Nottinghamshire Level 1 Minerals SFRA Update
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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. Whilst the brand is AECOM and operate as one company, contracting entities (all of which are now wholly owned by AECOM) and lines of communication currently remain the same unless specifically agreed or communicated otherwise. URS Infrastructure & Environment UK Limited (“URS”) has prepared this Report for the sole use of Nottinghamshire County Council (“Client”) in accordance with the Agreement under which our services were performed (Proposal Number: 47065807, dated 21st August 2014). No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by URS. 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 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 2014 and July 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. 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 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. 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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