Section 19 Investigation Report Stockport Metropolitan Borough Council
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Section 19 Investigation Report Stockport Metropolitan Borough Council June 2016 Flood Events D01 | V01 October 2016 131251 June 2016 Fl ood Events Stockport Metr opolitan Borough Council June 2016 Flood Events Section 19 Investigation Report Project No: B2278700 Document Title: June 2016 Flood Events Document No.: D01 Revision: V01 Date: October 2016 Client Name: Stockport Metropolitan Borough Council Client No: 131251 Project Manager: Chris Isherwood Author: Tim Diesner File Name: 2016-10-19_B2278700_S19InvestigationReport_D01.docx Ja cobs 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 D01 i June 2016 Flood Events Contents 1. Introduction ................................................................................................................................................ 1 1.1 Summary of Events ..................................................................................................................................... 1 1.2 Purpose & Scope of this Report .................................................................................................................. 1 1.3 Legislative Background ............................................................................................................................... 1 1.4 Risk Management Authorities ..................................................................................................................... 2 2. Overview of Flooding Events ................................................................................................................... 4 2.1 Property Impacts ......................................................................................................................................... 4 2.2 Conditions during June 2016 ....................................................................................................................... 5 2.3 EA Flood Alerts ............................................................................................................................................ 8 3. Bramhall ..................................................................................................................................................... 9 3.1 Site Overview & Flooding Impacts .............................................................................................................. 9 3.2 Flooding Analysis ........................................................................................................................................ 9 3.3 RMA Responses ........................................................................................................................................ 12 3.4 Recommended Actions ............................................................................................................................. 13 4. Hazel Grove .............................................................................................................................................. 14 4.1 Site Overview & Flooding Impacts ............................................................................................................ 14 4.2 Flooding Analysis ...................................................................................................................................... 15 4.3 RMA Responses ........................................................................................................................................ 17 4.4 Recommended Actions ............................................................................................................................. 18 5. Offerton Green ......................................................................................................................................... 19 5.1 Site Overview & Flooding Impacts ............................................................................................................ 19 5.2 Flooding Analysis ...................................................................................................................................... 20 5.3 RMA Responses ........................................................................................................................................ 22 5.4 Recommended Actions ............................................................................................................................. 23 6. Edgeley ..................................................................................................................................................... 24 6.1 Site Overview & Flooding Impacts ............................................................................................................ 24 6.2 Flooding Analysis ...................................................................................................................................... 24 6.3 RMA Responses ........................................................................................................................................ 26 6.4 Recommended Actions ............................................................................................................................. 26 7. Other Incidents ........................................................................................................................................ 27 7.1 High Lane .................................................................................................................................................. 27 7.2 Infrastructure Impacts ................................................................................................................................ 27 8. Conclusion ............................................................................................................................................... 28 D01 ii June 2016 Flood Events 1. Introduction 1.1 Summary of Events Localised flooding occurred across many areas of Stockport during June 2016 following periods of heavy downpours. As a result, numerous properties suffered internal and external flooding, many roads became impassable and were closed, and a landslip caused significant disruption to the local railway network. Three key flooding events have been identified and took place on: 8 June 2016 – impacting Offerton Green 11 June 2016 – impacting Bramhall, Hazel Grove, Offerton Green, High Lane 16 June 2016 – impacting Edgeley High river levels and overwhelmed surface water drainage systems as a result of prolonged and heavy rainfall saw the flooding of 141 properties across Stockport on 11 June, 86 of which suffered internal flooding. Heavy rainfall also overwhelmed local drainage systems on both 8 June and 16 June, however, the flooding impacts were much less severe with 17 properties on 8 June and 3 properties on 16 June suffered internal flooding. 1.2 Purpose & Scope of this Report Given that the flooding events across June 2016 affected a large number of residential properties and critical infrastructure such as rail links, bridges and ‘A’ roads, it is classified as a ‘significant’ event under Stockport’s Local Flood Risk Management Strategy (LFRMS)1 and therefore a full investigation is required. The aim of this investigation is to identify all the communities that were affected by the June 2016 flooding events and to determine the source, cause and impact of the events (in accordance with Section 19 of the Flood and Water Management Act 2010 (the Act)). The study will also seek to investigate certain issues of local concern regarding flood risk, such as the impact of development outside of Stockport on flood risk within the borough and the impact of the A6 to Manchester Airport Relief Road (A6MARR), which is currently under construction. Recommendations arising from the investigation will be made to Stockport Metropolitan Borough Council (SMBC) and the other Risk Management Authorities (RMAs) within the borough. 1.3 Legislative Background 1.3.1 Section 19 Investigations The Act places a number of duties on Lead Local Flood Authorities (LLFAs) in relation to local flood risk management. One of the principal duties of the LLFAs, as laid out in the Act, is the responsibility to record and investigate flooding incidents within their area (known as Section 19 Investigations). Section 19 of the Act states: 1) On becoming aware of a flood in its area, a lead local flood authority must, to the extent that it considers it necessary or appropriate, investigate – a) Which risk management authorities have relevant flood risk management functions, and b) Whether each of those risk management authorities has exercised, or is proposing to exercise, those functions in response to the flood. 2) Where an authority carries