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Great Ouse Catchment Flood Management Plan – Consultation Draft Plan, January 2007

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Great Ouse Catchment Flood Management Plan – Consultation Draft Plan, January 2007 Great Ouse Catchment Flood Management Plan Consultation Draft Plan (January 2007) Environment Agency i Great Ouse Catchment Flood Management Plan – Consultation Draft Plan, January 2007 We are the Environment Agency. It’s our job to look after your environment and make it a better place – for you, and for future generations. Your environment is the air you breathe, the water you drink and the ground you walk on. Working with business, Government and society as a whole, we are making your environment cleaner and healthier. The Environment Agency. Out there, making your environment a better place. Published by: Environment Agency Kingfisher House Goldhay Way Orton Goldhay Peterborough PE2 5ZR Tel: 08708 506 506 © Environment Agency January 2007 All rights reserved. This document may be reproduced with prior permission of the Environment Agency. Environment Agency ii Great Ouse Catchment Flood Management Plan – Consultation Draft Plan, January 2007 Please send any comments about this consultation document by 30th March 2007 to: Lucy Harper Regional Strategic and Development Planning Environment Agency Kingfisher House Goldhay Way Orton Goldhay Peterborough PE2 5ZR E-mail address: [email protected] Environment Agency Office Anglian Region, Central Area Environment Agency Project Executive Roy Lobley Environment Agency Project Manager Lucy Harper Consultant Royal Haskoning Consultant Project Manager Matthew Hardwick Document History: Draft final draft CFMP v1.0 6th October 2006 Issued to Environment Agency for review by Project Team and Steering Group Draft final draft CFMP v2.0 8th January 2007 Issued to Environment Agency for review by Consultation Group Environment Agency iii Great Ouse Catchment Flood Management Plan – Consultation Draft Plan, January 2007 Foreword Many areas of England and Wales have suffered serious flooding in recent years. In consequence the issue of flooding is very much to the fore, and of concern, to those living in flood risk areas. Future climate change is expected to increase the risk of flooding and continuing development pressures to cope with an ever-growing population must be accommodated and managed against this background. Flood risk management is complex with many links to other policy areas at both national and local level. Government strategy is for an all-embracing approach setting the management of flood risk within the broader concept of a catchment as a whole and Catchment Flood Management Plans (CFMPs) are a key component of this. CFMPs will look to the future over 50 – 100 years taking a broad view at the catchment scale considering the many factors such as climate change, development, land use change and land management to develop and agree sustainable policies for the future management of flood risk. Key to this will be the engagement of the many organisations involved. The Plan will not just focus on traditional engineered methods of flood management but will explore all potential solutions working with nature wherever possible to produce sustainable solutions for the benefit of all. Environment Agency iv Great Ouse Catchment Flood Management Plan – Consultation Draft Plan, January 2007 Contents Contents ...............................................................................................................................................v List of tables.......................................................................................................................................vii List of figures......................................................................................................................................ix Executive summary.............................................................................................................................1 1 Introduction ..........................................................................................................................4 1.1 Background 4 1.2 Great Ouse CFMP: Aims and scope 5 1.4 Involving others 10 1.5 Monitoring, review and evaluation of the CFMP 11 2 Catchment overview ..........................................................................................................13 2.1 Definition and extent of the Great Ouse Catchment 13 2.2 Topography 18 2.3 Geology and hydrogeology 18 2.4 Geomorphology 23 2.5 Soils 24 2.6 Land use and land management 27 2.7 Hydrology 32 2.8 Environment and heritage 44 2.9 Communities and the local economy 60 3 Current flood risks and management ..............................................................................64 3.1 History of flooding 64 3.2 Sources and probability of flooding 65 3.3 Consequences of flooding 