Anglian River Basin District Flood Risk Management Plan 2015 - 2021 PART B – Sub Areas in the Anglian River Basin District March 2016 1 of 161 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 the Environment Agency’s National www.gov.uk/environment-agency Customer Contact Centre: T: 03708 506506 © Environment Agency 2016 Email: [email protected]. All rights reserved. This document may be reproduced with prior permission of the Environment Agency. 2 of 161 Contents Glossary and abbreviations ......................................................................................................... 5 The layout of this document ........................................................................................................ 7 1. Sub-areas in the Anglian River Basin District ...................................................................... 9 Introduction ................................................................................................................................... 9 Flood Risk Areas ........................................................................................................................ 10 Management Catchments ........................................................................................................... 10 2. Conclusions, objectives and measures to manage risk in the South Essex Flood Risk Area .............................................................................................................................. 11 Introduction to the South Essex Flood Risk Area ........................................................................ 11 Flood risk maps and statistics ..................................................................................................... 14 Conclusions and objectives for the South Essex Flood Risk Area ............................................... 18 Measures across the South Essex Flood risk Area ..................................................................... 20 3. Conclusions, objectives and measures to manage flood risk in Anglian River Basin District Catchments ............................................................................................................. 22 3.1. The Broadland Rivers Catchment ....................................................................................... 25 Introduction to the catchment ...................................................................................................... 25 Flood risk maps and statistics ..................................................................................................... 28 Conclusions and objectives for the Broadland Rivers Catchment ............................................... 33 Measures across the Broadland River Catchment ...................................................................... 35 3.2. The Cam and Ely Ouse Catchment summary..................................................................... 37 Introduction to the catchment ...................................................................................................... 37 Flood risk maps and statistics ..................................................................................................... 40 Conclusions and objectives for the Cam and Ely Ouse Catchment ............................................. 45 Measures across the Cam and Ely Ouse Catchment .................................................................. 46 3.3. The Combined Essex Catchment ........................................................................................ 48 Introduction to the catchment ...................................................................................................... 48 Flood risk maps and statistics ..................................................................................................... 52 Conclusions and objectives in the Combined Essex Catchment ................................................. 57 Measures across the Combined Essex Catchment ..................................................................... 59 3.4. The East Suffolk Catchment ................................................................................................ 61 Introduction to the catchment ...................................................................................................... 61 Flood risk maps and statistics ..................................................................................................... 64 Conclusions and objectives for the East Suffolk Catchment ........................................................ 68 Measures across the East Suffolk Catchment ............................................................................. 70 3.5. The Nene Catchment............................................................................................................ 72 Introduction to the catchment ...................................................................................................... 72 Flood risk maps and statistics ..................................................................................................... 75 Conclusions and objectives for the Nene Catchment .................................................................. 80 3 of 161 Measures across the Nene Catchment ....................................................................................... 81 3.6. The North Norfolk Rivers Catchment .................................................................................. 84 Introduction to the catchment ...................................................................................................... 84 Flood risk maps and statistics ..................................................................................................... 87 Conclusions and objectives for the North Norfolk Rivers Catchment ........................................... 92 Measures across the North Norfolk Rivers Catchment ................................................................ 93 3.7. North West Norfolk Catchment ........................................................................................... 95 Introduction to the catchment ...................................................................................................... 95 Flood risk maps and statistics ..................................................................................................... 99 Conclusions and objectives for the North West Norfolk Catchment ........................................... 103 Measures across the North West Norfolk Catchment ................................................................ 105 3.8. Old Bedford and Middle Level Catchment ........................................................................ 107 Introduction to the catchment .................................................................................................... 107 Flood risk maps and statistics ................................................................................................... 110 Conclusions and objectives for the Old Bedford and Middle Level Catchment .......................... 114 Measures across the Old Bedford and Middle Level Catchment ............................................... 116 3.9. Upper and Bedford Ouse Catchment ................................................................................ 118 Introduction to the catchment .................................................................................................... 118 Flood risk maps and statistics ................................................................................................... 121 Conclusions and objectives for the Upper and Bedford Ouse Catchment ................................. 126 Measures across the Upper and Bedford Ouse Catchment ...................................................... 127 3.10. The Welland Catchment .................................................................................................. 130 Introduction to the catchment .................................................................................................... 130 Flood risk maps and statistics ................................................................................................... 133 Conclusions and objectives for the Welland Catchment ............................................................ 137 Measures across the Welland Catchment ................................................................................. 139 3.11. The Witham Catchment ................................................................................................... 141 Introduction to the catchment .................................................................................................... 141 Flooding from rivers and the sea ............................................................................................... 145 Conclusions and objectives for the Witham Catchment............................................................. 149 Measures across the Witham Catchment ................................................................................. 151 4. The Fens Strategic Area .................................................................................................... 153 Introduction to the Fens Strategic Area ....................................................................................