Nottinghamshire Level 1 Minerals SFRA Update Final Report July 2015 47071849 UNITED KINGDOM & IRELAND Prepared for: Nottinghamshire Level 1 Minerals SFRA REVISION SCHEDULE Rev Date Details Prepared by Reviewed by Approved by 1 January Draft report for client Ed Byers Jo Somerton Andrew Woodliffe 2015 comment Flood Risk Consultant Senior Flood Risk Associate Director Consultant Penelope Pickerin Flood Risk Consultant 2 July Final Report Ed Byers Jo Somerton Carl Pelling 2015 Flood Risk Consultant Senior Flood Risk Associate Director Consultant URS Infrastructure and Environment Ltd Royal Court, Basil Close, Chesterfield, S41 7SL, United Kingdom. Phone: +44 (1246) 209221 Fax: +44 (1246) 209229 FINAL REPORT 47071849 July 2015 i Nottinghamshire Level 1 Minerals SFRA Limitations AECOM and URS have now joined together as one company, and will be known as AECOM moving forward. 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FINAL REPORT 47071849 July 2015 ii Nottinghamshire Level 1 Minerals SFRA TABLE OF CONTENTS 1 INTRODUCTION ............................................................... 1 1.1 Background ...................................................................... 1 1.2 Aims and Objectives........................................................ 2 1.3 SFRA Structure ................................................................ 3 2 STUDY AREA .................................................................... 5 2.1 General overview ............................................................. 5 2.2 Geology ............................................................................. 6 2.3 Current Minerals Extraction Situation ........................... 7 3 POLICY CONTEXT ......................................................... 10 3.2 Flood and Water Management Act ............................... 10 3.3 Amendments to policy on Sustainable Drainage Systems .......................................................................... 11 3.4 Flood Risk Regulations ................................................. 13 3.5 National Planning Policy ............................................... 14 3.6 Local Planning Policy .................................................... 17 3.7 The Water Framework Directive ................................... 20 4 LEVEL 1 SFRA METHODOLOGY .................................. 21 4.1 Overview ......................................................................... 21 4.2 Tasks ............................................................................... 21 4.3 Stakeholder Consultation ............................................. 21 4.4 Data/Information Requested ......................................... 23 4.5 Data Presentation .......................................................... 25 4.6 GIS Data Review ............................................................. 25 5 FLOOD RISK IN NOTTINGHAMSHIRE .......................... 42 5.1 Introduction .................................................................... 42 5.2 Requirements of the National Planning Policy Framework ...................................................................... 42 5.3 Historical Flooding ........................................................ 42 5.4 Fluvial Flooding ............................................................. 44 5.5 Surface Water Flooding................................................. 52 5.6 Groundwater Flooding .................................................. 53 5.7 Sewer Flooding .............................................................. 53 5.8 Artificial Sources – Canals and Reservoirs ................ 54 5.9 Existing Flood Risk Management in Nottinghamshire57 5.10 Flood Warning Areas ..................................................... 57 5.11 Emergency Planning and Flood Risk .......................... 59 5.12 Potential Future Minerals Sites and Flood Risk ......... 59 FINAL REPORT 47071849 July 2015 iii Nottinghamshire Level 1 Minerals SFRA 6 FLOOD RISK MANAGEMENT MEASURES .................. 62 6.1 Overview ......................................................................... 62 6.2 Residual Risk ................................................................. 62 6.3 Emergency Planning ..................................................... 63 6.4 Sustainable Flood Risk Management .......................... 63 6.5 Restoration of Minerals Sites ....................................... 64 7 NPPF SEQUENTIAL TEST GUIDANCE......................... 67 7.1 Overview ......................................................................... 67 7.2 Using the SFRA Maps, Data and GIS Layers .............. 71 7.3 How to apply the Sequential Test where there are gaps in data ............................................................................. 73 7.4 The Exception Test ........................................................ 74 7.5 What is a Level 2 SFRA? ............................................... 75 8 SITE SPECIFIC FLOOD RISK ASSESSMENT GUIDANCE ......................................................................................... 76 8.1 Introduction .................................................................... 76 8.2 When is a Flood Risk Assessment required? ............. 76 8.3 Scope of a Site-Specific Flood Risk Assessment ...... 76 8.4 Sequential Approach within Development Sites ........ 79 8.5 Surface Water Management .......................................... 79 8.6 Residual Risk ................................................................. 80 8.7 Summary ......................................................................... 80 9 SUSTAINABLE DRAINAGE SYSTEMS ......................... 82 9.2 What are SuDS? ............................................................. 82 9.3 Why use SuDS? ............................................................. 85 9.4 The SuDS hierarchy ....................................................... 85 9.5 Infiltration SuDS ............................................................. 85 FINAL REPORT 47071849 July 2015 iv Nottinghamshire Level 1 Minerals SFRA Table of Tables Table 1-1: NCC Planning Context for the SFRA: Relevant past and future planning documents .................... 2 Table 2-1: Approximate Areas for the Individual LPAs within Nottinghamshire ................................................ 5 Table 4-1: SFRA Mapping Contents ................................................................................................................ 25 Table 4-2: Detailed Modelled Flood Studies provided for use in the SFRA .................................................... 29 Table 4-3: Recommended national precautionary sensitivity ranges for peak rainfall intensity and peak river flow* ................................................................................................................................................................. 30 Table 4-4 Potential Allocation Mineral Extraction