River Don Catchment Flood Management Plan
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Don Catchment Flood Management Plan Summary Report December 2010 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 Rivers House 21 Park Square South Leeds LS1 2QG Tel: 0870 8506506 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. December 2010 Introduction I am pleased to introduce our summary of the Don Catchment Flood Management Plan (CFMP). This CFMP gives an overview of the flood risk in the Don catchment and sets out our preferred plan for sustainable flood risk management over the next 50 to 100 years. The Don CFMP is one of 77 CFMPs for England and properties are at risk of flooding during a 0.5 per cent Wales. Through the CFMPs, we have assessed inland probability tidal flood. In both situations this assumes flood risk across all of England and Wales for the first there are no defences in place. The risks from surface time. The CFMP considers all types of inland flooding, water have not been fully explored within this CFMP, from rivers, ground water, surface water and tidal however, this form of flooding has been estimated to flooding, but not flooding directly from the sea (coastal be the cause of up to 70 per cent of property flooding flooding), which is covered by Shoreline Management during recent floods Plans (SMPs). Our coverage of surface and ground water We cannot reduce flood risk on our own, we will is however limited due to a lack of available information. therefore work closely with all our partners to improve The role of CFMPs is to establish flood risk management the co-ordination of flood risk activities and agree the policies which will deliver sustainable flood risk most effective way to manage flood risk in the future. management for the long term. This is essential if we are We have worked with others including Planning and to make the right investment decisions for the future and Local Authorities, Yorkshire Water, British Waterways , to help prepare ourselves effectively for the impact of Internal Drainage Boards (IDBs) and Natural England to climate change. We will use CFMPs to help us target our develop this CFMP. limited resources where the risks are greatest. This is a summary of the main CFMP document, if you This CFMP identifies flood risk management policies to need to see the full document an electronic version assist all key decision makers in the catchment. It was can be obtained by emailing necfmps@environment- produced through a wide consultation and appraisal agency.gov.uk or alternatively paper copies can be process; however it is only the first step towards an viewed at our Yorkshire offices. 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 need to review parts of the CFMP. The risk of flooding is significant within the Don CFMP area. The key sources of flood risk are fluvial and tidal flows and surface water. Analysis shows that during a one per cent probability flood from rivers, David Dangerfield 16,587 properties are at risk of flooding. Over 10,000 Yorkshire and North East Regional Director Environment Agency Don Catchment Flood Management Plan 1 Contents The purpose of a CFMP in managing flood risk 3 Catchment overview 4 Current and future flood risk 6 Future direction for flood risk management 10 Sub Areas 1 Chesterfield and River Hipper 12 2 Sheffield 14 3 Rotherham 16 4 Upper Don 18 5 Barnsley and Mexborough 20 6 Doncaster 22 7 Lower Don 23 Map of the CFMP policies 24 2 Environment Agency Don 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 for managing flood risk within the of the catchment; in the CFMP will be delivered catchment. CFMPs should be used through a combination of different • transportation planners; to inform planning and decision approaches. The following actions making by key stakeholders such as: • landowners, farmers and and their implementation will be land managers that manage subject to further appraisal and • the Environment Agency, who will and operate land for funding, and prioritised by their use the plan to guide decisions agriculture, conservation supporting evidence. The CFMP is on investment in further plans, and amenity purposes; a living document and actions will projects or actions; be updated as necessary to reflect • the public and businesses to • regional planning bodies and changing responsibilities and enhance their understanding local authorities who can use delivery mechanisms. of flood risk and how it will the plan to inform spatial be managed. planning activities and emergency planning; Figure 1 shows 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 Don Catchment Flood Management Plan 3 Catchment overview The Don catchment extends over joins the River Don upstream 1,800 square kilometres. Over of Doncaster. Downstream of 1.3 million people live within Doncaster the River Went joins the CFMP area. The upper parts the River Don. The catchment is of the catchment comprise the influenced by tidal patterns up steep-sided, well-defined valleys to Crimpsall. of the Pennine fringe, including The catchment covers 13 Local Chesterfield, Sheffield and Authorities, of which Sheffield, Barnsley. The middle reaches Barnsley, Chesterfield, Doncaster, include Rotherham and an North East Derbyshire and extensive artificially controlled Rotherham cover the greatest washlands system. The lower area. Urban land use occupies 18 part of the catchment includes per cent of the catchment and the Doncaster, the floodplain area of main settlements can be seen in the Humberhead Levels, Old Goole Map 1. The area is recognised as and the settlements of Swinefleet vital for the economy. This will see and Reedness. The Humberhead significant economic growth and Levels contain the lower reaches urban expansion. of several Main Rivers, including the Trent, Don, Torne, Went, Idle, The CFMP area has a wealth of Aire, Ouse and Derwent, and the environmental and culturally Humber estuary. The Humber is recognised sites that could be not part of this CFMP. Information affected by flooding. These include regarding the Humber can be the Peak District National Park, found in the Humber Flood Risk 39 Sites of Special Scientific Management Strategy 'Planning for Interest (SSSIs), two Special Areas Rising Tides'. of Conservation (SACs) and two Special Protection Areas SPAs. The largest main rivers in the Culturally there are 201 Scheduled catchment are the Don, Rother Monuments and 30 Registered and Dearne. The River Don and Parks and Gardens within the River Rother meet in Rotherham CFMP area. town centre and the River Dearne 4 Environment Agency Don Catchment Flood Management Plan Map 1. The location and extent of the Don CFMP area Environment Agency Don Catchment Flood Management Plan 5 Current and future flood risk Overview of the current flood risk What is at risk? Flood risk has two components: The water catchment cuts across Within the Don catchment there the chance (probability) of a Regional boundaries into Derbyshire are 16587 properties at risk particular flood and the impact and this is largely coincident from a one per cent proabaility (or consequence) that the flood with Sheffield City region area of flood from rivers, without taking would have if it happened. The influence. into account flood defences. probability of a flood relates to Additionally, over 10000 Currently the main sources of flood the likelihood of a flood of that properties are identified as at risk risk within the catchment are: size occurring within a one year during the 0.5 per cent tidal event. period, it is expressed as a • rapid river flooding in urban There are over 530 separate flood percentage. For example, a one watercourses; defence structures that reduce the per cent flood has a one per cent probability of flooding in some chance or 0.01 probability of • surface water drainage and communities. occurring in any one year. sewers has the potential to effect most urban areas in the The analysis of flooding to As part of the CFMP process, we catchment but has been recorded environmental sites shows there have developed a catchment wide in Sheffield and Chesterfield; are 14 SSSI, 6.7 square kilometres broadscale model to determine of SAC and 6.6 square kilometres the risk of flooding from main • from tidal sources downstream of SPA are at risk during a one per and non-main rivers, if defences of Crimpsall and can effect cent probability flood.