition
s m
ay b
e d
iffer
ent
from
thos
e s
how
n o
n th
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lan
and
priv
ate
ser
vice
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es m
ay b
e s
how
n b
y a
blu
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roke
n li
ne. U
nite
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tiliti
es W
ater
will
not
acc
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liabi
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for
any
dam
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caus
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y th
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pos
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bei
ng d
iffer
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thos
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Dat
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Sca
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pp
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2013
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4227
38
1
Richard Nicholas
From: Martin PocockSent: 01 November 2013 15:05To: Richard NicholasSubject: FW: ref 110 - 12/9 - FW: Whinberry View, Bacup Road, RawtenstallAttachments: sea94 Wastewater_predevelopment_enquiry.pdf; Location Plan.pdf; Existing
catchment calcs 11.09.13.pdf; Existing Catchment.pdf; Proposed catchment.pdf; ICP suds 11.09.13.pdf
Importance: High
From: Perry, Graham [mailto:[email protected]]Sent: 12 September 2013 14:47 To: Martin Pocock Cc: Wastewater Developer Services Subject: FW: ref 110 - 12/9 - FW: Whinberry View, Bacup Road, Rawtenstall Importance: High
Hello Martin
Having reviewed your proposal I can confirm that foul will be allowed to drain freely into the public combined / foulsewer while surface water must be restricted to 31.4 l/s which must connect to the public surface water sewer onBacup Road if you need to connect to the public sewer at all.
Thanks
Graham PerryDevelopment EngineerDeveloper Services and PlanningBusiness OperationsUnited UtilitiesT: 01925 679405 (internal 79405)unitedutilities.com
From: Wastewater Developer Services Sent: 12 September 2013 08:43 To: Perry, Graham Subject: ref 110 - 12/9 - FW: Whinberry View, Bacup Road, Rawtenstall Importance: High
From: Martin Pocock [mailto:[email protected]]Sent: 11 September 2013 14:53 To: Planning Liaison Cc: Perry, Graham; Daniel Connolly Subject: Whinberry View, Bacup Road, Rawtenstall Importance: High
Graham
Trust you are well.
2
I have attached a pre development enquiry form for 23 unit scheme on a brownfield site.We are proposing to utilise the existing connections.I would be grateful if you could review and confirm the surface water discharge rate.The proposed site will have a section agreement.
Regards
Martin Pocock BEng(Hons) CEng MICE C.WEM MCIWEM
Betts AssociatesTechnical Director
Head Office Tel: – 01244 288178 Fax: – 01244 288516 Mobile: – 07792 460043
STRUCTURAL CIVIL GEO-ENVIRONMENTAL FLOOD RISK ANALYSIS STRUCTURAL SURVEYS PARTY WALL DUTIES ECOLOGY
Please consider the environment before printing this email.
ELECTRONICALLY TRANSMITTED INFORMATION
This electronic transmission is strictly confidential and intended solely for the addressee. It may contain information which is covered by legal, professional or other privilege. If you are not the intended addressee, you must not disclose, copy or take any action in reliance of this transmission. If you have received this transmission in error, please notify us as soon as possible. All emails transmitted by Betts Associates are virus checked. This does not guarantee that transmissions are virus free. Reference should always be made to the hard copy of any electronically transmitted files. Electronic data does not constitute contract documentation. Use of the content of our files is at your own risk. You remain responsible for anything produced using all or part of the data supplied.
========================================================================================================================
The information contained in this e-mail is intended only for the individual to whom it is addressed. It may contain legally privileged or confidential information or otherwise be exempt from disclosure. If you have received this Message in error or there are any problems, please notify the senderimmediately and delete the message from your computer. You must not use, disclose, copy or alter this message for any unauthorised purpose. Neither United Utilities Group PLC nor any of its subsidiaries will be liable for any direct, special, indirect or consequential damages as a result of any virus beingpassed on, or arising from the alteration of the contents of this message by a third party.
United Utilities Group PLC, Haweswater House, Lingley Mere Business Park, Lingley Green Avenue, Great Sankey, Warrington, WA5 3LP Registered in England and Wales. Registered No 6559020
www.unitedutilities.comwww.unitedutilities.com/subsidiaries
Your Ref: SEA94/MDP
Our Ref: 13/ 962575
Date: 11/09/2013
BETTS ASSOCIATES LTDOLD MARSH FARM BARNSWELSH ROAD
SEALANDCH5 2LY
FAO:
Dear Sirs
Location:
I acknowledge with thanks your request dated
Please find enclosed plans showing the approximate position of our apparatus known to be in thevicinity of this site.I attach General Condition Information sheets, which details contact numbers for additional services(i.e. new supplies, connections, diversions) which we are unable to deal with at this office. In additionyou should ensure they are made available to anyone carrying out any works which may affect ourapparatus.
