Northumberland Strategic Flood Risk
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Northumberland Level 2 Strategic Flood Risk Assessment Final October 2015 47070326 Prepared for: Northumberland County Council UNITED KINGDOM & IRELAND Northumberland County Council — Level 2 Strategic Flood Risk Assessment REVISION SCHEDULE Rev Date Details Prepared by Reviewed by Approved by 1 October 2014 Draft Srimali Dixon Ruth Goodall Ruth Goodall Senior Assistant Technical Technical Director Engineer Director Catherine Minor Assistant Engineer 2 May 2015 Final– Inclusion of NWL, Srimali Dixon Ruth Goodall Ruth Goodall NCC and EA comments Engineer Technical Technical Director Director Catherine Minor Assistant Engineer 3 July 2015 Final Rizal Roney Jaime Ball Jaime Ball Engineer Principal Principal Engineer Engineer Catherine Minor Assistant Engineer 4 October 2015 Final Catherine Minor Jaime Ball Simon Keys Assistant Engineer Principal Associate Engineer URS Infrastructure & Environment UK Limited Cedar House 2nd Floor, Building IV III Acre Princeton Drive Teesdale Business Park Stockton on Tees TS17 6FB Tel: 0191 230 7700 FINA L October 2015 1 Northumberland County Council — Level 2 Strategic Flood Risk Assessment Limitations URS Infrastructure & Environment UK Limited (“URS”) has prepared this Report for the sole use of Northumberland County Council (“Client”) in accordance with the Agreement under which our services were performed 47070326 and February 2014. 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FINA L October 2015 2 Northumberland County Council — Level 2 Strategic Flood Risk Assessment TABLE OF CONTENTS ABBREVI ATIONS.......................................................................... 5 GLOSSARY .................................................................................. 7 1 INTRODUCTION........................................................... 9 1.1 Planning Context......................................................... 9 1.2 SFRA Overview ........................................................... 9 1.3 Aims of the Level 2 SFRA............................................ 9 1.4 Level 2 SFRA Objectives ............................................10 1.5 Scope of Level 2 SFRA ...............................................10 1.6 Study Area..................................................................11 2 SEQUENTI AL APP ROACH TO SITE ALLOCATION .....14 2.1 Flood Zone Definition .................................................14 2.2 Development Vulnerability .........................................14 2.3 Sequential Test ..........................................................16 2.4 Exception Test ...........................................................17 3 LEV EL 2 SFRA METHODOLOGY ................................20 3.1 Overview ....................................................................20 3.2 Stakeholders ..............................................................20 3.3 Information/Data Collected.........................................20 3.4 Flooding from Rivers..................................................21 3.5 Flooding from the Land ..............................................21 3.6 Flooding from Groundwater .......................................24 3.7 Flooding from Sewers ................................................24 3.8 Flooding from Reservoirs, Canals and Other Artificial Source s ......................................................................24 3.9 Tidal Flooding ............................................................25 3.10 Consideration of Climate Change...............................26 4 LEV EL 2 STRATEGIC FLOOD RISK ASS ESSMENT ....28 4.2 Core Strategy Delivery Area – South Ea st : Amble .....30 4.3 Core Strategy Delivery Area – South Ea st: Blyth........37 4.4 Core Strategy Delivery Area – South East : Cramlington ...................................................................................51 4.5 Core Strategy Delivery Area – Central: Hexham .........59 4.6 Core Strategy Delivery Area – Central: Prudhoe ........75 4.7 Core Strategy Delivery Area – Central: Ponteland......83 4.8 Core Strategy Delivery Area – North: Belford.............96 4.9 Core Strategy Delivery Area – North: Wooler ........... 104 4.10 Core Strategy Delivery Area – West: Haltwhistle...... 114 FINA L October 2015 3 Northumberland County Council — Level 2 Strategic Flood Risk Assessment 4.11 Core Strategy Delivery Area – West: Haydon Bridge 122 4.12 Core Strategy Delivery Area – West: Bellingham ..... 130 5 SITE-SP ECIFI C FLOOD RIS K ASSESSMENTS.......... 139 5.1 Overview .................................................................. 139 5.2 Detailed/Site-Specific Flood Risk Asse ssment......... 139 5.3 Site Vulnerability and Site Layout ............................ 140 5.4 Building De sign........................................................ 140 5.5 Surface Water Management ..................................... 141 5.6 Climate Change ........................................................ 142 6 MITIGATION MEETING THE NPPF EXCEPTION TEST – RESIDUAL RISK MITIGATION................................... 144 6.1 Residual Risks ......................................................... 144 6.2 Flood Resilience and Resistance Measure s ............. 144 6.3 Emergency Acce ss and Egre ss................................ 145 6.4 Flood Warning and Evacuation Plans ...................... 146 7 USER FRIENDLY GUI DE T O LEV EL 2 SF RA ............. 147 7.1 Planning Practice Guidance for Level 2 SFRAs........ 147 8 CONCLUSIONS AND RECOMMENDATIONS ............. 151 FINA L October 2015 4 Northumberland County Council — Level 2 Strategic Flood Risk Assessment ABBREVIATIONS ACRONYM DEFINITION AEP Annual Exceedance Probability AIMS Asset Information Management System AONB Area of Outstanding Natural Beauty BW British Waterways CFMP Catchment Flood Management Plan DEM Digital Elevation Model DPD Development Plan Documents EA Environment Agency EP English Partnerships FRA Flood Risk Assessment GIS Geographical Information Systems GWV Groundwater Vulnerability IDB Internal Drainage Board LDDs Local Development Documents LDF Local Development Framework LDS Local Development Scheme LiDAR Light Detection and Ranging LPA Local Planning Authority NCC Northumberland County Council NFCDD National Flood and Coastal Defence Database NPPF National Planning Policy Framework ODPM Office of the Deputy Prime Minister OPSI Office of Public Sector Information PCPA Planning and Compulsory Purchase Act (2004) PDA Potential Development Area PPG Planning Practice Guidance RFRA Regional Flood Risk Assessment RPG Regional Planning Guidance FINA L October 2015 5 Northumberland County Council — Level 2 Strategic Flood Risk Assessment ACRONYM DEFINITION RSS Regional Spatial Strategy SAR Synthetic Aperture Radar SA Sustainability Assessment SFRA Strategic Flood Risk Assessment SHLAA Strategic Housing Land Availability Assessment SOS Standard of Service (specifically relating to the performance of water infrastructure) SPG Supplementary Planning Guidance SPZ Source Protection Zone SSSI Site of Special Scientific Interest SW Scott Wilson (now URS) URS URS Infrastructure & Environment