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Flood Risk Assessment Report

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Flood Risk Assessment Report Report No. 724/01r2 FLOOD RISK ASSESSMENT REPORT AT S O U T H P A R K M I L L S P U D S E Y ON BEHALF OF A C R I V A R N L T D OCTOBER 2013 ARP ASSOCIATES CHARTERED CONSULTING ENGINEER Northwest House • 5/6 Northwest Business Park • Servia Hill • Leeds LS6 2QH Telephone: 0113 2458498 • Fax: 0113 2443864 email: [email protected] • www.arpassociates.co.uk C O N T E N T S Page 1.0 Introduction 3 2.0 Walkover Survey General 2.1 - 2.3 4 Current Use 2.4 - 2.5 4 Boundaries 2.6 5 Topography and Vegetation 2.7 5 Drainage 2.8 - 2.9 5 3.0 Environment Agency Consultation 6 4.0 Water Authority Consultation 7 5.0 Land Drainage Authority Consultation 8 6.0 Material Consideration in Respect of NPPF and TG Flood Classification 6.1 - 6.2 9 End Use 6.3 - 6.4 9 Sequential Test 6.5 - 6.6 9 Flood Sources 6.7 - 6.13 10 - 11 Climate Change 6.14 - 6.16 11 Flood Mitigation 6.17 12 Sustainable Drainage 6.18 - 6.19 12 - 13 Drainage 6.20 13 Existing Surface Water Run-off 6.21 13 Proposed Surface Water Drainage 6.22 13 - 14 Foul Drainage 6.23 14 Emergency Egress in Times of Flood 6.24 - 6.25 14 7.0 Comment 15 - 16 APPENDICES Appendix A Site Location Plan Appendix B Environment Agency Consultation Appendix C Water Authority Consultation Appendix D Land Drainage Authority Consultation Appendix E Proposed Development Layout Appendix F Indicative Surface Water Drainage Calculations 2 ARP ASSOCIATES – 724/01r2 OCTOBER 2013 1.0 INTRODUCTION 1.1 Acrivarn Ltd are considering sale of South Park Mills off Hare Lane, Pudsey with a view to redevelopment for residential properties. It was considered appropriate for a Flood Risk Assessment Report to be prepared on the site to supplement any Planning Application for the proposed development. 1.2 It is within the general development strategy of the country for development in areas where there is a risk of flooding to be assessed to avoid unnecessary increase in the requirement for flood defence. Under the National Planning Policy Framework (NPPF) and the accompanying Technical Guidance (TG), consultation is required with the Environment Agency, Land Drainage Authority and Water Authority and a Flood Risk Assessment Report should be prepared considering the development proposals and make recommendations for any flood mitigation measures. 1.3 ARP Associates have been appointed by to carry out an assessment of the site, implement appropriate consultations and prepare a Flood Risk Assessment Report, in accordance with NPPF, to satisfy the requirements of the Planning Authority. 1.4 The consultations and walkover survey have been carried out in October 2013. 1.5 This assessment has been prepared for the sole use and reliance of the Client and shall not be relied upon or transferred to any other parties without the written authorisation of ARP Associates. No responsibility will be accepted where this report is used, either in its entirety or in part, by any other party. 3 ARP ASSOCIATES – 724/01r2 OCTOBER 2013 2.0 WALKOVER SURVEY General 2.1 The site is located at Ordnance Survey Grid Reference SE226 316 and is approximately 1.5km to the south of the centre of Pudsey and 7km to the West of Leeds City centre. The site is basically rectangular and extends to an area of approximately 1.5 hectares. 2.2 The site is located at the bottom of the steeply sloping Hare Lane from the South side of Pudsey. At the end of Hare Lane, the road bends into the site with South Park Terrace residential housing on the northeastern corner. There is no obvious positive drainage system within Hare Lane and, during times of heavy storm, water is anticipated to run down the steep slope and into the site. 2.3 A site location plan is presented in Appendix A. Current Use 2.4 The site is occupied by a series of buildings and hardstanding areas across the majority of the site and this has positive drainage systems with gutters, downpipes and, what appears to be, an underground positive system. Manholes are present on the site for foul drainage from the South Park Terrace residential houses and the site buildings and connecting to a sewer, which runs across the Southern part of the site, and for surface water drainage which will connect to watercourse. 