Martin Pocock
04/09/13 for information on the location of our services.
Yours Faithfully,
Sue McManus Operations Manager Property Searches
Property SearchesGround Floor Grasmere HouseLingley Mere Business ParkGreat SankeyWarringtonWA5 3LP
DX 715568 Warrington7Telephone 0870 751 0101
Fax Number 0870 7510102
United Utilities Water PLCRegistered in England & Wales No. 2366678Registered Office: Haweswater House,Lingley Mere Business Park, Lingley Green Avenue,Great Sankey, Warrington, WA5 3LP
UUWaterPLC/005/09-09
United Utilites Water PLC
If you have any queries regarding this matter please telephone us on 0870 7510101.
I trust the above meets with you requirements and look forward to hearing from you should you needanything further.
These provisions apply to the public sewerage, water distribution and telemetry systems (including sewerswhich are the subject of an agreement under Section 104 of the Water Industry Act 1991 and mains installedin accordance with the agreement for the self construction of water mains) (UUW apparatus) of United UtilitiesWater PLC (“UUW”).
TERMS AND CONDITIONS:
1. This Map and any information supplied with it is issued subject to the provisions contained below, to theexclusion of all others and no party relies upon any representation, warranty, collateral contract or otherassurance of any person (whether party to this agreement or not) that is not set out in this agreement or thedocuments referred to in it.
2. This Map and any information supplied with it is provided for general guidance only and no representation,undertaking or warranty as to its accuracy, completeness or being up to date is given or implied.
3. In particular, the position and depth of any UUW apparatus shown on the Map are approximate only. UUWstrongly recommends that a comprehensive survey is undertaken in addition to reviewing this Map todetermine and ensure the precise location of any UUW apparatus. The exact location, positions and depthsshould be obtained by excavation trial holes.
4. The location and position of private drains, private sewers and service pipes to properties are not normallyshown on this Map but their presence must be anticipated and accounted for and you are strongly advised tocarry out your own further enquiries and investigations in order to locate the same.
5. The position and depth of UUW apparatus is subject to change and therefore this Map is issued subject toany removal or change in location of the same. The onus is entirely upon you to confirm whether any changesto the Map have been made subsequent to issue and prior to any works being carried out.
6. This Map and any information shown on it or provided with it must not be relied upon in the event of anydevelopment, construction or other works (including but not limited to any excavations) in the vicinity of UUWapparatus or for the purpose of determining the suitability of a point of connection to the sewerage or otherdistribution systems.
7. No person or legal entity, including any company shall be relieved from any liability howsoever andwhensoever arising for any damage caused to UUW apparatus by reason of the actual position and/or depthsof UUW apparatus being different from those shown on the Map and any information supplied with it.
8. If any provision contained herein is or becomes legally invalid or unenforceable, it will be taken to besevered from the remaining provisions which shall be unaffected and continue in full force and affect.
9. This agreement shall be governed by English law and all parties submit to the exclusive jurisdiction of theEnglish courts, save that nothing will prevent UUW from bringing proceedings in any other competentjurisdiction, whether concurrently or otherwise.
TERMS AND CONDITIONS - WASTERWATER & WATER DISTRIBUTION PLANS
Copyright © United Utilities Water PLC 2011-08-02
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7
Please ensure that a copy of these conditions is passed to your representative and contractor on site.
1. United Utilities provides the approximate locations of its sewers according to its records. These records are not necessarily accurate or complete nor do they normally show the positions of every sewer culvert or drain, private connections from properties to the public sewers or the particulars of any private system. No person or company shall be relieved from liability for any damage caused by reason of the actual positions and/or depths being different from those indicated. The records do indicate the position of the nearest known public sewer from which the likely length of private connections can be estimated together with the need for any off site drainage rights or easements.
2. Special requirements relative to our sewers may be indicated. United Utilities employees or its contractors will visit any site at reasonable notice to assist in the location of its underground sewers and advise any precautions that may be required to obviate any damage. To arrange a visit or for further information regarding new supplies, connections, diversions, costing, or any notification required under these General Conditions, please call us on 0845746 2200.
3. Where public sewers are within a site which is to be developed and do not take any drainage from outside the area, they are from an operational viewpoint redundant. The developer must identify all redundant sewers affected by the development and apply to United Utilities in writing for these sewers to be formally closed. The developer shall bear all related costs of the physical abandonment work.
4. Public sewers within the site that are still live outside the area will be subject to a “Restricted Building zone”. This would normally be a surface area equivalent to the depth of the sewer measured from the centre line of the sewer on either side. No construction will be permitted within that zone. The developer should also note that deep and wide rooted trees must not be planted in close proximity to live sewers. Access to public sewers must be maintained at all times and no interference to manholes will be permitted during construction work.
