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Local Flood Risk Management Strategy April 2013 1 Local Flood Risk Management Strategy Wrexham County Borough Council Document Control Sheet Document Author: Charlotte Beattie Line Manager: Phil Harrison Revision History Date Version No Summary of Changes 22.10.12 2.2 General amendments and grammar 1.11.12 2.3 Final version 7.1.13 3.0 Final version following Consultation 18.4.13 3.1 Welsh Government Minor Amendments Approvals Approved by Signature Date Version Charlotte Beattie 16.1.13 3.0 Charlotte Beattie 18.4.13 3.1 Distribution: Publication Name Title Date Version Cadw; John Berry 18.4.13 3.1 Countryside Council for Theresa Kudelska 18.4.13 3.1 Wales Environment Agency Keith Ivens 18.4.13 3.1 Wales Linda Thomas Clwyd Powys Mark Walters 18.4.13 3.1 Archaeological Trust English Heritage; Judith Nelson 18.4.13 3.1 Natural England; General Consultations 18.4.13 3.1 Welsh Water Dwr Cymru Dominic Scott and Gemma 18.4.13 3.1 Roberts Dee Valley Water Morgan Thomas 18.4.13 3.1 Wales and West Stephen Magee 18.4.13 3.1 Scottish Power Linda Lewis 18.4.13 3.1 Severn Trent Tim Smith 18.4.13 3.1 Strategic Flood Group for 18.4.13 3.1 Wrexham CBC Trunk Road Agency David Cooil 18.4.13 3.1 The five adjoining local Sandra Carlisle Graham Astley 18.4.13 3.1 authorities of Cheshire Wayne Hope, Neil Parry, West and Chester; [email protected] Powys, Shropshire, Denbighshire and Flintshire; Canal and River Trust Alison Truman and Lucas Brown 18.4.13 3.1 (Formerly British Waterways); April 2013 Version 3.1 2 Local Flood Risk Management Strategy Wrexham County Borough Council Forestry Commission; [email protected] 18.4.13 3.1 Lead Local Member; Cllr Mark Pritchard 18.4.13 3.1 North East Wales Flood Cllr Michael Edwards 18.4.13 3.1 Risk Management Wales (FRMW) Member; Wrexham Local Planning Lawrence Isted- 18.4.13 3.1 Authority Head of Community Wellbeing and Development United Utilities Not sent-No contact details 18.4.13 3.1 Network Rail (NR) Claire Wise 18.4.13 3.1 BRB Kevin Giles 18.4.13 3.1 British Telecom Not sent-No contact Details 18.4.13 3.1 Welsh Government Paul Critchley 18.4.13 3.1 General Public 18.4.13 3.1 WLGA Neville Rookes 18.4.13 3.1 18.4.13 3.1 Welsh Government Final submission of documents to 18.4.13 3.1 Jo Larner and Paul Critchley Wrexham Copyright. All Rights Reserved. The information contained in this document can be made available in alternative formats: large print, braille, audio tape or on disc. We can also translate this document into other languages. April 2013 Version 3.1 3 Local Flood Risk Management Strategy Wrexham County Borough Council Contents Page Executive Summary 5 Introduction 6 Risk Management Authorities and Function 10 Local Flood Risk Management Principles and Objectives 14 Proposed Measures 17 Assessment of Local Flood Risk 20 Implementation (Costs and Benefits) 27 Funding 41 Environmental Objectives (Other Plans and Programmes) 43 Review and Monitoring 45 Annexe A: Sources of Flood Risk Annexe B Wrexham County Council Lead Local Flood Authority Strategic Flood Group Annexe C LLFA Policy on Culverting Annexe A: Sources of Flood Risk Annexe D: Source Control Sustainable Drainage Systems Annexe E: Environment Agency: Prepare your Property Annexe F: Other sources of Information Annexe G: Glossary of Terms April 2013 Version 3.1 4 Local Flood Risk Management Strategy Wrexham County Borough Council Executive Summary The Local Flood Risk Management Strategy for Wrexham County Borough Council sets out its principles, objectives and measures for the management of local flood risk. Local flood risk is defined as “surface water run off, ground water and ordinary watercourses and included any lake, pond or other body of water that feeds from an ordinary watercourse. The responsibilities associated with this flood risk management, take the form of either statutory duties or permissive powers derived from the Flood and Water Management Act 2010 and Flood Risk Regulations 2009. Implementation of these duties and powers are reflected in the proposed measures set out in Figure 1.6 for the Local Flood Risk Management Strategy. It is Wrexham’ County Borough Council’s role as a new Lead Local Flood Authority (LLFA) to allocate sufficient funding for the implementation of these measures. The Local Flood Risk Strategy sets out measures specific to the assessment of local flood risk associated with the Preliminary Flood Risk Assessments or PFRA’s. The measures cut across departments of the Council and are reflective of the need for a cross disciplinary approach and benefits attributed to flood risk management. The Local Flood Risk Strategy is based on the core principles of sustainable development and accords to the objectives of the National Flood and Coastal Risk Management Strategy for Wales. In the absence of a Local Flood Risk Management Strategy there will be no strategic approaches applied to flood risk management. The co-ordination of the roles associated with flood risk measures are likely to duplicate or exacerbate local