2.5 The most Easterly part of the site is rough grassland, whilst a former building on the Southern area has been partially demolished in the past leaving this an open flat area on the lower part of the site. 4 ARP ASSOCIATES – 724/01r2 OCTOBER 2013 Boundaries 2.6 The boundaries on the north, east and west of the site are formed by hedgerows and trees with a timber post and rail fence beyond. The southern boundary abuts Pudsey Beck which is flowing in a west to east direction. It appears that a public footpath may be present between the site boundary and the Beck. Topography and Vegetation 2.7 The site falls relatively steeply from the northern boundary to the southern boundary, although the area adjacent to the Beck is flat. Drainage 2.8 Surface water run-off from the site and the northern hard paved road area of Hare Lane will discharge into Pudsey Beck adjacent to the southern boundary of the site via a positive drainage system. It is also known that there are some tanks on the site which are adjacent to the Beck, and it is probable that these collected water in the past and allowed discharge directly into the watercourse. 2.9 Pudsey Beck is of rectangular section of varying width, but generally around 1.9m deep adjacent to the site. 5 ARP ASSOCIATES – 724/01r2 OCTOBER 2013 3.0 ENVIRONMENT AGENCY CONSULTATION 3.1 A consultation was requested from the Environment Agency and a copy of their response, reference RFI/2013/27259 dated 8 th October 2013, is presented in Appendix B for reference purposes. 3.2 The Environment Agency have confirmed that this site is generally within Flood Zone 1, apart from the area immediately adjacent to Pudsey Beck, which is classified as Flood Zone 3 (high risk) on the Environment Agency Flood Map. Therefore, a sequential approach to the development layout should avoid this area in favour of the Flood Zone 1 area (low risk). 3.3 Surface water shall be managed in accordance with the Leeds City Council "Minimum Development Control Standards for Flood Risk". 6 ARP ASSOCIATES – 724/01r2 OCTOBER 2013 4.0 YORKSHIRE WATER CONSULTATION 4.1 A consultation was requested from Yorkshire Water, and a copy of their response, reference P014711, dated 22 nd October 2013, is presented in Appendix C for reference purposes. 4.2 Yorkshire Water confirms that there is a 152mm diameter foul and a 450mm combined public sewer crossing the site. No buildings are to be erected within 3m, and no trees planted within 5m of the public sewers. Any diversion would need to be under Section 185 of the Water Industry Act 1991, subject to an application in writing. 4.3 Foul water can discharge to the 450mm diameter public combined sewer crossing the site. 4.4 In respect of surface water, Yorkshire Water refer to Sustainable Drainage Systems and Requirement H3 of Building Regulations 2000. 4.5 The local public sewers do not have capacity to accept any surface water discharge from the development, and Yorkshire Water advise contact with the Environment Agency/Land Drainage Authority with a view to establishing a suitable watercourse for discharge. 7 ARP ASSOCIATES – 724/01r2 OCTOBER 2013 5.0 EXISTING AND PROPOSED SURFACE WATER RUN-OFF 5.1 A consultation was requested from Leeds City Council, as Land Drainage Authority, and a copy of their e-mail response, dated the 7 th October 2013, is presented in Appendix D for reference purposes. 5.2 The site is bounded by Pudsey Beck and the 1 in 100 year flood plain extends into the southerly section of the site. If development is to be located within Flood Zone 3, then some flood compensation may be required, depending upon the type of development and its impact on the extent of the flood plain. 5.3 There are no records of flooding on the site or the surrounding areas. However, flooding of Pudsey Beck in the vicinity of Union Bridge Mills, downstream has occurred due to the blockage of the watercourse from fallen trees and debris. 5.4 There are other open watercourses to the northern and northwestern boundary of the site, but Leeds City Council has no records of connectivity to Pudsey Beck. 5.5 The drainage of the site should be in accordance with Leeds City Council "Minimum Development Control Standards for Flood Risk", which show that existing/proven surface water outfalls to Pudsey Beck would continue to discharge to the watercourse, but at reduced rates. If there is no connection to the watercourse at the present time, then greenfield rates of discharge may be necessary to allow connection to the watercourse. 8 ARP ASSOCIATES – 724/01r2 OCTOBER 2013 6.0 MATERIAL CONSIDERATION IN RESPECT OF NPPF AND TG Flood Classification 6.1 The Environment Agency and the Land Drainage Authority consultations show that the majority of site falls within land assessed as having less than a 1 in 1000 annual probability of river or sea flooding in any year (less than 0.1%).
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