Land off Hurst Lane, Rossendale Flood Risk Statement
On behalf of
Project Ref: 29670/4001 | Rev: 00 | Date: September 2014
Office Address: 3rd Floor Waterloo House, Victoria Square, Birmingham B2 5TB T: +44 (0)121 633 2900 F: +44 (0)121 633 2901 E: [email protected] Flood Risk Statement Land off Hurst Lane
Document Control Sheet
Project Name: Land off Hurst Lane Project Ref: 29670/4001 Report Title: Flood Risk Statement Doc Ref: 29670/4001 Flood Risk Statement Date: September 2014
Name Position Signature Date
Hydrologist September Prepared by: L Chatterjee BSc (Hons) MSc 2014 MCIWEM Associate September Reviewed by: E Sharpe BEng (Hons), 2014 CEng, C.WEM Partner September Approved by: Paul Jenkin Beng (Hons), MSc, CEng, FCIWEM, 2014 C.WEM
For and on behalf of Peter Brett Associates LLP
Revision Date Description Prepared Reviewed Approved
Peter Brett Associates LLP disclaims any responsibility to the Client and others in respect of any matters outside the scope of this report. This report has been prepared with reasonable skill, care and diligence within the terms of the Contract with the Client and generally in accordance with the appropriate ACE Agreement and taking account of the manpower, resources, investigations and testing devoted to it by agreement with the Client. This report is confidential to the Client and Peter Brett Associates LLP accepts no responsibility of whatsoever nature to third parties to whom this report or any part thereof is made known. Any such party relies upon the report at their own risk.
© Peter Brett Associates LLP 2013
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Flood Risk Statement Land off Hurst Lane
Contents
1 EXECUTIVE SUMMARY ...... 1 2 INTRODUCTION ...... 2 3 PROPOSED DEVELOPMENT SITE ...... 3 3.1 SITE LOCATION ...... 3 3.2 SITE TOPOGRAPHY ...... 3 3.3 HYDROLOGICAL CONTEXT ...... 4 3.4 GEOLOGICAL CONTEXT ...... 4 3.5 EXISTING SITE DRAINAGE ...... 4 3.6 PROPOSED DEVELOPMENT ...... 4 4 ASSESSMENT OF FLOODING ...... 5 4.1 TIDAL FLOODING...... 5 4.2 FLUVIAL FLOODING ...... 5 4.3 RESERVOIR FLOODING ...... 6 4.4 GROUNDWATER FLOODING ...... 6 4.5 SURFACE WATER FLOODING ...... 6 4.6 FOUL WATER FLOODING ...... 7 4.7 FLOOD RISK TO THE SITE ...... 7 5 FLOOD MITIGATION STRATEGY ...... 8 5.1 PRINCIPLES FOR MITIGATION STRATEGY ...... 8 5.2 FINISHED FLOOR LEVELS ...... 8 5.3 FLOODPLAIN STORAGE COMPENSATION, ACCESS AND EGRESS ROUTES AND FLOOD WARNING ...... 8 6 SURFACE WATER MANAGEMENT ...... 9 6.1 EXISTING SURFACE WATER REGIME ...... 9 6.2 POTENTIAL IMPACT OF PROPOSED DEVELOPMENT ...... 9 6.3 PRINCIPLES FOR SURFACE WATER MANAGEMENT STRATEGY ...... 9 6.4 PROPOSED STRATEGY ...... 9 6.5 OTHER CONSIDERATIONS ...... 9 7 CONCLUSION ...... 11
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Flood Risk Statement Land off Hurst Lane
Figures
Figure 3.1 Site Location Plan ...... 3 Figure 4.1 Extract of EA Flood Map (dated 26 th June 2014) ...... 5 Figure 4.4 Extract of online EA Surface Water Flood Map (source: www.environment-agency.gov.uk accessed on 13 th August 2014) ...... 6
Appendices
Appendix A Topographic Survey Appendix B Masterplan Appendix C Stakeholder Correspondence Appendix D Surface Water Management Strategy
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Flood Risk Statement Land off Hurst Lane
1 EXECUTIVE SUMMARY
1.1.1 A residential development is proposed at land off Hurst Lane, Rossendale, Lancashire. The site is greenfield and covers an area of 0.12 ha. As such, a full Flood Risk Assessment isn’t required but to show that flood risk aspects of the site have been duly considered this Flood Risk Statement (FRS) has been prepared.
