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South Essex Outline Water Cycle Study Technical Report

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South Essex Outline Water Cycle Study Technical Report South Essex Outline Water Cycle Study Technical Report Final September 2011 Prepared for South Essex: Outline Water Cycle Study Revision Schedule South Essex Water Cycle Study September 2011 Rev Date Details Prepared by Reviewed by Approved by 01 April 2011 D132233: S. Clare Postlethwaite Carl Pelling Carl Pelling Essex Outline Senior Consultant Principal Consultant Principal Consultant WCS – First Draft_v1 02 August 2011 Final Draft Clare Postlethwaite Rob Sweet Carl Pelling Senior Consultant Senior Consultant Principal Consultant 03 September Final Clare Postlethwaite Rob Sweet Jon Robinson 2011 Senior Consultant Senior Consultant Technical Director URS/Scott Wilson Scott House Alençon Link Basingstoke RG21 7PP Tel 01256 310200 Fax 01256 310201 www.urs-scottwilson.com South Essex Water Cycle Study Limitations URS Scott Wilson Ltd (“URS Scott Wilson”) has prepared this Report for the sole use of Basildon Borough Council, Castle Point Borough Council and Rochford District Council (“Client”) in accordance with the Agreement under which our services were performed. No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by URS Scott Wilson. This Report is confidential and may not be disclosed by the Client or relied upon by any other party without the prior and express written agreement of URS Scott Wilson. 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 URS Scott Wilson has not been independently verified by URS Scott Wilson, unless otherwise stated in the Report. The methodology adopted and the sources of information used by URS Scott Wilson in providing its services are outlined in this Report. The work described in this Report was undertaken between June 2010 and September 2011 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. URS Scott Wilson 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 URS Scott Wilson’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. URS Scott Wilson specifically does not guarantee or warrant any estimate or projections contained in this Report. Copyright © This Report is the copyright of URS Scott Wilson Ltd. Any unauthorised reproduction or usage by any person other than the addressee is strictly prohibited. South Essex Water Cycle Study Table of Contents Acronyms and Abbreviations.................................................................... 1 Executive Summary................................................................................... 3 1 Introduction ..................................................................................... 5 1.1 Growth in South Essex ................................................................................................... 5 1.2 Study History .................................................................................................................. 5 1.3 TGSE Scoping Study 2009.............................................................................................6 1.4 Study Contributors.......................................................................................................... 7 1.5 Aims and Objectives....................................................................................................... 8 1.6 Study Area...................................................................................................................... 8 2 Policy and Supporting Information.............................................. 11 2.1 Legislation and Policy ................................................................................................... 11 2.2 Guidance ...................................................................................................................... 15 2.3 Supporting Documents ................................................................................................. 15 3 Proposed Growth .......................................................................... 17 3.1 Introduction................................................................................................................... 17 3.2 Basildon........................................................................................................................ 17 3.3 Castle Point .................................................................................................................. 19 3.4 Rochford....................................................................................................................... 20 4 South Essex Wastewater Strategy 2011-2031 ............................. 21 4.1 Introduction................................................................................................................... 21 4.2 Baseline........................................................................................................................ 21 4.3 Assessment Methodology............................................................................................. 22 4.4 Wastewater Treatment Capacity Assessment............................................................... 24 4.5 Environmental and Ecological Impact ........................................................................... 32 4.6 Wastewater Network Capacity Assessment.................................................................. 39 4.7 Conclusions.................................................................................................................. 52 5 South Essex Water Supply Strategy 2011-2031 .......................... 54 5.1 Water Resources in the Study Area.............................................................................. 54 5.2 The Abberton Reservoir Scheme.................................................................................. 57 5.3 Water Demand Calculations ......................................................................................... 57 5.4 Water Efficiency............................................................................................................ 58 5.5 Water Supply Infrastructure .......................................................................................... 78 5.6 Environmental and Ecological Impact ........................................................................... 78 5.7 Conclusions.................................................................................................................. 81 South Essex Water Cycle Study 5.8 Measures to achieve CfSH Levels 3/4 .......................................................................... 82 6 South Essex Flood Risk Management......................................... 91 6.1 Flood Risk to Development........................................................................................... 91 6.2 Flood Risk from Development – Surface Water Management....................................... 98 6.3 Flood Risk from Development - Increased WwTW Discharges ................................... 102 6.4 Climate Change.......................................................................................................... 102 6.5 Conclusions................................................................................................................ 102 7 South Essex Growth Areas Assessment................................... 104 7.1 Introduction................................................................................................................. 104 7.2 Basildon Borough ....................................................................................................... 105 7.3 Castle Point Borough.................................................................................................. 127 7.4 Rochford District ......................................................................................................... 130 8 Infrastructure Funding Options.................................................. 135 8.1 Suggested Developer Contribution Options ................................................................ 135 8.2 Proposed Funding Process......................................................................................... 137 8.3 Further Cost Considerations ....................................................................................... 138 9 Outline Policy Guidance ............................................................. 139 9.1 Introduction................................................................................................................. 139 9.2 Policy
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