5. Where there is a public sewer along the line of a proposed development/building, arrangements shall be made by the developer at his cost to divert the sewer around the development. Where this is not possible and as a last resort, a “Building Over Agreement” will need to be completed under section 18 of the Building Act 1984. The developer shall design building foundations to ensure that no additional loading is transferred to the sewer and submit such details both to the Local Authority’s Building Control Officer and to United Utilities for approval/acceptance. United Utilities on a rechargeable basis would normally undertake all aspects of design work associated with the diversion of any part of the operational wastewater network. For further advice please call asset protection on 01925678 306
6. Where there is a non-main river watercourse/culvert passing through the site, the landowner has the responsibility of a riparian owner for the watercourse/culvert and is responsible for the maintenance of the fabric of the culvert and for all works involved in maintaining the unrestricted flow through it. Building over the watercourse/culvert is not recommended. The developer must contact the local authority before any works are carried out on the watercourse/culvert. Where it is necessary to discharge surface water from the site into the watercourse/culvert the developer shall make an assessment of the available capacity of the watercourse/culvert (based on a 1 in 50 year event) and ensure that the additional flow to be discharged into the watercourse/culvert will not cause any flooding. In appropriate cases, flooding may be prevented by on-site storage. The developer shall submit the relevant details required to substantiate his development proposals. Details of any outfall proposed shall also be submitted to the Environment Agency, PO Box 12, Richard Fairclough House, Knutsford Road, Warrington, Cheshire, WA4 1HT for their approval.
7. Where there is a main river watercourse/culvert passing through the site, the developer shall submit all proposals affecting the river to the Environment Agency at the address stated in paragraph 6 for approval/acceptance.
8. Your attention is drawn also to the following:
• Private drains or sewers which may be within the site. On 1 October 2011 all privately owned sewers and lateral drains which communicate with (that is drain to) an existing public sewer as at 1 July 2011 will become the responsibility of the sewerage undertaker. This includes private sewers upstream of pumping stations that have yet to transfer, but excludes lengths of sewer or drain that are the subject of an on-going appeal or which have been excluded from transfer as a result of an appeal or which are on or under land opted-out by a Crown body. The transfer specifically excludes sewers and lateral drains owned by a railway undertaker. Sewers upstream of such assets, however, are transferred. Such assets may not be recorded on the public sewer record currently as it was not a requirement to keep records of previously private sewers and drains.
• Applications to make connections to the public sewer. The developer must write to United Utilities requesting an application form that must be duly completed and returned. No works on the public sewer shall be carried out until a letter of consent is received from United Utilities.
• Sewers for adoption. If an agreement for the adoption of sewers under Section 104 of the Water Industry Act 1991 is being contemplated, a submission in accordance with “Sewers for Adoption”, Seventh Edition, published by the Water Research Centre (2001) Plc, Henley Road, Medmenham, PO Box 16, Marlow, Buckinghamshire, SL7 2HD will be required, taking into consideration any departures from the general guide stipulated by United Utilities.
• Further consultation with United Utilities. Developers wishing to seek advice or clarification regarding sewer record information provided should contact United Utilities to arrange an appointment. A consultation fee may be charged, details of which will be made available at the time of making an appointment.
9. Combined sewers, foul sewers, surface water sewers, and pumped mains. These are shown separately in a range of colours or markings to distinguish them on our drawings, which are extracts from the statutory regional sewer map. A legend and key is provided on each extract for general use, although not all types of sewer will be shown on every extract.
Combined sewers shown coloured red carries both surface water and foul sewage, especially in areas where there is no separate surface water sewerage system.
Foul sewers coloured brown may also carry surface water and there may be no separate surface water system indicated in the immediate area. Both combined and foul sewers carry wastewater to our treatment works before it can safely be returned to the environment.
Surface water sewers coloured blue on our drawings are intended only to carry uncontaminated surface water (e.g. rainfall from roofs, etc) and they usually discharge into local watercourses. It is important for the protection of the environment and water quality that only uncontaminated surface water is connected to the surface water sewers. Improper connections to surface water sewers from sink wastes, washing machines and other domestic use of water can cause significant pollution of watercourses.
Pumped mains, rising mains and sludge mains will all be subject to pumping pressures and are neither suitable nor available for making new connections.
Highway drains, when included, show as blue and black dashed lines. Highway drains are not assetsbelonging to United Utilities and are the responsibility oflocal authorities.
10. For information regarding future proposals for construction of company apparatus please write to United Utilities, PO Box 453, Warrington, WA5 3QN.
11. For information regarding easements, deeds, grants or wayleaves please write to United Utilities Property Solutions, Coniston Buildings, Lingley Mere Business Park, Lingley Green Avenue, Great Sankey, Warrington WA5 3UU (Tel: 01925 731 365).
