Joint Warwickshire Partnership Water Cycle Study
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Water Submitted to Submitted by North Warwickshire Borough AECOM Council Midpoint Alençon Link Basingstoke Hampshire RG21 7PP United Kingdom Joint Warwickshire Partnership Water Cycle Study Final Report October 2016 AECOM Joint Warwickshire Partnership WCS Page i Prepared by: Craig Boorman Checked by: Gemma Hoad Senior Assistant Hydrologist Senior Water Consultant Hannah Booth Graduate Consultant Approved by: Sarah Kelly Regional Director Rev No Comments Checked Approved Date by by 1 Draft Report GH CP 23/09/16 2 Final Report GH SK 27/10/16 Midpoint, Alençon Link, Basingstoke, Hampshire, RG21 7PP, United Kingdom Telephone: 01256 310 200 Website: http://www.aecom.com Joint Warwickshire Partnership WCS – Final Report October 2016 AECOM Joint Warwickshire Partnership WCS Page ii Limitations AECOM Infrastructure & Environment UK Limited (“AECOM”) has prepared this Report for the sole use North Warwickshire Borough Council (“Client”) on behalf of Nuneaton and Bedworth Borough Council, Rugby Borough Council and Warwick District Council in accordance with the Agreement under which our services were performed (“Warwickshire Sub-regional_WCS_Tender_FINAL”, June 2016). 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 June and October 2016 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 © This Report is the copyright of AECOM Infrastructure & Environment UK Limited. Any unauthorised reproduction or usage by any person other than the addressee is strictly prohibited. Joint Warwickshire Partnership WCS – Final Report October 2016 AECOM Joint Warwickshire Partnership WCS Page iii Contents Executive Summary ............................................................................................................................................................. 7 The Wastewater Strategy .............................................................................................................................................. 7 Wastewater Treatment ................................................................................................................................................... 7 Water Supply Strategy ................................................................................................................................................... 9 Water Cycle Study Recommendations and Policy ..................................................................................................... 9 1 Introduction ................................................................................................................................................................ 12 1.1 Background ......................................................................................................................................................... 12 1.2 WCS History ........................................................................................................................................................ 12 1.3 Study Governance ............................................................................................................................................... 12 1.4 WCS Scope ......................................................................................................................................................... 13 1.5 Study Drivers ....................................................................................................................................................... 13 1.6 Key Assumptions ................................................................................................................................................. 14 1.6.1 Water Use and Household Occupancy Rate .............................................................................................. 14 1.6.2 Wastewater Treatment ................................................................................................................................ 14 1.7 Report Structure .................................................................................................................................................. 14 2 Proposed Growth ....................................................................................................................................................... 15 2.1 Preferred Growth Strategy ................................................................................................................................... 15 2.2 Housing ............................................................................................................................................................... 15 2.2.1 Completions and Outstanding Developments ............................................................................................. 16 2.2.2 North Warwickshire ..................................................................................................................................... 16 2.2.3 Nuneaton & Bedworth ................................................................................................................................. 17 2.2.4 Rugby ......................................................................................................................................................... 17 2.2.5 Warwick ...................................................................................................................................................... 17 2.3 Employment ........................................................................................................................................................ 18 3 Wastewater Treatment Assessment......................................................................................................................... 19 3.1 Wastewater Treatment Assessment Approach ................................................................................................... 19 3.1.1 Wastewater Treatment in the study area .................................................................................................... 19 3.1.2 Management of WwTW Discharges ............................................................................................................ 19 3.1.3 WFD Compliance ........................................................................................................................................ 20 3.1.4 Habitats Directive ........................................................................................................................................ 20 3.1.5 Assessment Methodology Summary ........................................................................................................... 20 3.1.6 Assessment Results Overview.................................................................................................................... 21 3.2 WwTW Headroom Assessment ........................................................................................................................... 22 3.2.1 WwTW with Permitted Headroom (Phase 1)............................................................................................... 22 3.2.2 WwTW without Permitted Headroom (Phase 2).......................................................................................... 23 3.3 Water Quality Modelling (Phase 2) ...................................................................................................................... 24 3.3.1 Atherstone WwTW ...................................................................................................................................... 24 3.3.2 Churchover WwTW ..................................................................................................................................... 26 3.3.3 Dunchurch WwTW .....................................................................................................................................