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Test and Itchen Catchment Flood Management Plan Summary Report December 2009 Managing Flood Risk We Are the Environment Agency

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Test and Itchen Catchment Flood Management Plan Summary Report December 2009 Managing Flood Risk We Are the Environment Agency Test and Itchen Catchment Flood Management Plan Summary Report December 2009 managing flood risk 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 Guildbourne House Chatsworth Road Worthing, West Sussex BN11 1LD Tel: 08708 506 506 Email: [email protected] www.environment-agency.gov.uk © Environment Agency All rights reserved. This document may be reproduced with prior permission of the Environment Agency. Introduction I am pleased to introduce our summary of the Test and Itchen Catchment Flood Management Plan (CFMP). This CFMP gives an overview of the flood risk in the Test and Itchen catchment and sets out our preferred plan for sustainable flood risk management over the next 50 to 100 years. The Test and Itchen CFMP is one of 77 CFMPs for The main source of flood risk in the Test and Itchen England and Wales. Through the CFMPs, we have CFMP is from river flooding and this is concentrated assessed inland flood risk across all of England and within the urban areas such as Romsey, Winchester, Wales for the first time. The CFMP considers all types of Southampton, Andover, Chandlers Ford, Eastleigh, inland flooding, from rivers, groundwater, surface Bishopstoke and Stockbridge. Surface water flooding is water and tidal flooding, but not flooding directly from not thought to be a major problem at present, but the sea (coastal flooding), which is covered by future climate change may make this situation worse. Shoreline Management Plans (SMPs). Our coverage of We cannot reduce flood risk on our own, we will surface and groundwater is however limited due to a therefore work closely with all our partners to improve lack of available information. the co-ordination of flood risk activities and agree the The role of CFMPs is to establish flood risk most effective way to management flood risk in the management policies which will deliver sustainable future. The key partners we have worked with are Defra, flood risk management for the long term. This is Natural England, Eastleigh Borough Council, Hampshire essential if we are to make the right investment County Council, Southampton City Council, Winchester decisions for the future and to help prepare ourselves City Council, Test Valley Borough Council, National effectively for the impact of climate change. We will Trust, Test and Itchen Association, Southern Water. use CFMPs to help us target our limited resources This is a summary of the main CFMP document, if you where the risks are greatest. need to see the full document an electronic version This CFMP identifies flood risk management policies to can be obtained by emailing assist all key decision makers in the catchment. It was [email protected] or alternatively produced through a wide consultation and appraisal paper copies can be viewed at any of our offices in process, however it is only the first step towards an Southern Region. integrated approach to flood risk management. As we all work together to achieve our objectives, we must monitor and listen to each others progress, discuss what has been achieved and consider where we may Toby Willison need to review parts of the CFMP. Regional Director, Southern Region Environment Agency Test and Itchen Catchment Flood Management Plan 3 Contents The purpose of a CFMP in managing flood risk 5 Catchment overview 6 Current and future flood risk 8 Future direction for flood risk management 11 Sub-areas 1 Andover 13 2 Romsey 15 3 Rural Chalk/Upper Middle and Lower Test 16 4 River Dun and River Test to Romsey/Middle Itchen 18 5 Winchester 20 6 Monks Brook 21 7 Lower Itchen 22 8 Coastal urban 23 9 Clay catchment 24 Map of CFMP policies 25 4 Environment Agency Test and Itchen Catchment Flood Management Plan The purpose of a CFMP in managing flood risk CFMPs help us to understand the • IDBs, water companies and CFMPs aim to promote more scale and extent of flooding now other utilities to help plan their sustainable approaches to managing and in the future, and set policies activities in the wider context flood risk. The policies identified in for managing flood risk within the of the catchment; the CFMP will be delivered through a catchment. CFMPs should be used combination of different approaches. • Transportation planners; to inform planning and decision Together with our partners, we making by key stakeholders such as: • Land owners, farmers and will implement these approaches land managers that manage through a range of delivery plans, • The Environment Agency, who will and operate land for projects and actions. use the plan to guide decisions agriculture, conservation on