Conditions and in
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
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Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX H: LA CORRESPONDENCE
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1
Chris Pickles
From: Chris PicklesSent: 30 October 2013 12:23 PMTo: '[email protected]'Subject: Whinberry View, RowtenstallAttachments: Location Plan.pdf
To whom it may concern, Whinberry View, Rowtenstall BB4 7PA Please could you confirm whether you have any information that you feel would be valuable to a Flood Risk Assessment for the above site (location plan attached), including details of historical flooding; this would be greatly appreciated. Please do not hesitate to contact me on the details below to discuss further should you require additional information or clarification. Kind regards
Christopher Pickles
Engineering Technician
Betts Associates Ltd
Old Marsh Farm Barns, Welsh Road, Sealand, Flintshire, CH5 2LY
T ‐ 01244 288178
F ‐ 01244 288516
chris.pickles@betts‐associates.co.uk
www.betts‐associates.co.uk
CIVIL | STRUCTURAL | GEO‐ENVIRONMENTAL | TECHNICAL DUE DILIGENCE
FLOOD RISK MANAGEMENT | STRUCTURAL SURVEYS | PARTY WALL DUTIES | ECOLOGY
ELECTRONICALLY TRANSMITTED INFORMATION
This electronic transmission is strictly confidential and intended solely for the addressee. It may contain information which is covered by legal, professional or other privilege. If you are not the intended addressee, you must not disclose, copy or take any action in reliance of this transmission. If you have received this transmission in error, please notify us as soon as possible. All emails transmitted by Betts Associates are virus checked. This does not guarantee that transmissions are virus free. Reference should always be made to the hard copy of any electronically transmitted files. Electronic data does not constitute contract documentation. Use of the content of our files is at your own risk. You remain responsible for anything produced using all or part of the data supplied.
1
Chris Pickles
From: Adrian Smith <[email protected]>Sent: 30 October 2013 3:00 PMTo: Chris PicklesCc: Gwen MarlowSubject: FW: Whinberry View, RowtenstallAttachments: Location Plan.pdf
Dear Chris The mapping I have available does not show flooding affecting this particular site though there are risk areas within75 metres both south and east. I have asked colleagues who are more familiar with historic flood data to contact you if they are aware of anything that may affect this location. Thanks Adrian Smith Forward Planning Rossendale BC Room 119 Business Centre Futures Park Bacup Lancashire OL13 0BB 01706 252419 [email protected] www.rossendale.gov.uk
‐ From: Chris Pickles [mailto:chris.pickles@betts-associates Fears Raised as Bank Announces Branch Closure – Barclays has assured staff that there will be no redundancies as a result of the decision, which was taken due to ‘low customer use’. Haslingden Councillor Gladys Sandiford has raised concerns over the decision; “This is another thing disappearing from the high street. People will now have to travel away from Haslignden to get their money out of the bank.”
.co.uk] Sent: 30 October 2013 12:23 To: Forward Planning Subject: Whinberry View, Rowtenstall To whom it may concern, Whinberry View, Rowtenstall BB4 7PA
2
Please could you confirm whether you have any information that you feel would be valuable to a Flood Risk Assessment for the above site (location plan attached), including details of historical flooding; this would be greatly appreciated. Please do not hesitate to contact me on the details below to discuss further should you require additional information or clarification. Kind regards
Christopher Pickles
Engineering Technician
Betts Associates Ltd
Old Marsh Farm Barns, Welsh Road, Sealand, Flintshire, CH5 2LY
T ‐ 01244 288178
F ‐ 01244 288516
chris.pickles@betts‐associates.co.uk
www.betts‐associates.co.uk
CIVIL | STRUCTURAL | GEO‐ENVIRONMENTAL | TECHNICAL DUE DILIGENCE
FLOOD RISK MANAGEMENT | STRUCTURAL SURVEYS | PARTY WALL DUTIES | ECOLOGY
ELECTRONICALLY TRANSMITTED INFORMATION
This electronic transmission is strictly confidential and intended solely for the addressee. It may contain information which is covered by legal, professional or other privilege. If you are not the intended addressee, you must not disclose, copy or take any action in reliance of this transmission. If you have received this transmission in error, please notify us as soon as possible. All emails transmitted by Betts Associates are virus checked. This does not guarantee that transmissions are virus free. Reference should always be made to the hard copy of any electronically transmitted files. Electronic data does not constitute contract documentation. Use of the content of our files is at your own risk. You remain responsible for anything produced using all or part of the data supplied.
Disclaimer The information contained in this communication from [email protected] sent on 2013-10-30 at 15:00:13 is confidential and may be legally privileged. It is intended solely for use by [email protected] and others authorised to receive it. If you are not [email protected] you are hereby notified that any disclosure, copying, distribution or taking action in reliance of the contents of this information is strictly prohibited and may be unlawful.
