Wellingborough Level 1 Strategic Flood Risk Assessment Update Living Document – Interactive PDF Northamptonshire County Council February 2017 REVISION SCHEDULE Borough Council of Wellingborough Strategic Flood Risk Assessment Produced by: Northamptonshire County Council County Hall, Northampton Rev Date Details Author Checked Approved 01 7/11/16 Draft Report Josie Alison Parry Alison Parry Bateman (Head of (Head of (Flood and Environment Environment Water Management) Management) Manager) 02 16/1/17 Final draft Report Josie Alison Parry Alison Parry Bateman (Head of (Head of (Flood and Environment Environment Water Management) Management) Manager) 03 2/2/17 Final Report Josie Alison Parry Alison Parry Bateman (Head of (Head of (Flood and Environment Environment Water Management) Management) Manager) 2 CONTENTS PAGE EXECUTIVE SUMMARY ..................................................................................................... 6 OVERVIEW ............................................................................................................................................. 6 STUDY AREA ........................................................................................................................................... 6 OUTCOMES OF THE LEVEL 1 SFRA ............................................................................................................. 6 1. INTRODUCTION ....................................................................................................... 8 BACKGROUND ........................................................................................................................................ 8 APPLYING THE SEQUENTIAL TEST FOR PLAN MAKING PURPOSES ..................................................................... 9 APPLYING THE EXCEPTION TEST FOR PLAN MAKING PURPOSES ....................................................................... 9 IMAGE 2. EXTRACT FROM THE NATIONAL PLANNING POLICY FRAMEWORK ............................... 10 STUDY AREA ......................................................................................................................................... 10 OBJECTIVES .......................................................................................................................................... 10 2. DATA COLLECTION AND REVIEW ............................................................................ 12 OVERVIEW ........................................................................................................................................... 12 TOPOGRAPHY AND GEOLOGY .................................................................................................................. 12 3. FLOOD RISK MANAGEMENT PLANS, STRATEGIES AND STUDIES ............................... 14 NATIONAL FLOOD AND COASTAL EROSION MANAGEMENT STRATEGY FOR ENGLAND ....................................... 14 FLOOD RISK MANAGEMENT PLANS AND RIVER BASIN MANAGEMENT PLANS .................................................. 14 COUNTY-WIDE LOCAL FLOOD RISK MANAGEMENT STRATEGY ....................................................................... 16 NORTH NORTHAMPTONSHIRE DEVELOPMENT STUDY – OUTLINE WATER CYCLE STRATEGY ............................... 17 NORTH NORTHAMPTONSHIRE DETAILED WATER CYCLE STRATEGY ................................................................ 17 NORTH NORTHAMPTONSHIRE FLOOD RISK MANAGEMENT STUDY UPDATE .................................................... 18 WELLINGBOROUGH SURFACE WATER MANAGEMENT PLAN ......................................................................... 18 4. LOCAL DEVELOPMENT FRAMEWORK ...................................................................... 20 NORTH NORTHAMPTONSHIRE CORE SPATIAL STRATEGY .............................................................................. 20 Policy 5 – Water Environment, Resources & Flood Risk Management ........................................ 21 PLAN FOR THE BOROUGH OF WELLINGBOROUGH (PART 2 PLAN) .................................................................. 21 NORTH NORTHAMPTONSHIRE BROWNFIELD LAND ASSESSMENT ................................................................... 22 NEIGHBOURHOOD PLANNING .................................................................................................................. 23 5. FLOOD HISTORY ..................................................................................................... 24 INCIDENTS OF FLOODING ........................................................................................................................ 24 6. PREDICTED FLOOD RISK .......................................................................................... 26 SURFACE WATER FLOODING .................................................................................................................... 26 DRAINAGE ISSUES .................................................................................................................................. 27 FLUVIAL FLOODING ................................................................................................................................ 27 RESIDUAL FLOOD RISK ........................................................................................................................... 28 GROUNDWATER FLOODING ..................................................................................................................... 29 RESERVOIR FLOODING ............................................................................................................................ 30 7. SITE-SPECIFIC INFORMATION.................................................................................. 32 8. FLOOD RISK MANAGEMENT, RESILIENCE AND RESISTANCE ..................................... 38 FLOOD DEFENCES AND ASSETS ................................................................................................................ 38 FLOOD WARNING AND HYDROMETRIC STATIONS........................................................................................ 38 3 EMERGENCY PLANNING AND NEW DEVELOPMENT ....................................................................................... 39 FLOOD RESILIENCE ................................................................................................................................. 40 FLOOD RESISTANCE ................................................................................................................................ 40 REDUCING FLOOD RISK THROUGH SITE LAYOUT AND DESIGN ......................................................................... 41 MODIFICATION OF GROUND LEVELS .......................................................................................................... 41 BUFFER STRIPS ...................................................................................................................................... 41 DEVELOPER CONTRIBUTIONS ................................................................................................................... 42 9. SUSTAINABLE DRAINAGE SYSTEMS ......................................................................... 43 STATUTORY CONSULTEE ROLE ................................................................................................................. 43 WHAT ARE SUSTAINABLE DRAINAGE SYSTEMS? .......................................................................................... 43 GENERAL SUDS ADVICE FOR DEVELOPERS IN NORTHAMPTONSHIRE .............................................................. 43 LOCAL STANDARDS AND GUIDANCE FOR SURFACE WATER DRAINAGE IN NORTHAMPTONSHIRE.......................... 43 FLOOD DATA AND INFORMATION REQUESTS .............................................................................................. 43 TECHNICAL FLOOD ADVICE SERVICE .......................................................................................................... 44 10. RESPONSIBILITIES FOR RISK MANAGEMENT AUTHORITIES ................................... 45 OVERVIEW ........................................................................................................................................... 45 THE ENVIRONMENT AGENCY ................................................................................................................... 45 LEAD LOCAL FLOOD AUTHORITY .............................................................................................................. 46 WATER AND SEWERAGE COMPANIES ........................................................................................................ 48 DISTRICT AND BOROUGH COUNCILS ......................................................................................................... 49 HIGHWAY AUTHORITY ............................................................................................................................ 50 HIGHWAYS ENGLAND ............................................................................................................................. 50 RIPARIAN OWNERS ................................................................................................................................ 51 PARISH COUNCILS ................................................................................................................................. 51 OTHER BODIES ...................................................................................................................................... 51 11. CONCLUSIONS AND RECOMMENDATIONS ..........................................................