1.1.2 According to data supplied by the Environment Agency (EA) (correspondence dated 18 th March 2014) and a review of local flood risk studies, the site is located in Flood Zone 1 as defined in National Planning Policy Framework (NPPF) and the associated Planning Practice Guidance (PPG) Table 1. This is an area with a ‘Low Probability of Flooding’.
1.1.3 The proposals for residential development constitute a ‘More Vulnerable’ land use, as defined in PPG Table 2. According to PPG, this land use is suitable within Flood Zone 1.
1.1.4 There are no records of known flooding from any source within the site. The focus for this FRS is therefore upon managing surface water runoff from the new development to ensure no adverse impact elsewhere.
1.1.5 The existing site is greenfield and drains into a local watercourse or highways sewers. The proposed development will increase the impermeable surfacing across the site. The proposed surface water strategy will restrict the surface water run-off rate to existing greenfield run-off rates and comprises a SuDS scheme of attenuation features designed to accommodate surface water run-off in the 100yr plus 30% (climate change) storm event. Surface water run- off from the site will ultimately drain to a local water course to the west of the site.
1.1.6 The FRS confirms that the proposed development complies with NPPF and PPG with respect to flood risk and is an appropriate development at this location.
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Flood Risk Statement Land off Hurst Lane
2 INTRODUCTION
2.1.1 PBA has completed a Flood Risk Statement on behalf of Hurstwood Group in support of a planning application for a residential development at Land off Hurst Lane, Rossendale, Lancashire.
2.1.2 The FRA has been completed in accordance with the following policy and guidance:
° National Planning Policy Framework (NPPF), (2012)
° Planning Practice Guidance (PPG), (2014)
° Rossendale Borough Council: Core Strategy Development Plan Document: The Way Forward (2011-2026), (2011)
° Rossendale Borough Council: Level 1 Strategic Flood Risk Assessment (2009)
° Flood Risk Regulations 2009 – Preliminary Flood Risk Assessment: Lancashire Area Preliminary Appraisal Report (2011)
° River Irwell Catchment Flood Management Plan (2009)
2.1.3 In completing the FRS the following key stakeholders have been consulted:
° Environment Agency (EA)
° United Utilities (UU)
° Lancashire County Council (LCC)
° Rossendale Borough Council (RBC)
2.1.4 A NPPF Sequential Test for the site is not required as the site is located in Flood Zone 1, which is the zone with lowest probability of flooding. The NPPF Exception Test is not applicable for residential development in Flood Zone 1.
2.1.5 This FRS has been prepared in accordance with the NPPF and local planning policy. The flood management and surface water management strategies, including setting appropriate finished floor levels are based on the relevant British Standards (BS8533), the standing advice provided by the EA or based on common practice. The approach for the FRA and proposals for the surface water management strategy are based on the requirements of the EA, Rossendale Borough Council and Lancashire County Council, in their role as Lead Local Flood Authority.
2.1.6 However, it should be noted that the insurance market applies different tests to properties in relation to both determining premiums and, more fundamentally, determining the insurability of properties for flood risk. Those undertaking development in areas which may be at risk of flooding are advised to contact their insurers or the Association of British Insurers (ABI) to seek further guidance prior to commencing development.
2.1.7 The findings of this FRS are based on data available at the time of the study and on the assessment that has been undertaken to date. They relate to the current development proposals as outlined in section 3.6 . PBA do not warrant that the advice in this report will guarantee the availability of flood insurance either now or in the future.
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Flood Risk Statement Land off Hurst Lane
3 PROPOSED DEVELOPMENT SITE
3.1 SITE LOCATION
3.1.1 The site is located at grid reference (NGR) 379733 (N) 422707 (E). The red line boundary covers approximately 0.12 hectares in area, and is shown in the site location plan in Figure 3.1 .
