Members’ Library Service Request Form Date of Document 01/11/19 Originator Jacobs Originator’s Ref (if any) Document Title MFPS Preferred Scheme Please indicate if access to the document is to be “unrestricted” or “restricted”, with regard to the terms of the Local Government (Access to Information) Act 1985. Unrestricted Restricted If the document is “restricted”, please state on what grounds (click on grey area for drop- down menu): For Publication Additional information: Links to a report to Cabinet on 21 January re the Musselburgh Flood Protecction Scheme Authorised By Tom Reid Designation Head of Infrastructure Date 21/01/20 For Office Use Only: Library Reference 10/20 Date Received 22/01/20 Bulletin Jan 20 Musselburgh Flood Protection Scheme Preferred Scheme Report MFPS-JEC-S3-XXX-XXX-RE-Z-0002 | version 0.1 November 2019 East Lothian Council Document Ti tle Preferred Scheme Report Musselburgh Flood Protection Scheme Project No: 701909 Document Title: Preferred Scheme Report Document No.: MFPS-JEC-S3-XXX-XXX-RE-Z-0002 Revision: Version 0.1 Date: November 2019 Client Name: East Lothian Council Client No: CON-17-025 Project Manager: Kirsteen Nixon Author: Elaine Hood File Name: \\glafpp01\Projects2\Water\701909 - Musselburgh FPS\2_Working Folders\2_Documents\Stage 3\Option Appraisal\Preferred Scheme Report\MFPS_Preferred Scheme Report_v0.1 DRAFT_ISSUE2.docx Jacobs U.K. Limited 95 Bothwell Street Glasgow, Scotland G2 7HX United Kingdom T +44 (0)141 243 800044 www.jacobs.com © Copyright 2019 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 document 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 document by any third party. Document history and status Version Date Description By Review Approved 0.1 Nov 2019 Draft for Client review Various KN SV Document No. i Preferred Scheme Report Contents Executive Summary .............................................................................................................................................. 1 1. Introduction ............................................................................................................................................... 2 1.1 Purpose ....................................................................................................................................................... 2 1.2 Background and Sources of Flooding ......................................................................................................... 2 1.3 Scheme objectives ...................................................................................................................................... 4 1.3.1 General Objectives ..................................................................................................................................... 4 1.3.2 Economic Objectives .................................................................................................................................. 4 1.3.3 Hydraulic Objectives ................................................................................................................................... 4 1.3.4 Technical Objectives ................................................................................................................................... 5 1.3.5 Environmental Objectives ........................................................................................................................... 5 1.3.6 Social and Cultural Objectives .................................................................................................................... 5 1.3.7 Regeneration Objectives............................................................................................................................. 6 1.4 Flood Protection Scheme Process ............................................................................................................. 6 1.5 Outline programme ..................................................................................................................................... 6 1.6 Existing information ..................................................................................................................................... 7 1.7 Additional information requirements ........................................................................................................... 7 2. Option appraisal ........................................................................................................................................ 9 2.1 Guidance and tools ..................................................................................................................................... 9 2.2 Summary of approach to Musselburgh FPS ............................................................................................... 9 2.3 Factors influencing the option appraisal ................................................................................................... 10 2.3.1 Economics ................................................................................................................................................ 10 2.3.2 Hydrology and hydraulic modelling ........................................................................................................... 11 2.3.2.1 Standard of Protection .............................................................................................................................. 11 2.3.2.2 Hydrological assessment .......................................................................................................................... 11 2.3.2.3 Coastal Flood Risk .................................................................................................................................... 14 2.3.2.4 Hydraulic modelling ................................................................................................................................... 18 2.3.2.5 Freeboard / residual uncertainty allowance .............................................................................................. 22 2.3.3 Engineering ............................................................................................................................................... 22 2.3.3.1 Ground conditions and geotechnical risks ................................................................................................ 23 2.3.3.2 Existing structures ..................................................................................................................................... 24 2.3.3.3 Services and utilities ................................................................................................................................. 26 2.3.4 Consultation .............................................................................................................................................. 27 2.3.5 Environment .............................................................................................................................................. 29 2.3.5.1 Preliminary Environmental Appraisal ........................................................................................................ 29 2.3.5.2 Ecology Surveys ....................................................................................................................................... 30 2.3.5.3 Potential Scheme Impacts ........................................................................................................................ 34 2.3.5.4 EIA screening and scoping ....................................................................................................................... 36 Document No. ii Preferred Scheme Report 2.3.6 Health and safety ...................................................................................................................................... 36 2.3.7 Interface with other projects ...................................................................................................................... 37 2.4 Developing the long list of options ............................................................................................................ 37 2.4.1 Defining flood cells .................................................................................................................................... 37 2.4.2 Initial brainstorming ................................................................................................................................... 38 2.4.3 ‘Do nothing’ and ‘do minimum’ options ..................................................................................................... 39 2.4.4 Catchment-wide flood mitigation measures .............................................................................................. 40 2.4.4.1 Flood warnings and awareness ................................................................................................................ 40 2.4.4.2 Property Level Protection (PLP) ............................................................................................................... 40 2.4.4.3 Property Level Resilience