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Southend-On-Sea Surface Water Management Plan

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Southend-On-Sea Surface Water Management Plan Southend-on-Sea Surface Water Management Plan November 2015 Prepared by: Danielle Skilton – Flood Risk Consultant Checked by: Elizabeth Gent – Associate Approved by: Elizabeth Gent - Associate Rev No Comments Checked by Approved by Date 5 Final Elizabeth Gent Elizabeth Gent November 2015 4 Final Draft Elizabeth Gent Jon Robinson August 2015 3 Revision for Client Comment Sarah Kelly Jon Robinson December 2014 2 Final Report June 2011 1 Draft Report (for internal review) Matthew Graham Jon Robinson May 2011 Scott House, Alençon Link, Basingstoke, Hampshire, RG21 7PP, United Kingdom Telephone: 01256 310 200 Website: http://www.aecom.com Job No Reference Date Created 47071307 SBC_SWMP_Rev_5_Nov_2015_Issued_20112015.dox November 2015 Surface Water Management Plan November 2015 Limitations AECOM Infrastructure & Environment UK Limited (“AECOM”) has prepared this Report for the sole use of Southend-on- Sea Borough Council (“Client”) in accordance with the Agreement under which our services were performed [Proposal dated 14th October 2014]. No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by AECOM. The conclusions and recommendations contained in this Report are based upon information provided by others and upon the assumption that all relevant information has been provided by those parties from whom it has been requested and that such information is accurate. Information obtained by AECOM has not been independently verified by AECOM, unless otherwise stated in the Report. The methodology adopted and the sources of information used by AECOM in providing its services are outlined in this Report. The work described in this Report was undertaken between October 2014 and November 2015 and is based on the conditions encountered and the information available during the said period of time. The scope of this Report and the services are accordingly factually limited by these circumstances. Where assessments of works or costs identified in this Report are made, such assessments are based upon the information available at the time and where appropriate are subject to further investigations or information which may become available. AECOM disclaim any undertaking or obligation to advise any person of any change in any matter affecting the Report, which may come or be brought to AECOM’s attention after the date of the Report. Certain statements made in the Report that are not historical facts may constitute estimates, projections or other forward- looking statements and even though they are based on reasonable assumptions as of the date of the Report, such forward-looking statements by their nature involve risks and uncertainties that could cause actual results to differ materially from the results predicted. AECOM specifically does not guarantee or warrant any estimate or projections contained in this Report. Copyright © This Report is the copyright of Southend on Sea Borough Council. Any unauthorised reproduction or usage by any person other than the addressee is strictly prohibited. Surface Water Management Plan November 2015 Contents Executive Summary ............................................................................................................................................................. 1 1 Introduction and Aims ................................................................................................................................................. 3 1.1 Introduction ............................................................................................................................................................ 3 1.2 Summary of Phase 1 ............................................................................................................................................. 4 1.3 Aims and Objectives of Phases 2, 3 and 4 ............................................................................................................ 5 1.4 Study Area ............................................................................................................................................................. 6 Phase 2: Risk Assessment .................................................................................................................................................. 7 2 Phase 2 Risk Assessment: Introduction .................................................................................................................... 8 2.1 Level of Assessment ............................................................................................................................................. 8 2.2 Sources of Flooding .............................................................................................................................................. 8 3 Surface Water Flooding ............................................................................................................................................. 10 3.1 Overview ............................................................................................................................................................. 10 3.2 Responsibility ...................................................................................................................................................... 10 3.3 Information and Data Review .............................................................................................................................. 10 3.3.1 Overview ..................................................................................................................................................... 10 3.3.2 LiDAR ......................................................................................................................................................... 10 3.3.3 Updated Flood Map for Surface Water ....................................................................................................... 11 3.3.4 Historical Flood Records ............................................................................................................................. 12 3.4 Summary of Surface Water Flood Risk ............................................................................................................... 13 4 Groundwater Flooding .............................................................................................................................................. 16 4.1 Overview ............................................................................................................................................................. 16 4.2 Responsibility ...................................................................................................................................................... 16 4.3 Information and Data Review .............................................................................................................................. 16 4.4 Summary of Groundwater Flood Risk ................................................................................................................. 16 4.4.1 Groundwater Flooding Mechanisms ........................................................................................................... 16 4.4.2 Evidence of Groundwater Flooding ............................................................................................................. 17 4.4.3 Groundwater Flooding Susceptibility Datasets ............................................................................................ 17 5 Sewer Flooding .......................................................................................................................................................... 18 5.1 Overview ............................................................................................................................................................. 18 5.2 Responsibility ...................................................................................................................................................... 18 5.3 Information and Data Review .............................................................................................................................. 19 5.3.1 Historic Records of Flooding ....................................................................................................................... 19 5.3.2 DG5 Register .............................................................................................................................................. 19 6 Ordinary Watercourses ............................................................................................................................................. 20 6.1 Overview ............................................................................................................................................................. 20 6.2 Information and Data Review .............................................................................................................................. 20 7 Identification of Critical Drainage Areas .................................................................................................................. 22 7.1 Overview ............................................................................................................................................................. 22 7.2 Area Assessment – CDA1: Eastwood ................................................................................................................
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