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Kirklees Flood Risk Management Studies 2015/16 Kirklees Council Kirklees Flood Risk Management Studies 2015/16 Kirklees Council Mirfield and Ravensthorpe Fluvial Viability Study B2088200/ MRFVS /00 October 16 Flood Risk Assessment Lancashire C ounty Council Mirfield and Ravensthorpe Fluvial Viability Study Mirfield and Ravensthorpe Fluvial Viability Study Project no: B2088200 Document title: Mirfield and Ravensthorpe Fluvial Viability Study Document No.: B2088200/MRFVS/00 Revision: 00 Date: October 16 Client name: Kirklees Council Project manager: A Pearson Author: M Miles File name: B2088200_Kirklees_MirfieldRavensthorpe_FluvialViabilityStudy_D00_V00.docx Jacobs U.K. Limited 1 City Walk Leeds, West Yorkshire LS11 9DX United Kingdom T +44 (0)113 242 6771 F +44 (0)113 389 1389 www.jacobs.com © Copyright 2015 Jacobs U.K. Limited. The concepts and information contained in this document are the property of Jacobs. Use or copying of this document in whole or in part without the written permission of Jacobs constitutes an infringement of copyright. Limitation: This report has been prepared on behalf of, and for the exclusive use of Jacobs’ Client, and is subject to, and issued in accordance with, the provisions of the contract between Jacobs and the Client. Jacobs accepts no liability or responsibility whatsoever for, or in respect of, any use of, or reliance upon, this report by any third party. Document history and status Revision Date Description By Check Review Approved 00 25 October 2016 Initial Draft M Miles A Perryman C Isherwood A Pearson B2088200/HVS_OTN/00 i Mirfield and Ravensthorpe Fluvial Viability Study Contents 1. Introduction ................................................................................................................................................ 1 1.1 Background ................................................................................................................................................. 1 1.2 Location ....................................................................................................................................................... 2 1.3 History of Flooding ....................................................................................................................................... 3 2. Problem Identification ............................................................................................................................... 5 2.1 Existing Flood Risk Information ................................................................................................................... 5 2.2 Flood Mechanisms ...................................................................................................................................... 7 2.3 Flood Damages ......................................................................................................................................... 17 3. Flood Risk Management Options .......................................................................................................... 23 3.1 Long List .................................................................................................................................................... 23 3.2 Shortlist ...................................................................................................................................................... 23 3.3 Economic Appraisal ................................................................................................................................... 29 4. Conclusions and Recommendations .................................................................................................... 34 4.1 Conclusion ................................................................................................................................................. 34 4.2 Recommendations ..................................................................................................................................... 35 Appendix A. Economic Methodology Appendix B. Options Appraisal B2088200/HVS_OTN/00 ii Mirfield and Ravensthorpe Fluvial Viability Study 1. Introduction 1.1 Background Kirklees Council and the Environment Agency have commissioned Jacobs to undertake a Viability Study to investigate opportunities to manage the flood risk from fluvial sources across Mirfield and Ravensthorpe. In March 2014, Kirklees Council produced a prioritisation analysis of their administrative area and identified high-risk areas susceptible to fluvial and surface water flooding. The analysis ranked clusters of properties at risk of flooding in a priority order based upon the risk to property, life, transport links and critical infrastructure. One cluster covering Mirfield was ranked 20th in the prioritised list with an estimated 34 properties at risk around Parkfield Crescent. Three clusters covering Ravensthorpe were ranked 38th, 40th and 43rd with an estimated 36, 35 and 32 properties at risk in close proximity around Kingfisher Crescent, Walker Street and Victoria Street respectively. Clusters within Mirfield and Ravensthorpe have been identified as being at risk of surface water flooding from a local Ordinary Watercourse and from pluvial flooding. From a desktop study of Mirfield and Ravensthorpe, further properties were identified as being at risk of fluvial flooding based on the Environment Agency Flood Zones and National Receptor Database (NRD). This study has therefore been prepared to identify and assess the existing flooding mechanisms from fluvial sources to Mirfield and Ravensthorpe and the immediate surrounding area. If properties are confirmed to be at significant risk, the study will assess options to reduce the risk, which Kirklees Council can look to implement. A parallel surface water study is being undertaken by Jacobs and can be read in conjunction with this study to provide a greater understanding of the interaction between the fluvial and surface water flood risks. 1.1.1 Aims and Objectives The overall aims of this Viability Study are to: Improve the local understanding of fluvial flood risk; Evaluate the current risk to properties in Mirfield and Ravensthorpe; and Identify potential viable solutions to reduce local fluvial flood risk. In order to meet these aims, the following objectives are to: Present the current fluvial flooding mechanisms; Present economic damages and Benefit Cost Ratio (BCR) values; Summarise the affordable options for Mirfield and Ravensthorpe; and Produce recommendations for Kirklees Council moving forward. In order to achieve these aims and objectives, this Viability Study uses a number of flood risk datasets that have been made available by Kirklees Council and the Environment Agency. Whilst these datasets are appropriate given the level of this study, they may contain a number of limitations and assumptions, which may over or under estimate actual flood risks as a result. Where possible local information collected on site will be used to supplement these datasets, but where limitations or assumptions remain, these will be clearly identified. Consequently, it is not the intention of this Viability Study to identify a preferable FRM solution. The study however seeks to provide Kirklees Council with sufficient information to confirm its ranking within the table of flood risk hotspots and to assess whether the area warrants further investigation (given other FRM priorities). Where this is the case, this report will set out clear recommendations and actions. B2088200/HVS_OTN/00 1 Mirfield and Ravensthorpe Fluvial Viability Study 1.2 Location The Viability Study focuses on Mirfield and Ravensthorpe, which are two separate urban locations connected through the A644 Huddersfield Road Corridor located in the north east of the Kirklees Metropolitan Borough area. Dewsbury town centre is located approximately 1.5km to the east. Huddersfield town centre is located approximately 5km to the west and lies upstream of Mirfield and Ravensthorpe. There are two Environment Agency classified Main Rivers, the River Calder and the River Spen, of which the River Calder is a source of flooding to Mirfield and Ravensthorpe, whilst the River Spen, in terms of flood risk, would only directly affect Ravensthorpe. Mirfield lies to the west of Ravensthorpe and is built on the north side of the Calder valley, on a steep hillside. A section of the town has been constructed on the floodplain of the River Calder and these mostly include non- residential properties. Topography varies in Mirfield from 29m to 125m AOD and Ravensthorpe from 29-50m AOD. Ravensthorpe is less undulating and smaller than Mirfield and is situated at the confluence of the River Calder and the River Spen. Figure 1.1 shows the site overview map. Mirfield and Ravensthorpe’s close proximity to one another means that fluvial flood events affecting one would likely affect the other and any flood risk management options shortlisted would have to consider its potential effects upstream or downstream of their implementation. Consequently, both locations are assessed as part of this Viability Study. Figure 1.1 – Mirfield & Ravensthorpe Site Overview Map B2088200/HVS_OTN/00 2 Mirfield and Ravensthorpe Fluvial Viability Study 1.3 History of Flooding There are numerous records of historical flooding in Mirfield and Ravensthorpe with the most recent reported event occurring on the 26th December 2015, which affected large parts of Kirklees. Table 1.1 provides a non- exhaustive list of historical records, which have affected Mirfield and Ravensthorpe. Figure 1.2 illustrates the recent
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