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20180604 Hertsmere Borough Council SFRA L1 Report Final V6

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20180604 Hertsmere Borough Council SFRA L1 Report Final V6 Hertsmere Borough Council Strategic Flood Risk Assessment Level I Hertsmere Borough Council May 2018 Level 1 Strategic Flood Risk Assessment Update Hertsmere Borough Council Quality information Prepared by Checked by Approved by Luis Martin Ipek Kaymak / Gordon Boote Fida Choudhury Engineer Senior Engineer Project Director Revision History Revision Revision date Details Authorized Name Position 1 31.08.2017 Draft FC Fida Choudhury Project Director 2 29.01.2018 Final for review FC Fida Choudhury Project Director 3 26.02.2018 Final FC Fida Choudhury Project Director 4 12.04.2018 Comments included FC Fida Choudhury Project Director from EA, HCC and HBC 5 23.05.2018 Comments included FC Fida Choudhury Project Director from HBC 6 04.06.2018 Minor edits to Table FC Fida Choudhury Project Director 1.2 Distribution List # Hard Copies PDF Required Association / Company Name - 1 Hertsmere Borough Council, Hertfordshire County Council, Environment Agency Prepared for: Hertsmere Borough Council AECOM Level 1 Strategic Flood Risk Assessment Update Hertsmere Borough Council Prepared for: Hertsmere Borough Council Civic Offices, Elstree Way, Borehamwood WD6 1WA Prepared by: Luis Martin Engineer AECOM Limited AECOM House 63-77 Victoria Street St Albans Hertfordshire AL1 3ER UK T: +44(0)1727 535000 aecom.com © 2018 AECOM Limited. All Rights Reserved. This document has been prepared by AECOM Limited (“AECOM”) for sole use of our client (the “Client”) in accordance with generally accepted consultancy principles, the budget for fees and the terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. Prepared for: Hertsmere Borough Council AECOM Level 1 Strategic Flood Risk Assessment Update Hertsmere Borough Council Contents 1 Introduction and Background................................................................................................................. 1 1.1 Terms of Reference ..................................................................................................................... 1 1.2 Project Background .................................................................................................................... 1 1.3 Approach to Flood Risk Management .......................................................................................... 1 1.4 Partner Organisations ................................................................................................................. 2 1.5 Level 1 SFRA Approach .............................................................................................................. 4 2 Legislative and Planning Policy Context ................................................................................................. 5 2.1 Introduction ................................................................................................................................ 5 2.2 Flood and Water Management Act .............................................................................................. 5 2.3 Flood Risk Regulations ................................................................................................................ 6 2.4 Thames Catchment Flood Management Plan .............................................................................. 7 2.5 National Planning Policy Framework ............................................................................................ 8 2.6 Local Planning Policy .................................................................................................................. 8 2.7 Water Cycle Strategy ................................................................................................................ 10 2.8 National Receptor Dataset ........................................................................................................ 10 2.9 Summary .................................................................................................................................. 10 3 Assessing Flood Risk ........................................................................................................................... 12 3.1 Introduction .............................................................................................................................. 12 3.2 Study Area ................................................................................................................................ 12 3.3 Summary of Flood Sources ....................................................................................................... 13 3.4 Flooding from Rivers ................................................................................................................. 13 3.5 Flooding from Surface Water .................................................................................................... 18 3.6 Flooding from Groundwater ...................................................................................................... 21 3.7 Flooding from Sewers ............................................................................................................... 22 3.8 Reservoirs, Canals and Other Artificial Sources ......................................................................... 23 4 Avoiding Flood Risk – Applying the Sequential Test .............................................................................. 24 4.1 Sequential Approach ................................................................................................................ 24 4.2 Applying the Sequential Test – Plan-Making .............................................................................. 24 4.3 Applying the Sequential Test – Individual Applications ............................................................... 28 4.4 Exception Test .......................................................................................................................... 29 5 Managing and Mitigating Flood Risk ..................................................................................................... 30 5.1 Overview .................................................................................................................................. 30 5.2 Development Layout and Sequential Approach ......................................................................... 30 5.3 Riverside Development (Main Rivers and Ordinary Watercourses) ............................................. 30 5.4 Floodplain Compensation Storage ............................................................................................ 31 5.5 Finished Floor Levels ................................................................................................................ 32 5.6 Flood Resistance ‘Water Exclusion Strategy’ ............................................................................. 32 5.7 Flood Resilience ‘Water Entry Strategy’ ..................................................................................... 34 5.8 Structures ................................................................................................................................ 35 5.9 Safe Access and Egress............................................................................................................ 35 5.10 Safe Refuge .............................................................................................................................. 36 5.11 Car Parks .................................................................................................................................. 36 5.12 Flood Routing ........................................................................................................................... 36 5.13 Flood Warning and Evacuation Plans ......................................................................................... 37 6 Guidance for the Application of Sustainable Drainage Systems (SuDS) ................................................ 38 6.1 What are SuDS? ........................................................................................................................ 38 6.2 Management Train .................................................................................................................... 40 6.3 SuDS Costs .............................................................................................................................. 40 6.4 Infiltration SuDS Specific to Hertsmere ..................................................................................... 43 6.5 What is the role of the HCC? ..................................................................................................... 44 Prepared for: Hertsmere Borough Council AECOM Level 1 Strategic Flood Risk Assessment Update Hertsmere Borough Council 7 Guidance for preparing site-specific FRAs ........................................................................................... 47 7.1 What is a Flood Risk Assessment? ............................................................................................ 47 7.2 When is a Flood Risk Assessment required? .............................................................................. 47 7.3 How detailed should a FRA be? ................................................................................................. 47 7.4 What needs to be addressed in a Flood
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