Section 19 Investigation Report
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Section 19 Investigation Report Stockport Metropolitan Borough Council June 2016 Flood Events D02 | V02 December 2016 131251 June 2016 Flo od Eve nts Stockpor t M etro polita n Bor oug h Cou ncil June 2016 Flood Events Section 19 Investigation Report Project No: B2278700 Document Title: June 2016 Flood Events Document No.: D02 Revision: V02 Date: December 2016 Client Name: Stockport Metropolitan Borough Council Client No: 131251 Project Manager: Chris Isherwood Author: Tim Diesner File Name: 2016-12-07_B2278700_S19InvestigationReport_Wrk_V10.docx Jacobs U.K. Limited 4th Floor, Metro 33 Trafford Road Salford M5 3NN United Kingdom T +44 (0)161 873 8500 F +44 (0)161 873 7115 www.jacobs.com © Copyright 2016 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 Review Approved D01 19/10/2016 Draft report issued to client for comment T Diesner C Isherwood C Isherwood D02 09/12/2016 Draft report issued to client for comment T Diesner C Isherwood C Isherwood D02 i June 2016 Flood Events Contents 1. Introduction ..........................................................................................................................................1 1.1 Flood Event Overview ............................................................................................................................1 1.2 Section 19 Investigation Requirements ...................................................................................................2 1.3 Purpose .................................................................................................................................................2 1.4 Relevant Risk Management Authorities ..................................................................................................3 2. Overview of Flood Events ....................................................................................................................5 June 2016 ..............................................................................................................................................5 2.1 5 2.2 Property Impacts ....................................................................................................................................7 2.3 EA Flood Alerts .................................................................................................................................... 12 3. Bramhall Green .................................................................................................................................. 13 3.1 Site Overview & Flooding Impacts ........................................................................................................ 13 3.2 Flooding Analysis ................................................................................................................................. 13 3.3 RMA Responses .................................................................................................................................. 16 4. Hazel Grove ........................................................................................................................................ 17 4.1 Site Overview & Flooding Impacts ........................................................................................................ 17 4.2 Flooding Analysis ................................................................................................................................. 18 4.3 RMA Responses .................................................................................................................................. 21 5. Offerton Green ................................................................................................................................... 22 5.1 Site Overview & Flooding Impacts ........................................................................................................ 22 5.2 Flooding Analysis ................................................................................................................................. 23 5.3 RMA Responses .................................................................................................................................. 25 6. Edgeley ............................................................................................................................................... 27 6.1 Site Overview & Flooding Impacts ........................................................................................................ 27 6.2 Flooding Analysis ................................................................................................................................. 27 6.3 RMA Responses .................................................................................................................................. 29 7. Reddish .............................................................................................................................................. 30 7.1 Site Overview & Flooding Impacts ........................................................................................................ 30 7.2 Flooding Analysis ................................................................................................................................. 30 7.3 RMA Responses .................................................................................................................................. 31 8. Cheadle ............................................................................................................................................... 32 8.1 Site Overview & Flooding Impacts ........................................................................................................ 32 8.2 Flooding Analysis ................................................................................................................................. 32 8.3 RMA Responses .................................................................................................................................. 33 9. Heald Green ........................................................................................................................................ 34 9.1 Site Overview & Flooding Impacts ........................................................................................................ 34 9.2 Flooding Analysis ................................................................................................................................. 34 9.3 RMA Responses .................................................................................................................................. 35 10. Other Local Incidents and Impacts ................................................................................................... 37 10.1 Local Property Impacts ......................................................................................................................... 37 10.2 Infrastructure Impacts........................................................................................................................... 40 D02 ii June 2016 Flood Events 11. Recommended & Ongoing Actions ................................................................................................... 42 11.1 Recommended & Ongoing Actions across Stockport ............................................................................ 42 11.2 Next Steps ........................................................................................................................................... 43 12. Conclusion ......................................................................................................................................... 44 D02 iii June 2016 Flood Events 1. Introduction 1.1 Flood Event Overview In June 2016, the borough of Stockport received approximately double the long-term average amount of rainfall through prolonged and intense rainfall. On ground already saturated through May, this resulted in three noticeable flood events across many areas of Stockport on the 8, 11 and 16 June. On the 8 June, extreme rainfall overloaded local drains and sewers, which caused surface water flooding that affecting 102 properties, with the worst affected areas including Offerton Green, Reddish and Cheadle. Three days later on the 11 June, prolonged and heavy rainfall caused river levels to rise and local drainage systems to become overwhelmed affecting Bramhall Green, Hazel Grove, Heald Green and again in Offerton Green, with a total of 186 properties affected. Later on the 16 June, a third intense rainfall event also overloaded local drains and sewers, principally in Edgeley and Cheadle. During the event, surface water flooding affected 77 properties. As a result, 291 properties suffered internal and external flooding, with some properties flooded on more than one occasion. A number of roads also became impassable (See Figure 1.1) and a landslip caused significant disruption to the local railway network. Stockport Metropolitan Borough