As a public body, Rossendale Borough Council may be required to disclose this email or any response to it under the Freedom of Information Act 2000, unless the information in it is covered by one of the exemptions in the Act. Please immediately contact the sender if you have received this message in error. If you are not the intended recipient, please contact us immediately, delete the message from your computer
1
Chris Pickles
From: Chris PicklesSent: 30 October 2013 12:20 PMTo: '[email protected]'Subject: Whinberry View, RowtenstallAttachments: Location Plan.pdf
To whom it may concern, Whinberry View, Rowtenstall BB4 7PA Please could you confirm whether you have any information that you feel would be valuable to a Flood Risk Assessment for the above site (location plan attached), including details of historical flooding; this would be greatly appreciated. Please do not hesitate to contact me on the details below to discuss further should you require additional information or clarification. Kind regards
Christopher Pickles
Engineering Technician
Betts Associates Ltd
Old Marsh Farm Barns, Welsh Road, Sealand, Flintshire, CH5 2LY
T ‐ 01244 288178
F ‐ 01244 288516
chris.pickles@betts‐associates.co.uk
www.betts‐associates.co.uk
CIVIL | STRUCTURAL | GEO‐ENVIRONMENTAL | TECHNICAL DUE DILIGENCE
FLOOD RISK MANAGEMENT | STRUCTURAL SURVEYS | PARTY WALL DUTIES | ECOLOGY
ELECTRONICALLY TRANSMITTED INFORMATION
This electronic transmission is strictly confidential and intended solely for the addressee. It may contain information which is covered by legal, professional or other privilege. If you are not the intended addressee, you must not disclose, copy or take any action in reliance of this transmission. If you have received this transmission in error, please notify us as soon as possible. All emails transmitted by Betts Associates are virus checked. This does not guarantee that transmissions are virus free. Reference should always be made to the hard copy of any electronically transmitted files. Electronic data does not constitute contract documentation. Use of the content of our files is at your own risk. You remain responsible for anything produced using all or part of the data supplied.
1
Chris Pickles
From: ENV Flood Risk Management <[email protected]>Sent: 30 October 2013 12:21 PMTo: Chris PicklesSubject: Auto Reply
Thank you for contacting the Flood Risk Management Team at Lancashire County Council. Your enquiry has been logged and will be dealt with by our Technical Staff as soon as possible. Should you have any questions, please contact the Flood Risk Management Team on 01772 535924
Want to stop smoking? Call your Stop Smoking Service: North Lancashire: 01524 845145 East, Central and West Lancashire: 0800 328 6297 or visit http://www.smokefree.nhs.uk/Stoptober
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This e-mail contains information intended for the addressee only.
It may be confidential and may be the subject of legal and/or professional privilege.
If you are not the addressee you are not authorised to disseminate, distribute, copy or use this e-mail or any attachment to it.
The content may be personal or contain personal opinions and unless specifically stated or followed up in writing, the content cannot be taken to form a contract or to be an expression of the County Council's position.
Lancashire County Council reserves the right to monitor all incoming and outgoing email.
Lancashire County Council has taken reasonable steps to ensure that outgoing communications do not contain malicious software and it is your responsibility to carry out any checks on this email before accepting the email and opening attachments.
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX I: SURFACE WATER RUN‐OFF CALCULATIONS
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Betts Associates Ltd Page 1
Old Marsh Farm Barns Whinberry View
Welsh Road Rawtenstall
Sealand Flintshire ...
Date 31.10.2013 Designed by CP
File Checked by RDN
Micro Drainage Network 2013.1.1
Rainfall profile
©1982-2013 Micro Drainage Ltd
Storm duration (mins) 360
FEH DataC(1km) -0.025D1(1km) 0.386D2(1km) 0.473D3(1km) 0.392E(1km) 0.302F(1km) 2.513
Peak Intensity (mm/hr) 16.102Ave. Intensity (mm/hr) 4.108Return Period (years) 1
Betts Associates Ltd Page 1
Old Marsh Farm Barns
Welsh Road
Sealand Flintshire CH5 2LY
Date 24/10/2014 10:39 Designed by Chris.Pickles
File Checked by
Micro Drainage Network 2014.1
Rainfall profile
©1982-2014 XP Solutions
Storm duration (mins) 360
FEH DataC(1km) -0.025D1(1km) 0.386D2(1km) 0.473D3(1km) 0.392E(1km) 0.302F(1km) 2.513
Peak Intensity (mm/hr) 38.452Ave. Intensity (mm/hr) 9.809Return Period (years) 30
Betts Associates Ltd Page 1
Old Marsh Farm Barns Whinberry View
Welsh Road Rawtenstall
Sealand Flintshire ...
