Flood Investigation Report Tidal Surge Flooding Events on 5 December 2013 CES\FM009 June 2014 Flood Investigation Report Tidal Surge Flooding Events on 5 December 2013 CES\FM009 Page | 1 Flood Investigation Report Tidal Surge Flooding Events on 5 December 2013 Revision Schedule East Riding of Yorkshire Council Flood Investigation Report Tidal Surge Flooding Events on 5 December 2013 Rev Date Details Author Checked and Approved By Rev 1 Jan 2014 Initial Draft AM Rev 2 22 April 30th Final Initial Draft AM GP Rev 3 May 7th Draft Final Report AM MB Rev 4 May 19th Draft Final Report AM DJW Rev 5 May 27th CMT Consultation Draft AM NL Rev 6 May 29th Post EA Consultation Draft AM CMT Rev 7 June 10th Post CMT Consultation Draft AM DJW CES\FM009 Page | 2 Flood Investigation Report Tidal Surge Flooding Events on 5 December 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. The Environment Agency Ouse and Humber IDB Reedness and Swinefleet IDB South Holderness IDB Humberside Fire and Rescue Service Humberside Police Blacktoft Parish Council Associated British Ports Hull City Council North East Lincolnshire Council Lincolnshire Wildlife Trust National Farmers Union CES\FM009 Page | 3 Flood Investigation Report Tidal Surge Flooding Events on 5 December 2013 Contents Flood Investigation Report ...................................................................................................................... 1 Revision Schedule ................................................................................................................................... 2 Copyright Notice ..................................................................................................................................... 3 Acknowledgements ................................................................................................................................. 3 Contents .................................................................................................................................................. 4 Lead Local Flood Authority and Responsibilities .................................................................................... 8 Relevant Flood Risk Management Authorities ....................................................................................... 9 East Riding of Yorkshire Council .............................................................................................................. 9 Environment Agency ............................................................................................................................... 9 Yorkshire Water ...................................................................................................................................... 9 Internal Drainage Boards ........................................................................................................................ 9 Other LLFA’s ............................................................................................................................................ 9 Riparian Landowners ............................................................................................................................ 10 Abbreviations and Acronyms ................................................................................................................ 11 Glossary ................................................................................................................................................. 12 Storm Surge....................................................................................................................................... 12 Spring Tides ....................................................................................................................................... 12 Design Standards and Return Periods .............................................................................................. 12 Gold and Silver Group (Emergency Response) ................................................................................. 13 Strategic Co-ordinating Group (Gold) ............................................................................................... 13 Tactical Co-ordinating Group (Silver) ................................................................................................ 13 Damage Assessment Methodology .................................................................................................. 13 Grade 1 and 2 Agricultural Land ....................................................................................................... 13 Grade 1 - Excellent Quality Agricultural Land ................................................................................... 13 Grade 2 - Very Good Quality Agricultural Land ................................................................................ 13 Data Analysis Carried Out To Inform The Report ................................................................................. 14 1 Executive Summary ....................................................................................................................... 15 2 Location of Flooding ...................................................................................................................... 18 2.1 Coast ..................................................................................................................................... 18 2.2 Humber (North Bank) ............................................................................................................ 19 2.3 Humber (South Bank) ............................................................................................................ 20 3 Flood Defences and Land Drainage Systems ................................................................................ 21 3.1 Environment Agency ............................................................................................................. 21 CES\FM009 Page | 4 Flood Investigation Report Tidal Surge Flooding Events on 5 December 2013 3.2 Internal Drainage Boards ...................................................................................................... 21 3.3 East Riding of Yorkshire Council ............................................................................................ 21 3.4 Coastal and River Humber Flood Defences........................................................................... 21 3.5 Review of the Flood Defences .............................................................................................. 22 3.6 Analysis of the available Surge Data ..................................................................................... 22 3.7 Land Drainage System ........................................................................................................... 24 3.8 Flooding History .................................................................................................................... 24 4 The Flooding Event ........................................................................................................................ 25 4.1.1 Weather Data ................................................................................................................ 25 4.1.2 Climate Change ............................................................................................................. 25 4.1.3 Wind Speed and Wave Analysis .................................................................................... 26 4.2 Flood Warning System - Details ............................................................................................ 27 4.2.1 Severe Weather Warnings ............................................................................................ 27 4.2.2 Flood Warnings ............................................................................................................. 27 4.3 Review of the EA Flood Warnings ......................................................................................... 28 4.4 Analysis Findings ................................................................................................................... 28 4.5 The Event .............................................................................................................................. 29 4.6 The Response ........................................................................................................................ 31 4.7 The Effects ............................................................................................................................. 32 4.8 Coastal Defence .................................................................................................................... 35 4.9 Coastal Wildlife ....................................................................................................................