South East River Basin District Flood Risk Management Plan 2015 - 2021 PART B: Sub Areas in the South East River Basin District
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South East River Basin District Flood Risk Management Plan 2015 - 2021 PART B: Sub Areas in the South East river basin district March 2016 Published by: Environment Agency Further copies of this report are available Horizon house, Deanery Road, from our publications catalogue: Bristol BS1 5AH www.gov.uk/government/publications Email: [email protected] or our National Customer Contact Centre: www.gov.uk/environment-agency T: 03708 506506 Email: [email protected]. © Environment Agency 2016 All rights reserved. This document may be reproduced with prior permission of the Environment Agency. Contents Glossary and abbreviations ......................................................................................................... 5 The layout of this document ........................................................................................................ 7 1 Sub-areas in the South East river basin district .............................................................. 9 Introduction ................................................................................................................................. 9 Flood Risk Areas ......................................................................................................................... 9 Management catchments ............................................................................................................ 9 2 Conclusions, objectives and measures to manage risk for the Brighton and Hove Flood Risk Area........................................................................................................................... 11 Introduction to the Brighton and Hove Flood Risk Area ............................................................. 11 Flood risk maps and statistics .................................................................................................... 13 Conclusions and objectives for the Brighton and Hove Flood Risk Area .................................... 18 Measures to manage flood risk across the Brighton and Hove Flood Risk Area ........................ 19 3 Conclusions, objectives and measures to manage flood risk in South East river basin district catchments ..................................................................................................................... 21 3.1 The New Forest catchment ................................................................................................... 22 Introduction to the catchment .................................................................................................... 22 Flood risk maps and statistics .................................................................................................... 25 Conclusions and objectives for the New Forest catchment ........................................................ 31 Measures to manage risk across the New Forest Catchment .................................................... 32 3.2 The Isle of Wight catchment ................................................................................................ 34 Introduction to the catchment .................................................................................................... 34 Flood risk maps and statistics .................................................................................................... 37 Conclusions and objectives for the Isle of Wight catchment....................................................... 40 Measures to manage risk across the Isle of Wight catchment ................................................... 42 3.3 The Test and Itchen catchment ............................................................................................ 43 Introduction to the catchment .................................................................................................... 43 Flood risk maps and statistics .................................................................................................... 46 Conclusions and objectives for the Test and Itchen Catchment ................................................. 52 Measures to manage risk across the Test and Itchen catchment .............................................. 53 3.4 The East Hampshire catchment .......................................................................................... 55 Introduction to the catchment .................................................................................................... 55 Flood risk maps and statistics .................................................................................................... 58 Conclusions and objectives for the East Hampshire catchment ................................................. 64 Measures to manage risk across the East Hampshire catchment .............................................. 65 3.5 The Arun and Western Streams catchment ....................................................................... 67 Introduction to the catchment .................................................................................................... 67 Flood risk maps and statistics .................................................................................................... 70 Conclusions and objectives for the Arun and Western Streams catchment ............................... 76 Measures to manage risk across the Arun and Western Streams catchment ............................ 77 3.6 The Adur and Ouse catchment ........................................................................................... 79 Introduction to the catchment .................................................................................................... 79 Flood risk maps and statistics .................................................................................................... 83 Conclusions and objectives for the Adur and Ouse catchment .................................................. 89 Measures to manage risk across the Adur and Ouse catchment ............................................... 90 3.7 The Cuckmere and Pevensey Levels catchment ............................................................... 92 Introduction to the catchment .................................................................................................... 92 Flood risk maps and statistics .................................................................................................... 95 Conclusions and objectives for the Cuckmere and Pevensey Levels catchment ..................... 100 Measures to manage risk across the Cuckmere and Pevensey Levels catchment .................. 101 3.8 The Rother and Romney catchment ................................................................................. 103 Introduction to the catchment .................................................................................................. 103 Flood risk maps and statistics .................................................................................................. 106 Conclusions and objectives for the Rother and Romney catchment ........................................ 109 Measures to manage risk across the Rother and Romney catchment ..................................... 110 3.9 The Stour catchment ......................................................................................................... 112 Introduction to the catchment .................................................................................................. 112 Flood risk maps and statistics .................................................................................................. 115 Conclusions and objectives for the Stour catchment ............................................................... 119 Measures to manage risk across the Stour catchment ............................................................ 121 Glossary and abbreviations AONB Area of Outstanding Natural Beauty BAP Biodiversity Action Plan Catchment The watershed of a surface water river system CaBA Catchment based approach: an approach to environmental planning that focuses on local engagement and partnerships CFMP Catchment Flood Management Plan Coastal Groups Voluntary coastal defence groups made up of maritime district authorities and other bodies with coastal defence responsibilities. DCLG Department for Communities and Local Government Defra Department for Environment, Food and Rural Affairs EA Environment Agency EIA Environmental Impact Assessment EPR Environmental Protection Regulations EU European Union FCERM Flood and Coastal Erosion Risk Management FCRM Flood and Coastal Risk Management Floods Directive The European Floods Directive (2007/60/EC) on the assessment and management of flood risks. Flood Risk Area Areas where the risk of flooding from local flood risks is significant as designated (FRA) under the Flood Risk Regulations. FRMP Flood Risk Management Plan – plan produced to deliver the requirements of the Flood Risk Regulations. Government The term government is used within this report to refer to Defra (the Department for Environment, Flood and Rural Affairs) and Welsh Government. Groundwater Occurs when water levels in the ground rise above the natural surface. Low-lying flooding areas underlain by permeable strata are particularly susceptible. Ha Hectares HRA Habitats Regulations Assessment: an assessment undertaken in relation to a site designated under the Habitats and Birds Directives IDB Internal drainage board IDD Internal drainage district km Kilometres LDF Local Development Framework LLFA