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Level 1 Strategic Flood Risk Assessment Update

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Level 1 Strategic Flood Risk Assessment Update Final Report Submitted to Submitted by Stevenage Borough Council AECOM 63-77 Victoria Road St Albans AL1 3ER United Kingdom Stevenage Borough Council Level 1 Strategic Flood Risk Assessment Update June 2016 AECOM Project No. 60486866 AECOM Level 1 Strategic Flood Risk Assessment Update Page i Prepared by: Luis Martin Checked by: Gordon Boote Graduate Engineer Senior engineer Approved by: Fida Choudhury Associate Director Rev No Comments Checked by Approved by Date 3 Final Report (minor revision in section 2.7) GB FC 23.06.16 2 Final Report GB FC 13.06.16 1 Draft Report for Client and Stakeholder Review GB FC 09.05.16 63-77 Victoria Rd, St Albans, AL1 3ER, United Kingdom Telephone: 01727535000 Website: http://www.aecom.com Job No 60486866 Final Report June 2016 Project Number: 60486866 June 2016 AECOM Level 1 Strategic Flood Risk Assessment Update Page ii Limitations AECOM Limited (“AECOM”) has prepared this Report for the sole use of Stevenage Borough Council (“Client”) in accordance with the Agreement under which our services were performed (Stevenage Borough Council SFRA Update Tender Submission of 15th January 2016). No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by AECOM. This Report is confidential and may not be disclosed by the Client nor relied upon by any other party without the prior and express written agreement of 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 February and May 2016 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 AECOM Limited. Any unauthorised reproduction or usage by any person other than the addressee is strictly prohibited. Project Number: 60486866 June 2016 AECOM Level 1 Strategic Flood Risk Assessment Update Page iii Contents Executive Summary ............................................................................................................................................................. 1 1 Introduction and Background ..................................................................................................................................... 2 1.1 Terms of Reference .............................................................................................................................................. 2 1.2 Project Background .............................................................................................................................................. 2 1.3 Approach to Flood Risk Management .................................................................................................................. 2 1.4 Partner Organisations ........................................................................................................................................... 3 1.5 Level 1 SFRA Approach ........................................................................................................................................ 5 1.5.1 Gathering data and analysing it for suitability .............................................................................................. 5 1.5.2 Producing strategic flood risk maps, GIS deliverables and a technical report ............................................ 5 1.5.3 Providing suitable guidance ......................................................................................................................... 5 2 Legislative and Planning Policy Context .................................................................................................................... 6 2.1 Introduction .......................................................................................................................................................... 6 2.2 Flood and Water Management Act ....................................................................................................................... 6 2.2.1 National Strategy for Flood and Coastal Erosion Risk Management ........................................................... 6 2.2.2 Local Flood Risk Management Strategy ...................................................................................................... 7 2.3 Flood Risk Regulations ......................................................................................................................................... 7 2.3.1 Preliminary Flood Risk Assessment ............................................................................................................. 8 2.4 Thames River and Great Ouse Basin District Flood Risk Management Plans ...................................................... 8 2.5 National Planning Policy Framework .................................................................................................................... 9 2.5.1 NPPF Guidance SuDS Policy (April 2015) .................................................................................................... 9 2.6 Local Planning Policy ............................................................................................................................................ 9 2.6.1 Local Flood Risk Management Strategy .................................................................................................... 10 2.7 Water Cycle Strategy.......................................................................................................................................... 10 2.8 National Receptor Dataset ................................................................................................................................. 11 2.9 Summary ............................................................................................................................................................. 11 3 Assessing Flood Risk ................................................................................................................................................. 12 3.1 Introduction ........................................................................................................................................................ 12 3.2 Study Area .......................................................................................................................................................... 12 3.2.1 Location ..................................................................................................................................................... 12 3.2.2 Hydrogeology ............................................................................................................................................. 12 3.3 Summary of Flood Sources ................................................................................................................................ 12 3.4 Flooding from Rivers ........................................................................................................................................... 13 3.4.1 Sources ...................................................................................................................................................... 13 3.4.2 Structures .................................................................................................................................................. 14 3.4.3 Historic Records of River Flooding ............................................................................................................ 14 3.4.4 NPPF Flood Zones ...................................................................................................................................... 14 3.4.5 Flood Risk Management Measures ............................................................................................................ 18 3.4.6 Flood Warning Areas .................................................................................................................................. 19 3.5 Flooding from Surface Water ............................................................................................................................
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