3.1.2 The site is greenfield and located off of Hurst Lane, between the towns of Haslingden and Rawtenstall. It is bordered to the north by an unnamed road, to the west by open grassland and Hurst Lane and to the south and east by residential areas.
Unnamed road
Site Boundary Contains Ordnance Survey data © Crown Copyright and database right 2014
Note: OS Map still shows the now demolished Rossendale General Hospital
Figure 3.1 Site Location Plan
3.2 SITE TOPOGRAPHY
3.2.1 A topographical survey of the site was undertaken by Paragon Surveys in April 2013 and provides level data to OSGPS datum. A copy of the topographical survey is provided in Appendix A (drawing number PS-0848-TS).
3.2.2 Ground levels slope down towards the southern site boundary. The high point within the site is along the northern boundary of the site towards the north-western corner where ground levels are approximately 204mAOD. The low point within the site is within the south-eastern corner where ground levels are approximately 202.4mAOD.
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Flood Risk Statement Land off Hurst Lane
3.3 HYDROLOGICAL CONTEXT
3.3.1 OS mapping indicates that the nearest Main River is Balladen Clough that flows in a south- westerly direction approximately 100m south of the site.
3.3.2 Site observations indicate that there is an ordinary watercourse running in a southerly direction approximately 50m west of the site, to the west of the Hurst Lane.
3.4 GEOLOGICAL CONTEXT
3.4.1 Online mapping from the British Geological Survey (1:50,000 maps) shows the site is underlain by a bedrock geology of both Mudstone and Siltstone from the Rossendale Formation and Brooksbottom Sandstones, both part of the Millstone Grit Group. Both are classified as Secondary A Aquifer and therefore capable of supporting water supplies locally and supporting base flows to rivers. This is overlain by superficial Till, Devensian – Diamicton deposits which are classed as unproductive strata, which are rock layers or drift deposits with low permeability that have a negligible significance for water supply or river base flow.
3.4.2 The site is not located in an EA Groundwater Source Protection Zone (SPZ).
3.5 EXISTING SITE DRAINAGE
3.5.1 The site is greenfield and from a review of topographical survey data and site observations it is apparent that surface water run-off currently drains towards the southern boundary of the site. Due to the topography, the western part of the site drains to the west and discharges into a highways drain in Hurst Lane. The eastern part of the site drains to the east to a low point just beyond the south-eastern corner of the site. It then drains as overland flow to the south.
3.5.2 Further details about the existing surface water regime are covered in section 6.1 .
3.5.3 Review of UU water asset plans confirms that there are no public surface water sewers in the immediate vicinity of the site. Site observations found that there are highways gullies within Hurst Lane, approximately 30m south-west of the site.
3.6 PROPOSED DEVELOPMENT
3.6.1 The development proposals are for 3 dwellings and associated infrastructure. A copy of the masterplan (drawing number HH/HL/SL/01) is included in Appendix B .
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Flood Risk Statement Land off Hurst Lane
4 ASSESSMENT OF FLOODING
4.1 TIDAL FLOODING
4.1.1 The site is located inland and, as such, is not affected by either tidal or coastal flooding.
4.2 FLUVIAL FLOODING
4.2.1 Figure 4.1 shows an extract of the Flood Map supplied by the EA in correspondence dated 26 th June 2013 (confirmed as up to date in correspondence dated 18 th March 2014).
© Environment Agency copyright and / or database rights 2012. All rights reserved. © Crown Copyright and database right 2012. Ordnance Survey licence number 100024198.
Figure 4.1 Extract of EA Flood Map (dated 26 th June 2014)
4.2.2 The EA Flood Map confirms that the site is at a very low probability of flooding and is located in Flood Zone 1. A copy of the full response from the EA is included in Appendix C .
4.2.3 According to stakeholder consultation responses and a review of the PFRA and SFRA, there are no known incidences of historic fluvial flooding within the site. The PFRA and SFRA indicate that there are incidences of historical fluvial flooding in the wider Rossendale Valley but the information provided does not include specific references of locations in the immediate vicinity of the site.
4.2.4 In correspondence dated 18 th March 2014, the EA confirm that they do not hold any records of flooding in the vicinity of the site.