83 3.4 Summary of flood risk 111 3.5 Existing flood risk management 113 4 Future changes ................................................................................................................121 4.1 Introduction 121 4.2 Future scenarios 121 4.3 Assessment of future flood risk 127 4.4 Flood risk at key locations 135 5 Catchment objectives ......................................................................................................136 5.1 Introduction 136 5.2 Catchment opportunities and constraints 136 5.3 CFMP objectives 142 6 Policy appraisal................................................................................................................146 6.1 Introduction 146 6.2 Policies for the Great Ouse catchment 147 7 Delivering the CFMP ........................................................................................................161 Environment Agency v Great Ouse Catchment Flood Management Plan – Consultation Draft Plan, January 2007 7.1 Action plan 161 7.2 Inter-relationships between selected policies and actions 175 List of abbreviations .......................................................................................................................177 Glossary of terms ............................................................................................................................180 References .......................................................................................................................................194 Appendix A – Responsibilities for flood Risk Management and Associated Activities Appendix B - Environmental Report Appendix C – Communication plan Appendix D – Environmental features Appendix E – Landscape character Appendix F – Main sites identified for current and future wetland creation Appendix G – Flood Risk Appendix H – Policies relevant to the Great Ouse CFMP Appendix I – Current flood defence improvements Appendix J – Results of the sensitivity tests Appendix K – Results of the scenario tests Appendix L – Strategic flood storage assessment Appendix M – Policy appraisal Environment Agency vi Great Ouse Catchment Flood Management Plan – Consultation Draft Plan, January 2007 List of tables Table 1.1 Programme for development of the Great Ouse CFMP 12 Table 2.1 Sub-catchment overview 14 Table 2.2 Overall distribution of land use on the catchment 27 Table 2.3 Comparison of urban development in the UK 28 Table 2.4 Relative importance of tributaries to Bedford Ouse 35 Table 2.5 Flood peak travel on Bedford Ouse 35 Table 2.6 Relative importance of sub-catchments 39 Table 2.7 Time of travel of flood peak for given rivers 39 Table 2.8 BAP habitats in the Great Ouse catchment 46 Table 2.9 Summary of Joint Character Areas 48 Table 2.10 Chemical and biological General Quality Assessment grades (2004) for the Great Ouse catchment 55 Table 2.11 Population distribution within the catchment 60 Table 2.12: Community statistics 61 Table 3.1 Tide levels 79 Table 3.2 Assessment of risk to people 87 Table 3.3 Average Annual Damages (AAD) for high impact areas 101 Table 3.4 Isolated settlements during a 1 in 100 year (1% AEP) flood event 103 Table 3.5 Summary table of existing flood risk to property for the high impact areas 104 Table 3.6 Analysis of fenland areas within Flood Zone 3 106 Table 3.7 Infrastructure potentially at risk 107 Table 3.8 Environmental assets at risk of flooding 109 Table 3.9 Summary of flood risk 111 Table 3.10 Main River defences 114 Table 4.1 Historical trends in population numbers across the Great Ouse catchment 122 Table 4.2 Historical trends in household numbers across the Great Ouse catchment 122 Table 4.3 Housing targets for the Great Ouse catchment 123 Table 4.4 Predicted sea level changes 125 Table 4.5 Future scenarios 127 Table 4.6 Future flood risk issues 128 Table 4.7 Impact of future scenarios on economic flood risk (% AAD increase per sub catchment) 130 Table 4.8 Impact of climate change on flood risk to people and property 130 Table 5.1 Strategic storage assessment for selected rivers 138 Table 5.2 Extra volumes due to climate change requiring storage 139 Table 5.3 Strategic storage assessment for the Fens 139 Table 5.4 Opportunities and Constraints 140 Table 5.5 Objectives for the Great Ouse CFMP 143 Environment Agency vii Great Ouse Catchment Flood Management Plan – Consultation Draft Plan, January 2007 Table 6.1 Six policy options 146 Table 6.3 Eastern Rivers summary table 151 Table 6.4 Southern Rivers summary table 153 Table 6.5 Bedford Ouse summary table 156 Table 6.6 The Fens summary table 159 Table 7.1 Prioritised action 161 Environment Agency viii Great Ouse Catchment Flood Management Plan – Consultation Draft Plan, January 2007 List of figures Figure S1 Policy units and proposed policies..................................................................................3 Figure 1.1 The Great
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