Date 31.10.2013 Designed by CP
File Checked by RDN
Micro Drainage Network 2013.1.1
Rainfall profile
©1982-2013 Micro Drainage Ltd
Storm duration (mins) 360
FEH DataC(1km) -0.025D1(1km) 0.386D2(1km) 0.473D3(1km) 0.392E(1km) 0.302F(1km) 2.513
Peak Intensity (mm/hr) 52.570Ave. Intensity (mm/hr) 13.411Return Period (years) 100
Betts Associates Ltd Page 1
Old Marsh Farm Barns
Welsh Road
Sealand Flintshire CH5 2LY
Date 24/10/2014 10:45 Designed by Chris.Pickles
File Checked by
Micro Drainage Source Control 2014.1
ICP SUDS Mean Annual Flood
©1982-2014 XP Solutions
Input
Return Period (years) 1 Soil 0.336Area (ha) 0.467 Urban 0.000SAAR (mm) 1411 Region Number Region 10
Results l/s
QBAR Rural 2.5QBAR Urban 2.5
Q1 year 2.2
Q1 year 2.2Q30 years 4.2Q100 years 5.1
Betts Associates Ltd Page 1
Old Marsh Farm Barns
Welsh Road
Sealand Flintshire CH5 2LY
Date 24/10/2014 10:46 Designed by Chris.Pickles
File Checked by
Micro Drainage Source Control 2014.1
Greenfield Runoff Volume
©1982-2014 XP Solutions
FEH Data
Return Period (years) 1Storm Duration (mins) 360
Site Location GB 381900 422650 SD 81900 22650C(1km) -0.025D1(1km) 0.386D2(1km) 0.473D3(1km) 0.392E(1km) 0.302F(1km) 2.513
Areal Reduction Factor 1.00Area (ha) 0.467SAAR (mm) 1411
CWI 124.285SPR Host 33.590
URBEXT (1990) 0.0392
Results
Percentage Runoff (%) 34.29Greenfield Runoff Volume (m³) 39.471
Betts Associates Ltd Page 1
Old Marsh Farm Barns
Welsh Road
Sealand Flintshire CH5 2LY
Date 24/10/2014 10:47 Designed by Chris.Pickles
File Checked by
Micro Drainage Source Control 2014.1
Greenfield Runoff Volume
©1982-2014 XP Solutions
FEH Data
Return Period (years) 100Storm Duration (mins) 360
Site Location GB 381900 422650 SD 81900 22650C(1km) -0.025D1(1km) 0.386D2(1km) 0.473D3(1km) 0.392E(1km) 0.302F(1km) 2.513
Areal Reduction Factor 1.00Area (ha) 0.467SAAR (mm) 1411
CWI 124.285SPR Host 33.590
URBEXT (1990) 0.0392
Results
Percentage Runoff (%) 40.15Greenfield Runoff Volume (m³) 150.865
SURFACE WATER RUN‐OFF CALCULATION SHEET
Development Whinberry View, Rawtenstall
Project No. FRA237
Revision 1.1 Completed by CP
Date 24.10.2014 Checked by RDN
Areas Catchment Charateristics
Total Site 0.751 ha SAAR 1411 mm
Development Area (for SW Strategy)* 0.751 ha SPR 33.6 %
Existing Impermeable 0.284 ha 38% i1 16.1 mm/hr
Existing Impermeable (for SW Strategy) 0.284 ha 38% i30 38.4 mm/hr
Existing Pervious 0.467 ha 62% i100 52.5 mm/hr
Existing Pervious (for SW Strategy) 0.467 ha 62% d1 13.4 mm
Proposed Impermeable (total) 0.449 ha 60% d100 75.7 mm
Proposed Impermeable (domestic only) ha
Run‐off Rates Volumes
Pre‐development Pre‐development
1yr 12.7 l/s 1yr 38.1 cu.m
30yr 30.3 l/s 100yr 215.0 cu.m
100yr 41.4 l/s 1yr 39.4 cu.m
50mm/hr 39.4 l/s 100yr 150.8 cu.m
1yr 2.2 l/s 1yr 77.5 cu.m
30yr 4.2 l/s 100yr 365.8 cu.m
100yr 5.1 l/s
QBar 2.5 l/s Post‐development
1yr 14.9 l/s * 1yr 60.2 cu.m
30yr 34.5 l/s 100yr+CC 441.9 cu.m
100yr 46.5 l/s * 1yr cu.m
Post‐development 100yr+CC cu.m
1yr 20.1 l/s
30yr 47.9 l/s ‐21% ‐76.1 cu.m
100yr+CC 85.1 l/s cu.m
1yr l/s
30yr l/s
100yr+CC l/s
Quick storage Estimate
low high mean Imp. Area (ha) Max. Discharge (l/s) Rainfall CC
Return Period 1yr 13 32 22.5 0.449 14.9 FEH 0
Return Period 30yr 0 0.449 FEH 0
Return Period 100yr+CC 140 228 184 0.449 31.4 FEH 30%
Return Period 1yr 11 34 22.5 0.449 14.9 FSR 0
Return Period 30yr 0 0.449 FSR 0