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Flood Risk Statement Land off Hurst Lane
4.3 RESERVOIR FLOODING
4.3.1 Online EA mapping and correspondence with the EA (dated 22 nd April 2013) indicates that the site is not at risk of reservoir flooding at the site or surrounding area.
4.4 GROUNDWATER FLOODING
4.4.1 The PFRA and Level 1 SFRA state that there are no historical incidences of groundwater flooding at the site or surrounding area.
4.5 SURFACE WATER FLOODING
4.5.1 The Level 1 SFRA and PFRA indicate that there are incidences of surface water flooding in the Rossendale Valley but the information does not include specific incidences of flooding
4.5.2 Figure 4.4 contains an extract of the online EA Surface Water Flood Map. These maps are of a coarse nature and identify low lying areas of topography that may be more susceptible to surface water flooding. The surface water flood map indicates that the site is at a very low risk of surface water flooding.
Spring
Site Boundary
Figure 4.4 Extract of online EA Surface Water Flood Map (source: www.environment-agency.gov.uk accessed on 13 th August 2014)
4.5.3 The area to the north of the site (on the oppose side of the unnamed road) is relatively flat and then rises steeply. Online EA mapping (including the Surface Water Flood Map shown in Figure 4.4 above) indicates that the area north of the site drains to a spring, located approximately 100m north of the site, which then flows west and joins with the ordinary watercourse that flows down Hurst Lane, approximately 50m west of the site. Any additional surface water runoff that may flow towards the site from the land to the north is captured in the highways gutters along the unnamed road that runs along the northern boundary of the site, which then drains into highways drainage in Hurst Lane.
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Flood Risk Statement Land off Hurst Lane
4.5.4 The site does not currently drain via a formal drainage system. Therefore the proposed development and implementation of a surface water management strategy will enable overland flow to be directed and managed in a controlled manner.
4.6 FOUL WATER FLOODING
4.6.1 Review of UU asset plans confirms that there are no foul sewers in the vicinity of the site. A copy of the asset plans is included in Appendix C .
4.6.2 The SFRA includes information from UU’s Director General 5 (DG5) register of sewer flooding and shows that in the Rawtenstall-Bacup area there have been five incidences of internal (within property) flooding from sewers and one incidence of external (not within property) flooding. However, incidences are recorded per postcode and, as such, the information is not appropriate for a site specific assessment.
4.7 FLOOD RISK TO THE SITE
4.7.1 Based on the review of data relating to potential sources of flooding at the site, it is confirmed that the site has a low or very low potential of flooding. No further assessment of flood risk at the site has been completed.
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Flood Risk Statement Land off Hurst Lane
5 FLOOD MITIGATION STRATEGY
5.1 PRINCIPLES FOR MITIGATION STRATEGY
5.1.1 According to the stakeholder consultation and guidance documents referenced in Section 2 , flood mitigation measures should ensure:
° finished floor levels to be set at least 600mm above the 1 in 100 year (plus climate change) flood level; and
° dry access and egress routes to be provided during a flood event.
5.2 FINISHED FLOOR LEVELS
5.2.1 There is no floodplain within the site and, therefore, all built development will be located outside the floodplain and on higher ground.
5.2.2 It is recommended that floor levels are located above surrounding ground levels, in accordance with best practice and Building Regulations, in order to reduce any residual risk of internal flooding during extreme events.
5.3 FLOODPLAIN STORAGE COMPENSATION, ACCESS AND EGRESS ROUTES AND FLOOD WARNING
5.3.1 As the built development and the access routes into the development will be located in Flood Zone 1, there is no requirement to provide any floodplain storage compensation or to consider access routes or flood warnings any further.
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Flood Risk Statement Land off Hurst Lane
6 SURFACE WATER MANAGEMENT
6.1 EXISTING SURFACE WATER REGIME
6.1.1 The existing site is greenfield and topographic survey data and site observations indicate that surface water currently drains towards the southern boundary of the site. The western part of the site drains to the west and discharges into a highways drain in Hurst Lane. The eastern part of the site drains to the east to a low point just beyond the south-eastern corner of the site.
