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Uttlesford District Water Cycle Study Stage 1: Scoping and Outline Strategy

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Uttlesford District Water Cycle Study Stage 1: Scoping and Outline Strategy Uttlesford District Council Uttlesford District Water Cycle Study Stage 1: Scoping and Outline Strategy Outline Strategy Report Hyder Consulting (UK) Limited 2212959 Aston Cross Business Village 50 Rocky Lane Aston Birmingham B6 5RQ United Kingdom Tel: +44 (0)121 333 4466 Fax: +44 (0)121 333 4275 www.hyderconsulting.com Uttlesford District Council Uttlesford District Water Cycle Study Stage 1: Scoping and Outline Strategy Outline Strategy Report Author Daniel Vogtlin Checker Renuka Gunasekara Approver Bob Sargent Report No 6003-BM01456-BMR-13-Uttlesford WCS Outline Strategy.Doc Date 29 January 2010 This report has been prepared for Uttlesford District Council in accordance with the terms and conditions of appointment for Stage 1: Scoping and Outline Strategy dated December 2008. Hyder Consulting (UK) Limited (2212959) cannot accept any responsibility for any use of or reliance on the contents of this report by any third party. Revisions Prepared Approved Revision Date Description By By 1 07/05/2009 Draft DV RG 2 11/05/2009 Draft for Consultation DV RG 3 21/05/2009 Internal revision DV RG 4 11/06/2009 Internal revision DV RG 5 15/06/2009 TWU and UDC changes tracked DV RG 6 15/06/2009 Draft addressing TWU concerns and UDC comments DV RG 7 22/06/2009 Draft addressing initial AWS concerns (tracked) DV RG 8 29/06/2009 Draft addressing initial EA comments and further AWS (tracked) DV RG 9 10/09/2009 Final draft NP RG 10 16/09/2009 Final report after all comments addressed and checked DV RG 11 12/2009 Report to collect conclusions from additional consultation DV RG 12 19/01/2010 Final draft for stakeholder consideration DV RG 13 29/01/2010 Final Report DV RG Disclaimer The conclusions in this report, along with the information discussed at WCS steering group meetings, can be used by UDC to provide steer when progressing with their Core Strategy. However, UDC should note that as their Core Strategy is not yet finalised at the time of writing this WCS, it is impossible for this document to be classed as supporting evidence for a future Core Strategy at the Examination in Public stage. In order for the UDC Core Strategy to be found robust, additional WCS work, based on the final development locations and trajectory decided upon, will be required to support the Core Strategy Submission. In addition, the final versions of the most recent water company Water Resource Management Plans (WRMP) are anticipated in early 2010, which may alter the conclusions and recommendations of this report. It is suggested that any significant changes are analysed as part of any future WCS work undertaken. In order for UDC to make an informed decision following their forthcoming Core Strategy Preferred Option consultation, they will require additional detail regarding wastewater treatment solutions from the developers promoting the potential new settlements. It is highly likely that the EA and water companies will object to a UDC Core Strategy that includes a new settlement without this detailed information being made available to all stakeholders. CONTENTS 1 Executive Summary.............................................................................. 1 1.1 Introduction ........................................................................................... 1 1.2 Water Resources and Supply Infrastructure ......................................... 2 1.3 Flood Risk ............................................................................................ 2 1.4 Wastewater Capacity ............................................................................ 3 1.5 Environmental Capacity ........................................................................ 4 1.6 Conclusions and Recommendations .................................................... 4 2 Introduction ........................................................................................... 7 2.1 Study area .......................................................................................... 10 2.2 The Water Cycle ................................................................................. 13 2.3 Current funding ................................................................................... 14 3 Policy context ..................................................................................... 16 3.1 National policy .................................................................................... 16 3.2 Regional policy ................................................................................... 18 3.3 Local policy ......................................................................................... 19 4 Methodology ....................................................................................... 20 4.1 Assessment of existing situation......................................................... 20 4.2 Assessment of impact from development ........................................... 20 4.3 Limitations .......................................................................................... 23 5 Development Options ......................................................................... 24 5.1 Residential development .................................................................... 24 5.2 Employment area development .......................................................... 29 6 Water resources and supply ............................................................... 31 6.1 Hydrology ........................................................................................... 31 6.2 Hydrogeology ..................................................................................... 33 6.3 Summary of current resources ........................................................... 35 6.4 Current infrastructure .......................................................................... 36 6.5 Future infrastructure ........................................................................... 38 6.6 Development impacts ......................................................................... 40 6.7 Water neutrality .................................................................................. 41 6.8 Constraints and costs ......................................................................... 45 6.9 Issues for next stage .......................................................................... 46 7 Flood risk management ...................................................................... 47 Uttlesford District Water Cycle Study—Stage 1: Scoping and Outline Strategy Hyder Consulting (UK) Limited-2212959 Page i k:\bm01456 - uttlesford dc wcs\f-reports\6003-bm01456-bmr-13-uttlesford wcs outline strategy.doc 7.1 Existing situation ................................................................................. 47 7.2 Strategic objectives ............................................................................ 49 7.3 Constraints, solutions and costs ......................................................... 52 7.4 Issues for next stages ......................................................................... 58 8 Wastewater treatment and sewerage network ................................... 59 8.1 Existing situation ................................................................................. 59 8.2 Environmental capacity ...................................................................... 60 8.3 Development Impact ........................................................................... 69 8.4 Alternative options .............................................................................. 91 8.5 Issues for next stages ......................................................................... 92 9 Constraints, Solutions and Opportunities summary ........................... 94 10 Outline strategy Conclusions and Recommendations ..................... 104 10.1 Major infrastructure requirements ..................................................... 104 10.2 Implementation - constraints and solutions ...................................... 106 10.3 Proposed Strategy ............................................................................ 108 10.4 The need for a Detailed WCS ........................................................... 109 10.5 Guidance for UDC and developers ................................................... 110 Appendices Glossary Technical Glossary Appendix A: Planning Policy Context Appendix B: Occupancy Rate Projections Appendix C: Development Trajectory Appendix D: Catchment Abstraction Management Strategies Appendix E: Catchment Flood Management Plans Appendix F: Demand Impact Calculations Appendix G: Water Framework Directive Appendix H: Wastewater Treatment Options Appendix I: EA Indicative Consent Modelling Results Uttlesford District Water Cycle Study—Stage 1: Scoping and Outline Strategy Page ii Hyder Consulting Pty Ltd-ABN 76 104 485 289 k:\bm01456 - uttlesford dc wcs\f-reports\6003-bm01456-bmr-13-uttlesford wcs outline strategy.doc 1 Executive Summary 1.1 Introduction The housing target set for Uttlesford District by the Regional Spatial Strategy is 8,000 homes between 2001 and 2021 with a further 2,150 homes to make sure that there is an adequate supply of housing for 15 years from the adoption of the Core Strategy. In order to achieve this target the Local Development Framework will need to allocate new sites for 3,979 homes, in addition to the 2,572 completed since 2001, the 3,302 currently allocated and the 297 predicted on smaller sites. A Water Cycle Study (WCS) is required to ensure that the water supply, wastewater
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