Revision Schedule
Total Page：16
File Type：pdf, Size：1020Kb
Flood Investigation Report- Burton Fleming Winter 2012 / 2013 Revision Schedule East Riding of Yorkshire Council Flood Investigation Report Burton Fleming Winter 2012 / 2013 CES\D775\LDES\**** **/**/**** Rev Date Details Author Checked and Approved By 0.2 01/10/13 Initial Draft PCT 0.3 11/10/13 Revised Draft GP/AMM CES\D775\Burton Fleming Page 1 Flood Investigation Report- Burton Fleming Winter 2012 / 2013 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. Mr Keith Wells, Chair of Burton Fleming Parish Council, assisted throughout and acted as liaison between emergency services / East Riding of Yorkshire Council and residents. His input was vital to the whole recovery process. Burton Fleming Parish Council. For use of the Village Hall facilities throughout, enabling ERYC/HFRS/Police/ residents to hold meetings and provide shelter and cooking facilities for crews working on site. St Cuthbert’s Church and the local vicar, Revd Barbara Hodgson, for facilitating public meetings. Mr Robert Linley for the use of his farm as storage of pumps and sandbags and also for assistance with sandbag removal. Mr Steve Bramble for allowing East Riding of Yorkshire Council to set up level monitoring equipment on his property. CES\D775\Burton Fleming Page 2 Flood Investigation Report- Burton Fleming Winter 2012 / 2013 Table of Contents Page Lead Local Flood Authority and Responsibilities .................................................................... 4 Relevant Flood Risk Management Authorities ....................................................................... 4 Abbreviations ......................................................................................................................... 6 1. Executive Summary ................................................................................................................ 7 1.1 Location of Flooding ....................................................................................................... 8 2. The Drainage System ............................................................................................................ 10 2.1 Geology of the Area ...................................................................................................... 10 2.2 The Land Drainage System ........................................................................................... 10 2.3 Flooding History............................................................................................................ 10 3. The Flooding Event ............................................................................................................... 11 3.1 Conditions before the event......................................................................................... 11 3.2 The Event ...................................................................................................................... 12 4. Causes and Investigation Findings ........................................................................................ 17 5. Conclusions ........................................................................................................................... 18 6. Recommendations ................................................................................................................ 19 Useful Links and Contact Details: ......................................................................................... 20 Appendices: ................................................................................................................................... 21 Appendix 1 Monthly rainfall and groundwater levels ......................................................... 22 Appendix 2 Burton Fleming village ....................................................................................... 23 Appendix 3 Possible routes for alleviation works................................................................. 24 CES\D775\Burton Fleming Page 3 Flood Investigation Report- Burton Fleming Winter 2012 / 2013 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 Burton Fleming during the winter of 2012 / 2013. This report provides details and 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. Relevant Flood Risk Management Authorities The risk management authorities that have relevant flood risk management functions are: East Riding of Yorkshire Council ERYC 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 & Water Management Act 2010. ERYC is also 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 coastal erosion risk management, permissive powers to maintain Main Rivers, Strategic Overview over all forms of flooding and development of a national Flood Risk Strategy. Yorkshire Water Yorkshire Water Services is the statutory sewerage undertaker for the Yorkshire region with a duty to effectually drain sewers pursuant to the Water Industries Act 1991. CES\D775\Burton Fleming Page 4 Flood Investigation Report- Burton Fleming Winter 2012 / 2013 In addition: Riparian Landowners Riparian landowners are those who own land adjoining a watercourse and have certain responsibilities, including the following: They must maintain the bed and banks of an open watercourse, and also the trees and shrubs growing on the banks. They must clear any debris, even if it did not originate from their land, this debris may be natural or man-made. They must keep any structures that they own clear of debris. These structures include culverts, trash screens, weirs and mill gates. If they do not carry out their responsibilities, they could face legal action under the Land Drainage Act 1991. Details of a riparian landowners responsibilities can be found in “Living on the Edge” published by the Environment Agency. Photo 1: Garden waste inappropriately disposed of in the bed of the Gypsey Race - September 2013. Riparian owners are responsible for clearing such debris. CES\D775\Burton Fleming Page 5 Flood Investigation Report- Burton Fleming Winter 2012 / 2013 Abbreviations AOD Above Ordnance Datum Dia. Diameter EA Environment Agency ERYC East Riding of Yorkshire Council GWL Ground Water Level HFRS Humberside Fire and Rescue Service HVP High Volume Pump LLFA Lead Local Flood Authority CES\D775\Burton Fleming Page 6 Flood Investigation Report- Burton Fleming Winter 2012 / 2013 1. Executive Summary The flooding over the winter of 2012/2013 in Burton Fleming was unusual in that it was not as a result of a single rainfall event but due to the cumulative effect of rainfall over a prolonged period. During 2012, persistent wet weather (second wettest year on record in England, see Appendix 1) resulted in exceptionally high water levels in the whole area and in particular the Gypsey Race catchment which includes the Burton Fleming area. Elevated groundwater levels in the chalk combined with high water levels in the Gypsey Race meant the groundwater was not able to drain away and so remained at elevated levels for some time. This also led to many seasonal springs rising across the area, exceptionally high flows in many watercourses on the chalk Wolds with surface and property flooding in many places including parts of Burton Fleming, and the inundation of the foul sewer system. Significant areas of farmland were also flooded in the upper