6.2 POTENTIAL IMPACT OF PROPOSED DEVELOPMENT
6.2.1 The proposed development will increase the area of impermeable surfacing within the site which could affect flows in the receiving systems and, therefore, flood risk elsewhere. However, as the area of impermeable surfacing is small there will be limited impact on flood risk both in the receiving systems and areas downstream.
6.2.2 A suitable strategy for the management of surface water run-off from the proposed development has been prepared to ensure flood risk to the site and wider area is not increased.
6.3 PRINCIPLES FOR SURFACE WATER MANAGEMENT STRATEGY
6.3.1 The proposals are for the surface water drainage from the site to be discharged to the watercourse which is located to the west of Hurst Lane.
6.4 PROPOSED STRATEGY
6.4.1 The total impermeable area is approximately 740m2 as shown on the illustrative masterplan (drawing number HH/HL/SL/01 in Appendix B ).
6.4.2 Due to local geology there is very limited potential for infiltration to groundwater. Therefore the surface water strategy for the development is to discharge surface water at greenfield run- off rates to the watercourse to the west of Hurst Lane.
6.4.3 Storage will be provided beneath permeable paved areas within the site to ensure that peak flow rates are attenuated to greenfield run-off rates. The potential for these storage features to drain some water to groundwater via infiltration will be investigated at the detailed design stage.
6.4.4 Drawing 29670-4001-001 in Appendix D shows the indicative masterplan and highlighted surface water drainage features.
6.5 OTHER CONSIDERATIONS
Pollution Control
6.5.1 The residential nature of the development means that the potential for contamination is low. However, pollution control measures will be included in the surface water strategy to minimise the risk of contamination or pollution entering the receiving water bodies from surface water runoff from the development.
6.5.2 The drainage system will therefore be designed to comply with the requirements of the SuDS treatment train as laid out by CIRIA 697 ‘The SUDS Manual’.
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Flood Risk Statement Land off Hurst Lane
6.5.3 The final strategy for pollution control will be confirmed as part of the detailed design.
Adoption and Management
6.5.4 Until the SAB comes into force, adoption and maintenance of SuDS features within the site will need to be undertaken by an appropriate management company.
6.5.5 Any piped drains or sewers serving more than one property can be designed and constructed such that they can be adopted by UU. Due to the size of the development, it is assumed that all other drainage will be maintained by the individual property freeholders.
6.5.6 If the final drainage design includes a shared area of permeable paving or below ground storage it may be necessary for adoption and maintenance to be undertaken by an appropriate management company.
6.5.7 The final strategy for adoption and management will be confirmed as part of the detailed design.
Exceedence
6.5.8 The piped system will be designed to accommodate runoff during storm events up to the 1 in 30 year event. For more extreme events up to the 1 in 100 year storm event with an allowance for the impact of climate change it is possible that the design standard for the system will be exceeded.
6.5.9 The final scheme will consider the consequences of such an event. If a more extreme event occurs and the design standard for the system is exceeded, ground levels and plot levels will be designed such that surface water runoff is directed away from both existing and proposed properties, firstly flowing towards surface water storage in permeable paved areas. From there, exceedance flows will flow south and westwards towards Hurst Lane.
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Flood Risk Statement Land off Hurst Lane
7 CONCLUSION
7.1.1 This FRS has been completed for the proposed residential development at Land off Hurst Lane and concludes that:
° The site is located in Flood Zone 1 and is at a low risk of flooding from all sources.
° The proposed development (residential use) would be categorised as "More Vulnerable" and, within the context of the PPG, Table 3, Flood Risk Vulnerability and Flood Zone "Compatibility", would be considered appropriate from a flood risk perspective.
° Topographical survey indicates that the majority of the site drains via overland flow towards the southern boundary of the site and thereafter towards highways drainage in Hurst Lane and to a low point east of the site.
° At this stage, a preliminary indicative surface water management strategy has been developed based upon the provision of storage beneath permeable paved areas.
° The surface water management system will be designed to accommodate runoff for events up to the 1 in 100 years (plus a 30% allowance for climate change) with runoff rates restricted to existing greenfield runoff rates.
° The final strategy is to be determined and agreed with RBC and EA but at this stage it is anticipated to comprise a combination of source control SuDS and storage beneath permeable paving.
