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Mark Stevenson Report Chelmsford City Council Water Cycle Study 2016-11-17

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Mark Stevenson Report Chelmsford City Council Water Cycle Study 2016-11-17 FINAL BDC/050 Braintree District Council Water Cycle Study Braintree District Council March 2017 Braintree District Council Water Cycle Study FINAL Quality information Prepared by Checked by Approved by Craig Boorman Gemma Hoad Carl Pelling Hydrology Consultant Senior Water Consultant Associate Director Mark Stevenson Graduate Water Consultant Revision History Revision Revision date Details Authorized Name Position 0.3 December 2016 Draft JR Jon Robinson Director 1.0 March 2017 Final CP Carl Pelling Associate Director Prepared for: Braintree District Council Prepared by: Craig Boorman Hydrology Consultant Mark Stevenson Graduate Water Consultant AECOM Infrastructure & Environment UK Limited Midpoint Alencon Link Basingstoke Hampshire RG21 7PP UK T: +44(0)1256 310200 aecom.com March 2017 AECOM 2 Braintree District Council Water Cycle Study FINAL Limitations AECOM Infrastructure & Environment UK Limited (“AECOM”) has prepared this Report for the sole use of Braintree District Council (“Client”) in accordance with the Agreement under which our services were performed (“Braintree DC WCS Tender FINAL”). No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by AECOM. The conclusions and recommendations contained in this Report are based upon information provided by others and upon the assumption that all relevant information has been provided by those parties from whom it has been requested and that such information is accurate. Information obtained by AECOM has not been independently verified by AECOM, unless otherwise stated in the Report. The methodology adopted and the sources of information used by AECOM in providing its services are outlined in this Report. The work described in this Report was undertaken between August 2016 and March 2017 and is based on the conditions encountered and the information available during the said period of time. The scope of this Report and the services are accordingly factually limited by these circumstances. Where assessments of works or costs identified in this Report are made, such assessments are based upon the information available at the time and where appropriate are subject to further investigations or information which may become available. AECOM disclaim any undertaking or obligation to advise any person of any change in any matter affecting the Report, which may come or be brought to AECOM’s attention after the date of the Report. Certain statements made in the Report that are not historical facts may constitute estimates, projections or other forward-looking statements and even though they are based on reasonable assumptions as of the date of the Report, such forward-looking statements by their nature involve risks and uncertainties that could cause actual results to differ materially from the results predicted. AECOM specifically does not guarantee or warrant any estimate or projections contained in this Report. Copyright © 2017 AECOM Infrastructure & Environment UK Limited. All Rights Reserved. This document has been prepared by AECOM Infrastructure & Environment UK Limited (“AECOM”) for sole use of our client (the “Client”) in accordance with generally accepted consultancy principles, the budget for fees and the terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. March 2017 AECOM 3 Braintree District Council Water Cycle Study FINAL Table of Contents List of Acronyms ...................................................................................................................................................... 7 Non-Technical Summary ......................................................................................................................................... 8 Wastewater Strategy .................................................................................................................................... 8 Water Supply Strategy ................................................................................................................................. 9 Overall Impact of Development .................................................................................................................. 10 1. Introduction ................................................................................................................................................ 11 1.1 Background .................................................................................................................................... 11 1.2 WCS History ................................................................................................................................... 11 1.3 Study Governance .......................................................................................................................... 12 1.4 WCS Scope .................................................................................................................................... 12 1.5 Key Assumptions and Conditions ................................................................................................... 12 1.6 Report Structure ............................................................................................................................. 14 2. Study Drivers ............................................................................................................................................. 15 2.1 OFWAT Price Review ..................................................................................................................... 15 2.2 Water Framework Directive ............................................................................................................ 16 3. Proposed Growth ....................................................................................................................................... 17 3.1 Preferred Growth Strategy .............................................................................................................. 17 3.2 Housing .......................................................................................................................................... 19 3.3 Employment .................................................................................................................................... 19 4. Wastewater Treatment ............................................................................................................................... 20 4.1 Wastewater in the District ............................................................................................................... 20 4.2 Management of WRC Discharges .................................................................................................. 22 4.3 WFD Compliance ........................................................................................................................... 22 4.4 Habitats Directive ........................................................................................................................... 23 4.5 Wastewater Assessment Overview ................................................................................................. 24 4.6 WRC Headroom Assessment ......................................................................................................... 26 4.7 Water Quality Assessment .............................................................................................................. 32 4.8 Ecological Appraisal........................................................................................................................ 47 4.9 Wastewater Summary .................................................................................................................... 55 5. Water Supply Strategy ............................................................................................................................... 56 5.1 Introduction ..................................................................................................................................... 56 5.2 Abstraction Licensing Strategies .................................................................................................... 56 5.3 Water Resource Planning ............................................................................................................... 57 5.4 Water Resource Planning in the District ......................................................................................... 57 5.5 Demand for Water .......................................................................................................................... 57 5.6 Planned Water Availability Summary .............................................................................................. 58 5.7 Water Efficiency Plan ...................................................................................................................... 60 5.8 Drivers and Justification for Water Efficiency .................................................................................. 61 5.9 Water Neutrality .............................................................................................................................. 62 6. Major Development Site Assessment .......................................................................................................
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