Surface Water Management Plan
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LEICESTER CITY COUNCIL SURFACE WATER MANAGEMENT PLAN PART 1 REPORT MAY 2012 UNITED KINGDOM & IRELAND PREPARED FOR: Leicester SWMP - Update & Maintenance Schedule Revision Date Details of Updates Updated/checked Publish? Authorised (if any) by 1 March 2012 First Issue of report Leicester SWMP - Update & Maintenance Checklist Task Consultees Suggested Details & Purpose Date Due Date Completed by completed Council Highways & Transport Flood Risk Events (reported by general March 2013 function Planning Policy & Design public/observed by workforce) liaison Emergency Management Flood Risk Data (modelling from FRAs, ground Environmental Services investigation records, sewer/drainage network updates Parks Services etc) Information Services Planned capital works (identify opportunities for Public relations & integrating surface water management features) engagement Large planning applications in period or coming up? (opportunities to influence surface water management through policy) Flood risks & hazards (reports from public/workforce on blocked culverts, channel maintenance etc) Planned public engagement events (opportunities to collaborate with events on surface water management) Key Partner Environment Agency Flood Risk Events March 2013 Liaison Severn Trent Water Flood Risk Data (modelling/maps/assets) Any flood risk measures undertaken in last period (new defences, telemetry, structures etc) Any planned flood risk management measures in next period (opportunities for collaboration or joint funding)? Neighbouring Leicestershire LLFA Flood Risk Events (any additional information on flood March 2013 Authorities Surrounding Councils events that may impact on PUA or city itself) Flood Risk Data that could influence/impact on City Planned capital works (identify opportunities for integrating surface water management features) Large planning applications in period or coming up? (opportunities to influence surface water management through consistent policy approach) Planned public engagement events (opportunities to collaborate with events on surface water management) Other key Local Resilience Forum Flood Risk Events (number of call outs, location, March 2012 stakeholders Fire & Rescue information on flood event) Police Service Inform services of changes to flood risk from SWMP – NHS does this affect operations? Leicester City Council — Surface Water Management Plan Revision Schedule Leicester City Council SWMP – Part 1 Report May 2012 REVISION SCHEDULE Rev Date Details Prepared by Reviewed by Approved by 01 August 2011 Draft Report Helen Burton Michael Timmins Jon Robinson Flood Risk Associate Technical Director Consultant Fay Tivey Andrew Senior Flood Risk Woodliffe Consultant Principal Consultant 02 February 2012 Final Draft Helen Burton Michael Timmins Flood Risk Associate Consultant Henry Wood Andrew Graduate Flood Woodliffe Risk Consultant Principal Consultant 03 May 2012 FINAL Henry Wood Michael Timmins Jon Robinson Graduate Flood Associate Technical Director Risk Consultant URS Infrastructure & Environment UK Ltd. Royal Court Basil Close Chesterfield S41 7SL Tel 01246 209221 Fax 01246 209229 www.ursglobal.com Leicester City Council — Surface Water Management Plan Limitations URS Environment and Infrastructure (UK) Ltd (―URS‖) has prepared this Report for the sole use of Leicester City Council (―Client‖) in accordance with the Agreement under which our services were performed. No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by URS. 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 URS has not been independently verified by URS, unless otherwise stated in the Report. The methodology adopted and the sources of information used by URS in providing its services are outlined in this Report. The work described in this Report was undertaken between September 2010 and February 2012 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. URS 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 URS‘ 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 modelling results 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. URS specifically does not guarantee or warrant any estimate or projections contained in this Report. Leicester City Council — Surface Water Management Plan Table of Contents Introduction ................................................................................................ 1 Background .................................................................................................................................. 1 What is a Surface Water Management Plan? ............................................................................... 2 Linking and integrating surface water management in Leicester ................................................... 2 1 Phase 1 – Introduction .................................................................... 8 1.1 Identify the need for a SWMP ......................................................................................... 8 1.2 Study Area ...................................................................................................................... 8 1.3 Flood Risk Overview for Leicester ................................................................................ 14 1.4 Establish a Partnership ................................................................................................. 20 1.5 Stakeholder Engagement ............................................................................................. 24 1.6 Clarifying the Scope of the Leicester SWMP ................................................................. 26 1.7 Identify availability of Information .................................................................................. 27 1.8 Phase 1 - Summary ...................................................................................................... 30 2 Phase 2 – Introduction .................................................................. 32 2.1 Intermediate Assessment ............................................................................................. 32 2.2 Risk Overview ............................................................................................................... 33 2.3 Surface Water Flooding ................................................................................................ 40 2.4 Ordinary Watercourse Flooding .................................................................................... 51 2.5 Groundwater Flooding .................................................................................................. 59 2.6 Sewer Flooding ............................................................................................................. 63 2.7 Critical Drainage Areas ................................................................................................. 66 2.8 Impacts of Potential Major Development Surrounding Leicester ................................... 71 2.9 Links to Green Infrastructure ........................................................................................ 79 LCC SWMP Phase 1 and Phase 2 Summary .......................................... 90 Recommendations and Next Steps ........................................................ 97 Appendices ............................................................................................. 102 Appendix A – Groundwater Flood Risk Report ......................................................................... 103 Appendix B – Data Register ..................................................................................................... 104 Appendix C – Hydrological and Hydraulic Modelling Methodology ........................................... 105 Appendix D – Flood Mapping ................................................................................................... 106 Appendix E – Topographical Survey Drawings ......................................................................... 107 Leicester City Council — Surface Water Management Plan List of Tables Table 1-1: Summary of Recorded Historic Flooding Incidents in Leicester ................................................. 15 Table 1-2: Relevant Information and Datasets ............................................................................................. 27 Table 1-3: Data Quality System from SWMP Technical Guidance .............................................................