° In conclusion, the proposed scheme complies with NPPF with respect to flood risk and is an appropriate development at this location.
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Flood Risk Statement Land off Hurst Lane
Appendix A Topographic Survey
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Flood Risk Statement Land off Hurst Lane
Appendix B Masterplan
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Flood Risk Statement Land off Hurst Lane
Appendix C Stakeholder Correspondence
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Lisa Chatterjee
From: NW Info Requests
Dear Lisa
Request for information under the Freedom of Information Act 2000 (FOIA) / Environmental Information Regulations 2004 (EIR)
Thank you for your enquiry regarding flood data for Rossendale.
Our Flood Defence team have confirmed that the data we sent in April last year represents the most up to date we have.
I hope that we have correctly interpreted your request.
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Contact: [email protected] 03708 506506
16/04/2013 NTH7413C
5 % AEP (1 in 20 10 % AEP (1 in 10 1.33 % AEP (1 in 75 1 % AEP (1 in 100 0.1 % AEP (1 in Map Reference Model Node Reference Easting Northing Data year) year) year) year) 1000 year)
Modelled Water Level (m aod) 165.74 165.64 165.93 166.21 166.86 1 ea0140LIMY01_0305u 381162 422900 Modelled Flow (cumecs) 17.99 15.58 22.95 28.73 33.61 Modelled Water Level (m aod) 170.11 169.96 170.55 170.81 171 2 ea0140LIMY01_0508u 381184 423104 Modelled Flow (cumecs) 17.59 15.24 22.42 25.58 27.91 Modelled Water Level (m aod) 170.66 170.48 171.07 171.34 171.54 3 ea0140LIMY01_0548u 381212 423140 Modelled Flow (cumecs) 17.47 15.13 22.59 27.82 32.54 Modelled Water Level (m aod) 170.89 170.71 171.4 171.92 172.37 4 ea0140LIMY01_0600u 381240 423172 Modelled Flow (cumecs) 17.41 15.08 22.52 27.71 32.28
Model data taken from River Irwell and Limy Water 2011 Study
Notes:
AEP - Annual Exceedence Probability m aod - metres above ordnance datum cumecs - cubic metres per second
*Climate Change Scenario - 20% increase in flow Basic map centred on Limy Water, Rawntenstall. Created on 16th April 2013 [Ref. PRRWAR7413C]
Scale 1:10,000 ¯
Legend (! Site Location )" Model_Measurements Main River 4 OK (! )" RO 3 B Flood Zone 3 )" OD 2 O Flood Zone 2 )" GW AN /L EN AD LL BA )"1
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© Environment Agency copyright and / or database rights 2013. All rights reserved. © Crown Copyright and database right. All rights reserved. Environment Agency, 100026380, 2013. Contact Us: National Customer Contact Centre, PO Box 544, Rotherham, S60 1BY. Tel: 08708 506 506 (Mon-Fri 8-6). Email: [email protected] Receipt Number: NTH7413C VAT Registration Number: GB 662 4901 34
Date: 16/04/13 Remittance Details: Credit/Debit card £ 60.00 Environment Agency Reference: NTH7413 Cheque £
Customer Name and Address: Mr Andrew Eden / Miss Goergina Roseff Cash £ Peter Brett LLP 3rd floor Waterloo House, Victoria Square Birmingham, B2 5TB Postal Order £ Accepted by: Stephen Matthews
Breakdown of Charges: Net Amount Received Licence : £50.00 £50.00 VAT : £10 Total: £60.00 VAT (if applicable) If not applicable write NONE £ 10.00
Total amount received £ 60.00
Environment Agency Income Department 311, PO Box 263, Peterborough, PE2 8YD E-mail [email protected] DX140501 Peterborough 13 Tel 0845 6031043, Fax 01733 464923, GTN 7-50 X 1000 Lisa Chatterjee
From: Matthews, Stephen C
Dear Anthony,
PUBLIC REGISTER AND ENVIRONMENTAL INFORMATION REQUEST
Multiple sites in Rossendale
Thank you for your email regarding the above site. Requests for recorded information are generally governed by the Freedom of Information Act 2000 (FOIA).The information you have requested is environmental and is therefore exempt from the provisions of FOIA by FOIA s.39(1). We have therefore considered you r request under the Environmental Information Regulations 2004 (EIR). Apologies for the delay in responding to this request. Please find our FULL response below.
