Flood Investigation Report Market Weighton Flooding Event on 20 July 2014 CES\188b December 2014 Flood Investigation Report Market Weighton Flooding Event on 20 July 2014 Page | 1 CES\D188b Flood Investigation Report Market Weighton Flooding Event on 20 July 2014 Revision Schedule East Riding of Yorkshire Council Flood Investigation Report Market Weighton Flooding Event on 20 July 2014. Rev Date Details Author Checked and Approved By Rev 1 24/10/14 Initial Draft AM Rev 2 11/11/14 Draft reviewed by DW RL AM/DW Rev 3 17/11/14 Version for first publication DW CMT Rev 4 Rev 5 Rev 6 Rev 7 Page | 2 CES\D188b Flood Investigation Report Market Weighton Flooding Event on 20 July 2014 Copyright Notice Maps in this report are reproduced from Ordnance Survey material with the permission of Ordnance Survey on behalf of Her Majesty’s Stationery Office Crown copyright 2008. Unauthorised reproduction infringes Crown copyright and may lead to prosecution or civil proceedings. East Riding of Yorkshire Council 100023383. Records of the public sewer system included are a facsimile of the statutory record provided by Yorkshire Water Services. For the purposes of this report minor sewers and other non- relevant data have been omitted from the plans for clarity. The statutory public sewer record is held by Yorkshire Water Services Ltd. Acknowledgements East Riding of Yorkshire Council would like to thank the following for their co-operation and assistance throughout this investigation. Environment Agency Yorkshire Water Services Ltd Market Weighton Town Council Page | 3 CES\D188b Flood Investigation Report Market Weighton Flooding Event on 20 July 2014 Contents 1 Executive Summary ......................................................................................................................... 8 2 Location of Flooding ........................................................................................................................ 9 2.1 The Areas Affected .................................................................................................................. 9 2.2 The Flood Route .................................................................................................................... 10 3 Drainage System ........................................................................................................................... 11 3.1 Environment Agency - Watercourses ................................................................................... 11 3.1.1 The Mill Beck Spillway ................................................................................................... 11 3.1.2 Weighton Beck .............................................................................................................. 11 3.3 East Riding of Yorkshire Council –LLFA and Highway Drainage ............................................ 12 3.3.1 Highway Drainage ............................................................................................................ 12 3.4 Yorkshire Water Services - Sewer System............................................................................. 12 3.5 Flooding History .................................................................................................................... 12 3.5.1 Investment in Flood Alleviation Measures ................................................................... 13 4 The Flooding Event ........................................................................................................................ 14 4.1 Weather Data ........................................................................................................................ 14 4.2 Forecast ................................................................................................................................. 14 4.3 Flood Warning System - Details ............................................................................................ 14 4.3.1 Severe Weather Warnings ............................................................................................ 14 4.4 Reports .................................................................................................................................. 15 4.5 The Response ........................................................................................................................ 16 5 The Effects ..................................................................................................................................... 17 6 The Recovery ................................................................................................................................. 17 7 Causes and Investigation Findings ................................................................................................ 18 8 Conclusions ................................................................................................................................... 19 9 Recommendations ........................................................................................................................ 20 9.1 Recommendation 1 ............................................................................................................... 20 9.2 Recommendation 2 ............................................................................................................... 20 9.3 Recommendation 3 ............................................................................................................... 20 Abbreviations and Acronyms ................................................................................................................ 21 Glossary ................................................................................................................................................. 22 Appendix 1: Plan showing reported affected areas .............................................................................. 24 Appendix 2: Properties and Areas Affected .......................................................................................... 25 Page | 4 CES\D188b Flood Investigation Report Market Weighton Flooding Event on 20 July 2014 Appendix 2a: Surface Water Flow Routes ............................................................................................ 27 Appendix 3: Rainfall data ...................................................................................................................... 28 Appendix 4: Flood and Weather Warnings ........................................................................................... 30 Appendix 5: Yorkshire Water Services Response ................................................................................. 33 Appendix 6: The EA Flood Map for Market Weighton .......................................................................... 35 Appendix 7: Photographs ...................................................................................................................... 36 Appendix 8: Flood resilience information for property owners ........................................................... 44 Appendix 9: Useful Links and Contact Details: ..................................................................................... 45 Page | 5 CES\D188b Flood Investigation Report Market Weighton Flooding Event on 20 July 2014 Lead Local Flood Authority and Responsibilities East Riding of Yorkshire Council, as the Lead Local Flood Authority (LLFA), has a responsibility under Section 19 of the Flood and Water Management Act 2010 to investigate significant flood incidents in its area. Section 19 states: (1) On becoming aware of a flood in its area, a lead local flood authority must, to the extent that it considers it necessary or appropriate, investigate - (a) Which risk management authorities have relevant flood risk management functions, and (b) Whether each of those risk management authorities has exercised, or is proposing to exercise, those functions in response to the flood. (2) Where an authority carries out an investigation under subsection (1) it must - (a) Publish the results of its investigation, and (b) Notify any relevant risk management authorities. (3) The LLFA has lead responsibility for managing the risk of flooding from surface water, groundwater and ordinary water courses. This report has been prepared by East Riding of Yorkshire Council in its role as LLFA in response to extensive flooding which affected properties in Market Weighton and Shiptonthorpe. This report provides an overview of flooding that has occurred, describes the conditions which led to the flooding, considers the response to the flooding thus far and makes technical recommendations for the flood risk authorities concerned. Page | 6 CES\D188b Flood Investigation Report Market Weighton Flooding Event on 20 July 2014 Relevant Flood Risk Management Authorities The risk management authorities that have relevant flood risk management functions are: East Riding of Yorkshire Council East Riding of Yorkshire Council is the Lead Local Flood Authority responsible for managing flood risk from surface runoff, groundwater and ordinary watercourses, development of a Local Flood Risk Strategy, Asset Plans and Investigations under the Flood and Water Management Act 2010. East Riding of Yorkshire Council also has responsibility for some Coastal erosion risk management, and is the Highway Authority with responsibility for highway drainage under the Highways Act 1980. Environment Agency Responsible for managing the flood risk from main rivers, the sea and reservoirs including