Return Period 100yr+CC 91 183 137 0.449 31.4 FSR 30%
* Development Area (for SW strategy) is reduced as infiltration is being applied as a partial solution
Impermeable
Pervious
Total
Impermeable
Pervious
Total
Impermeable (total)
Impermeable (domestic only)
Reduction (total)
Reduction (domestic only)
Impermeable (total)
Impermeable (domestic only)
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX J: IMPERMEABLE AREAS PLANS
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1
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1
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1
0
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100Ø
SW
SW
SW
100Ø
100Ø
1
0
0
Ø
1
0
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Ø
1
0
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Ø
1
0
0
Ø
1
0
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1
0
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1
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0
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FW
FW
1
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0
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1
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0
Ø
1
0
0
Ø
1
0
0
Ø
1
0
0
Ø
FW
UT
L
DO
N
OT
S
CA
LE
PR
EL
IM
IN
AR
Y
P2
10
0F
RA
23
7
IM
PE
RM
EA
BL
E A
RE
AS
P
LA
N
PR
E-D
EV
EL
OP
ME
NT
RA
WT
EN
ST
AL
L
WH
IN
BE
RR
Y V
IE
W
NO
TE
S
TOTAL SITE AREA - 7513m²
EXISTING IMPERMEABLE AREA - 2846m² (38%)
P1
31.10.2013
CP
PR
ELIM
IN
AR
Y IS
SU
E F
OR
R
EV
IE
W R
DN
P2
23.10.2014
CP
UP
DA
TE
D T
O R
EF
LE
CT
R
EV
IS
ED
B
OU
ND
AR
Y R
DN
X
FL
17
2.2
2
FL
17
2.3
0
17
3.7
2
EA
VE
S
17
8.3
2
RID
GE
18
1.7
6
EA
VE
S
17
9.1
6
RID
GE
18
2.6
6
EA
VE
S
17
4.2
6
RID
GE
18
4.3
0
EA
VE
S
18
1.7
1
EA
VE
S
17
8.6
2
RID
GE
18
1.6
4
EA
VE
S
EA
VE
S
17
8.8
6
17
8.9
4
17
6.0
2
EA
VE
S
17
8.5
9
RID
GE
RID
GE
RID
GE
18
3.0
4
18
1.6
0
18
0.7
3
EA
VE
S
EA
VE
S
EA
VE
S
17
7.0
2
17
7.6
5
17
9.0
2
BO
L
CB
BO
L
PT
BO
L
BO
L
BS
LP
CB
LP
CB
PT
TB
LP
CB
LP
PB
LP
LP
LP
Note: F
loor areas m
easured are gross excluding w
all finishes
80.4 S
q.M
etres
80.4 S
q.M
etres
92.7 S
q.M
etres
92.7 S
q.M
etres
92.7 S
q.M
etres
92.7 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
92.7 S
q.M
etres
92.7 S
q.M
etres
104.3 S
q.M
etres
104.3 S
q.M
etres
104.3 S
q.M
etres
104.3 S
q.M
etres
104.3 S
q.M
etres
104.3 S
q.M
etres
104.3 S
q.M
etres
80.4 S
q.M
etres
80.4 S
q.M
etres
SC
HE
DU
LE
O
F A
CC
OM
MO
DA
TIO
N
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
4 B
ed 7 P
erson H
ouse
4 B
ed 7 P
erson H
ouse
4 B
ed 7 P
erson H
ouse
4 B
ed 7 P
erson H
ouse
4 B
ed 7 P
erson H
ouse
4 B
ed 7 P
erson H
ouse
4 B
ed 7 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
3 B
ed 5 P
erson H
ouse
865 S
q.F
t
865 S
q.F
t
997 S
q.F
t
997 S
q.F
t
997 S
q.F
t
997 S
q.F
t
865 S
q.F
t
865 S
q.F
t
865 S
q.F
t
865 S
q.F
t
865 S
q.F
t
865 S
q.F
t
865 S
q.F
t
865 S
q.F
t
865 S
q.F
t
865 S
q.F
t
865 S
q.F
t
865 S
q.F
t
997 S
q.F
t
997 S
q.F
t
1122 S
q.F
t
1122 S
q.F
t
1122 S
q.F
t
1122 S
q.F
t
1122 S
q.F
t
1122 S
q.F
t
1122 S
q.F
t
865 S
q.F
t
865 S
q.F
t
nico
lnicol thom
as
architects project m
anagers construction cost consultants C
DM
PR
OP
OS
ED
KE
RB
L
IN
E
FO
RM
ER
KE
RB
L
IN
E
LE
GE
ND
BA
NK
S
TA
BILIS
AT
IO
N
TO
S
.E
NG
IN
EE
RS
D
ET
AILS
BA
NK
S
TA
BILIS
AT
IO
N
TO
S
.E
NG
IN
EE
RS
D
ET
AILS
+176.50
Palings - 100x19 w
ith 25m
m gap
N.T
.S.