investment in further plans, The relationship between the CFMP, and amenity purposes; projects or actions; delivery plans, strategies, projects • The public and businesses to and actions is shown in figure 1. • Regional planning bodies and enhance their understanding local authorities who can use the of flood risk and how it will plan to inform spatial planning be managed. activities and emergency planning; Figure 1. The relationship between CFMPs, delivery plans, projects and actions. Policy planning • CFMPs and Shoreline Management Plans. • Action plans define requirement for delivery plans, projects and actions. Policy delivery plans (see note) Projects and actions • Influence spatial planning to reduce risk • Make sure our spending delivers the best and restore floodplains. possible outcomes. • Prepare for and manage floods • Focus on risk based targets, for example (including local flood warning plans). numbers of households at risk. • Managing assets. • Water level management plans. • Land management and habitat creation. Note: Some plans may not be led by us – we may • Surface water management plans. identify the need and encourage their development. Environment Agency Test and Itchen Catchment Flood Management Plan 5 Catchment overview The Test and Itchen CFMP mammal, bird, fish, invertebrate In contrast, the geology of the incorporates the catchments of the and plant communities. Both main southern part of the catchment is River Test and River Itchen and their rivers are important sites of nature dominated by clay. The river levels tributaries, an area of approximately conservation and as such are in these locations respond much 1,760 square kilometres. The designated as Sites of Special quicker to rainfall. Major urban downstream limit of the CFMP Scientific Interest (SSSI). The River areas here are concentrated along catchment is located where the Itchen is further designated as a the coast, such as Southampton, Monk’s Brook joins the Itchen Special Area of Conservation (SAC) Totton and Eastleigh. Estuary and the Test joins under European legislation. They The Test and Itchen rivers are Southampton Water which is the are both internationally famous for heavily modified, with many North Solent Shoreline their trout and salmon fishing. structures and multiple or braided Management Plan (SMP) boundary. The geology of the catchment is channels along their lengths. This The North Solent SMP deals with dominated in the north by chalk. supports a number of commercial coastal flood risk management Groundwater in the chalk feeds both fisheries, benefiting from the high issues from the North Solent the River Test and River Itchen and water quality. Mills, navigation stretching from Selsey Bill to Hurst provides the rivers with reliable and water meadows have also led Spit. The rivers are regarded as two flows of water. Here the response of to alterations in the flow of of the finest chalk streams in the river levels to rainfall is slow. The watercourses. world with their crystal clear waters major urban locations in this area supporting a rich diversity of are Andover, Romsey and Winchester. ➜ River Itchen downstream of Winchester City Mill. 6 Environment Agency Test and Itchen Catchment Flood Management Plan Map 1. Overview map of Test and Itchen catchment. ➜ Broadlands Lake, Calmore, near Southampton Environment Agency Test and Itchen Catchment Flood Management Plan 7 Current and future flood risk Overview of the current Where is the risk? flood risk The distribution of flood risk from probability event (1 in 100 year) rivers and from groundwater is occurring within the CFMP area. The Flood risk is the combination of the illustrated in the map on page 10. areas with the highest concentration likelihood of a flood occurring and of properties at risk from river the consequences caused when it The map on page 10 illustrates the flooding are tabulated opposite. does. We have assessed flood risk consequences of a 1% annual across the CFMP area using broad- scale computer modelling, though making best use of existing Figure 2. Current and future (2100) flood risk to property from a 1% annual knowledge and models where probability river flood, taking into account current flood defences. appropriate. Flood risk figures take into account current flood defences. 1400 In the Test and Itchen catchment the Current Future CFMP has considered flooding from 1200 rivers, surface water and sewage flooding from the drainage system, 1000 as well as groundwater flooding. 800 There are over 3,500 properties in the catchment that have a 1% 600 chance of flooding in any one year 400 from rivers or groundwater. Number of properties at flood risk properties at Number of 200 There was extensive flooding in the winter of 2000/01 in the Test and 0 Andover Romsey Winchester Southampton and Itchen catchment affecting up to Eastleigh 300 properties.
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