River Calder Catchment Flood Management Plan

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Calder 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 Calder Catchment Flood Management Plan (CFMP). This CFMP gives an overview of the flood risk in the Calder catchment and sets out our preferred plan for sustainable flood risk management over the next 50 to 100 years. The Calder CFMP is one of 77 CFMPs for England and canals, groundwater, surface water, mine water and Wales. Through the CFMPs, we have assessed inland sewers. Almost 21,000 properties have a one per flood risk across all of England and Wales for the first cent chance of flooding each year if there were no time. The CFMP considers all types of inland flooding, defences in place.. Flooding from other sources such from rivers, ground water, surface water and tidal as groundwater, canals and mines, is not as closely flooding, but not flooding directly from the sea monitored, mitigated or recorded, and so the risk (coastal flooding), which is covered by Shoreline posed from these sources is not fully evaluated. Management Plans (SMPs). Our coverage of surface We cannot reduce flood risk on our own, we will and ground water is however limited due to a lack therefore work closely with all our partners to improve of available information. the co-ordination of flood risk activities and agree the The role of CFMPs is to establish flood risk management most effective way to manage flood risk in the future. policies which will deliver sustainable flood risk We have worked with others including Planning and management for the long term. This is essential if Local Authorities, Yorkshire Water, British Waterways , we are to make the right investment decisions for Internal Drainage Boards (IDBs) and Natural England to the future and to help prepare ourselves effectively develop this CFMP. for the impact of climate change. We will use CFMPs This is a summary of the main CFMP document, if you to help us target our limited resources where the need to see the full document an electronic version risks are greatest. can be obtained by emailing necfmps@environment- This CFMP identifies flood risk management policies agency.gov.uk or alternatively paper copies can be to assist all key decision makers in the catchment. viewed at our Yorkshire offices. It was produced through a wide consultation and appraisal process; however it is only the first step towards an 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. There is a long history of flooding within the Calder David Dangerfield CFMP area. Flooding has been reported from rivers, Yorkshire and North East Regional Director Environment Agency Calder Catchment Flood Management Plan 1 Contents The purpose of a CFMP in managing flood risk 3 Sub Areas 1 Calder Headwaters 12 Catchment overview 4 2 Ryburn and Hebble Brook 13 Current and future flood risk 6 3 Brighouse and Greetland 14 Future direction for flood risk management 10 4 Spen 16 5 Mid Calder 18 6 Colne, Holme and Fenay Beck 20 7 Wakefield 22 8 Lower Calder 23 Map of the CFMP policies 24 2 Environment Agency Calder 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 Calder Catchment Flood Management Plan 3 Catchment overview The River Calder catchment The Calder catchment has a covers just under 950 square wealth of environmentally kilometres. The River Calder flows important sites. This includes for approximately 72 kilometres part of the South Pennine Moors from its source, 400 metres above which includes two Special sea level at Heald Moor, near Protection Areas (SPA) and a Todmorden to its confluence with Special Area for Conservation the River Aire near Castleford. (SAC) designation. Additionally Nearly 770,000 people live within the Denby Grange Colliery Ponds the CFMP area. SAC lies entirely within the Calder Catchment. There are also 11 The headwaters of the catchment Sites of Special Scientific Interest are characterised by swift-flowing (SSSI) throughout the catchment. upland streams which then flow Many of the urban areas have through a series of former mill an industrial past; this has towns nestling in narrow valley left a legacy of historical sites bottoms. Below Wakefield, the including over 60 Scheduled River Calder follows through a Monuments and 10 registered gentle meandering course through parks and gardens. a broad floodplain where it joins the River Aire. Within this low Within the middle part of the lying section of the River Calder, catchment there are large urban there is important agricultural areas. The upper reaches of the land. The quality of the land rises catchment are characterised to between Grade 2 and Grade 3 by steep valley sides with meaning the land quality is very development located within good to moderate. the restricted floodplain. The Calder catchment is generally The Calder catchment is linked urbanised with the major to the Sheffield and Leeds city concentrations of population region initiative. In the future within the city of Huddersfield there will be extensive economic and the towns of Dewsbury, growth targeted toward the Halifax, Todmorden and area resulting in significant Wakefield. Because of this, the pressure for development area contains many important and regeneration. transport routes and community assets such as hospitals, gas and electricity installations and emergency services. 4 Environment Agency Calder Catchment Flood Management Plan Map 1. The location and extent of the Calder CFMP area River Calder flows through Wakefield Environment Agency Calder 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: Currently the main sources of Within the Calder catchment there the chance (probability) of a flood risk for people, property, are just under 21,000 properties particular flood and the impact (or infrastructure and the land are: at risk from a one per cent flood, consequence) that the flood would without taking into account • flooding from rivers, have if it happened. The probability current flood defences. There are throughout the CFMP area, of a flood relates to the likelihood of approximately 52 kilometres of with concentration of risk a flood of that size occurring within flood defences that reduce the in the urban communities a one year period, it is expressed probability of flooding throughout of Hebden Bridge, Elland, as a percentage. For example, a the catchment including at Huddersfield, Dewsbury one per cent flood has a one per Todmorden, Copley, Brighouse and and Wakefield; cent chance or 0.01 probability Wakefield. of occurring in any one year. • surface water drainage and There are also over 300 properties sewer flooding, which have The flood risks quoted in this report at significant risk of surface water been recorded in Mirfield, are the undefended one per cent flooding. Wakefield, Todmorden, flood figures. They are taken from Hebden Bridge and in the There are parts of two SPA, one broadscale mathematical models; Colne catchment.
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