N.T
.S.
Alternate 25m
m gaps
100x100 tim
ber
or conc. posts at
2000 c/s.
75m
m gap betw
een bottom
of fence &
ground level
16000
300m
m H
igh gravel board
ALL N
EW
G
AT
ES
A
RE
T
O B
E LO
CK
AB
LE
AN
D G
IV
E 850M
M C
LE
AR
O
PE
NIN
G
RO
OF
:
Sla
te
G
re
y C
on
cre
te
tiles, M
arle
y M
od
ern
o
r sim
ila
r
ap
pro
ve
d
WA
LL
:
Ma
in
w
allin
g to
b
e re
d-m
ulti fa
cin
g b
rickw
ork w
ith
fe
atu
re
re
nd
ere
d p
an
els
WIN
DO
W:
Hig
h p
erfo
rm
an
ce
g
re
y p
vc-u
w
ith
d
ou
ble
gla
ze
d se
ale
d u
nits
RA
IN
WA
TE
R G
OO
DS
Bla
ck p
vc-u
.
SU
RF
AC
E T
RE
AT
ME
NT
S:
As d
eta
ile
d.
Ma
te
ria
l S
pe
cifica
tion
X
FF
L
174.50
1
PR
OP
OS
ED
S
TR
EE
TS
CA
PE
X
- X
TO
P O
F
HL G
AB
IO
N
177.00
TO
P O
F
LL G
AB
IO
N
176.50
RA
WT
EN
ST
AL
L
WH
IN
BE
RR
Y V
IE
W
PR
OP
OS
ED
R
ES
ID
EN
TIA
L D
EV
EL
OP
ME
NT
PR
OP
OS
ED
S
IT
E L
AY
OU
T
DO
N
OT
S
CA
LE
PR
EL
IM
IN
AR
Y
P4
10
1F
RA
23
7
IM
PE
RM
EA
BL
E A
RE
AS
P
LA
N
PO
ST
-D
EV
EL
OP
ME
NT
RA
WT
EN
ST
AL
L
WH
IN
BE
RR
Y V
IE
W
NO
TE
S
TOTAL SITE AREA - 7513m²
PR
OP
OS
ED
IM
PE
RM
EA
BLE
A
RE
A -
ROAD - 1932m²
ROOF - 1659m²
DRIVE - 900m²
TOTAL IMPERMEABLE AREA - 4491m² (60%)
P1
31.10.2013
CP
PR
ELIM
IN
AR
Y IS
SU
E F
OR
R
EV
IE
W R
DN
P2
10.07.2014
CP
UP
DA
TE
D T
O R
EF
LE
CT
R
EV
IS
ED
LA
YO
UT
R
DN
P3
14.07.2014
CP
UP
DA
TE
D T
O R
EF
LE
CT
C
HA
NG
ES
T
O LA
YO
UT
R
DN
P4
23.10.2014
CP
UP
DA
TE
D T
O R
EF
LE
CT
R
EV
IS
ED
B
OU
ND
AR
Y R
DN
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
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Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX K: SFRA INFORMATION
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Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX L: STORMWATER STORAGE ESTIMATES
This page has been left intentionally blank
STORMWATER STORAGE ESTIAMATES
FEH
FSR
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
This page has been left intentionally blank
Whinberry View, Rawtenstall Flood Risk Assessment
FRA237 ‐ Flood Risk Assessment
APPENDIX M: NOTES OF LIMITATION The data essentially comprised a study of available documented information from various sources together with discussions with relevant authorities and other interested parties. There may also be circumstances at the site that are not documented. The information reviewed is not exhaustive and has been accepted in good faith as providing representative and true data pertaining to site conditions. If additional information becomes available which might impact our l conclusions, we request the opportunity to review the information, reassess the potential concerns and modify our opinion if warranted. It should be noted that any risks identified in this report are perceived risks based on the available information. This report was prepared by Betts Associates Ltd for the sole and exclusive use of the titled client in response to particular instructions. Any other parties using the information contained in this report do so at their own risk and any duty of care to those parties is excluded. This document has been prepared for the titled project only and should any third party wish to use or rely upon the contents of the report, written approval from Betts Associates Ltd must be sought. Betts Associates Ltd accepts no responsibility or liability for the consequences of this document being used for the purpose other than that for which it was commissioned and for this document to any other party other than the person by whom it was commissioned.