flood risk issues which are predicted to increase over the next twenty five years and beyond with heavy rainfall and changeable weather associated with climate change. April 2013 Version 3.1 5 Local Flood Risk Management Strategy Wrexham County Borough Council Introduction The Flood and Water Management Act 20101 places the responsibility for “local flood risk” which is defined as flooding arising from ordinary watercourses, including a lake, pond or other area of water, surface run-off and groundwater for Wrexham County Borough Council as a Lead Local Flood Authority (LLFA). The risk, of flood risk as referred to in the National Strategy is calculated by taking the likelihood (i.e. chance of flooding or coastal erosion) and multiplying it by the consequences (i.e. impacts of the flooding or coastal erosion). The likelihood of an event is usually expressed as either a percentage of probability or an annual chance in any one year, for example as 1% annual probability of flooding or a 1 in 100 chance of flooding at a location in any one year. The likelihood of flooding depends on factors, which includes weather patterns, geology, topography and land use. The consequences of flooding events may vary and in each case consequences of the events differ. All flooding and coastal erosion events carry a risk to life either for those directly affected or for those attempting to help those directly affected. Consequences can include damage to buildings and structures, the deposition of sewerage and debris in properties and streets, damage and impassable network infrastructure, loss of livestock and agricultural land and impacts on key infrastructure (such water supply treatment works and pumping stations and sewerage treatment works as utility stations, hospitals, fire stations, ambulance, police stations and transport systems including road and rail) and the environment in regards to water quality and ecology and the cultural and landscape heritage of places. The Flood and Water Management Act (2010) Part 1 subsection (1) defines “Flood” to include any case where land not normally covered by water becomes covered by water. It does not matter for the purposes of subsection (1) whether the flood is caused by heavy rainfall, a river overflowing or its banks being breached; a dam overflowing or being breached; tidal waters; ground water or anything else including a combination of factors. It also states that “Flood” does not include (3) (a)) a flood from any part of the sewerage systems, unless wholly or partly caused by an increase in the volume of rainwater (including snow and other precipitation entering or otherwise affecting the system or (b) a flood caused by a burst water main (within section 219 of the Water Industry Act 1991) For Lead Local Flood Authorities to assess the risks and consequences of local flood risk, the Flood and Water Management Act (2010) places a number of statutory duties and powers which link and build on to the Flood Risk Regulations 20092 . These duties and powers inform the measures set out in this strategy will need to accord with the objectives of the National Flood Risk Management Strategy for Wales. Figure 1.0 below sets out the main form of these responsibilities. 1 Flood and Water Management Act 2010: http://www.legislation.gov.uk/ukpga/2010/29/contents 2 Flood Risk Regulations 2009, available from; http://www.legislation.gov.uk/uksi/2009/3042/contents/made April 2013 Version 3.1 6 Local Flood Risk Management Strategy Wrexham County Borough Council Figure 1.0 Wrexham County Borough Council Lead Local Flood Authority Responsibilities The Flood and Water Management Act 2010 places a number of statutory duties on Local Authorities in their new role as LLFA including: ° the preparation of local flood risk management strategies; ° a duty to comply with the National Strategy; ° to co-operate with other authorities, including sharing data; ° a duty to investigate all flooding within its area, insofar as a LLFA consider it necessary or appropriate ° a duty to maintain a register of structures and features likely to affect flood risk; and ° a duty to contribute to sustainable development. ° role of approving, adoption and maintenance of sustainable drainage systems; ° Ordinary Watercourse Consents; In addition to these each LLFA has a number of what are called permissive powers. These are powers that allow them to do something, but do not compel them to and include: ° powers to request information; ° powers to designate certain structures or features that affect flood or coastal erosion risk; ° the expansion of powers to undertake works to include broader risk management actions; and ° the ability to cause flooding or coastal erosion under certain conditions; Under section 10 of the Flood and Water Management Act 2010 Lead Local Flood Authorities have a statutory requirement to develop, maintain apply and monitor a Local Flood Risk Management Strategy (LFRMS) The strategy importantly draws together the work programme of the Flood Group of the North Wales Resilience Forum.