Your Enquiry You initially requested flood risk information on five separate sites in the R ossendale area. After discussing what information we had available, you requested information relating to the modelled flood levels at Limy Water only.
You requested the following information:
1) A detailed flood map to include the floodplains for the 1:20, 1:100 (fluvial) and 1:1000 year floodplains (fluvial & tidal) with and without climate change and any other available return periods.
2) Details of any historic flooding in the vicinity
3) Details of local hydraulic features/controls and hydrological influenc es that should be considered when undertaking a flood risk assessment.
4) Confirmation of EA recommendations for mitigation measures including setting finished floor levels, flood warning and access arrangements.
5) Details of existing reservoirs in the vicinity of the site
6) Details of groundwater source protection zones and nature of groundwater flow in the vicinity of the site.
7) Details of any known groundwater flooding issues.
8) Details of any known surface water flooding at or nearby the site
9) Details of any known capacity issues in the local highways drainage surface water sewer systems in the vicinity of the site.
1 10) Details of any specific EA requirements with respect to the management of surface water runoff should the site be taken forward for development.
Our response 1) Please see the attached flood map and accompanying table showing the 1:20, 1:100, 1:1000 levels.
2) We do not hold any records of historic flooding in this area.
3) We are not aware of any local hydraulic features/controls or hydrological influences which would need to be considered for a flood risk assessment.
4) We generally recommend a minimum floor level of 600mm above the 100year plus climate change level. In addition to that we would always recommend that the access and egress routes remain dry during a flood event to allow safe entry and escape from the property in such an event. We have a number of flood warning areas which are published on our website, we recommend that the developers investigates if the site is within a flood warning area and signs up for alerts if relevant.
5) We are not aware of any existing reservoirs in the vicinity of this site.
6) We do not have any groundwater level monitoring sites within the vicinity of this site. We only monitor groundwater levels in the Principal Aquifer which is the Permo-Triassic Sandstone. The geology of this area is the Millstone Grit Group overlain by Till, Alluvium and Glacial deposits. The Millstone Grit Group is a Secondary A aquifer. Secondary A aquifers are permeable layers capable of supporting water supplies at a local rather than strategic scale, and in some cases forming an important source of base flow to rivers. Till, Alluvium and Glacial deposits are Unproductive Strata, these are rock layers or drift deposits with low permeability that have a negligible significance for water supply or river base flow.
This location is not in a Source Protection Zone, you can find out more information on Groundwater on our ‘What’s in your backyard?’ pages at http://www.environment- agency.gov.uk/homeandleisure/37793.aspx
7) We do not hold information on groundwater flooding, this information is held by the Lead Local Flood Authority.
Local authorities search: http://www.gov.uk/find-your-local-council Local authorities – new roles and responsibilities http://www.defra.gov.uk/environment/flooding/legislation/a-roles/
8) Please see the attached letter regarding surface water flooding.
9) We are not aware of any capacity issues relating to the local highways drainage water sewer systems in relation to this site.
10) We recommend that an FRA be undertaken which fully addresses any surface water flooding issues including taking into account drainage recommendations outlined in the relevant Strategic Flood Risk Assessment (held by the local authority). The FRA should follow the recommendations in the National Planning Policy Document, further information can also be found in the Planning Policy Statement 25 regarding flood risk.
Rights of appeal We hope that our response has addressed all of the questions that you have asked. However, if you are not satisfied with our response to your request for information, you can contact us to ask for our decision to be reviewed. If you are still not satisfied following this, you can make an appeal to the Information Commissioner, who is the statutory regulator for Freedom of Information. Their contact details are: Office of the Information Commissioner, Wycliffe House, Water Lane, Wilmslow, Cheshire SK9 5AF . Tel: 01625 545700. Fax: 01625 524 510 2 email: [email protected] . Website: http//www.ico.gov.uk
Stephen Matthews Customer Services Officer Customer Services Team North West - North Area, Preston Office