Greater Norwich Water Cycle Study Greater Norwich Authorities Draft for consultation Project number: 60593120 February 2020 Greater Norwich Water Cycle Study Draft for consultation Greater Norwich Authorities AECOM Quality information Prepared by Checked by Verified by Approved by Hannah Booth Amy Ruocco Carl Pelling Amy Ruocco Graduate Water Senior Water Consultant Regional Director Senior Water Consultant Consultant Laura Soothill Graduate Engineer Christina Bakopoulou Flood Risk Engineer Revision History Revision Revision date Details Authorized Name Position 01 27/11/2019 Draft for comment CP Carl Pelling Regional Director 02 28/01/2020 Draft for CP Carl Pelling Regional Director consultation 03 05/02/2020 Draft for CP Carl Pelling Regional Director consultation Position statement February 2020 This report represents a working draft of the GNLP Outline Water Cycle Study. Consultation is ongoing with Anglian Water Services, the Environment Agency and Natural England who have not yet signed off the study conclusions and it is therefore subject to change. Further updates are also required to align with some recent changes to housing numbers and extension of the plan period to 2038 agreed in December 2019. These will be incorporated into the final report. Prepared for: Broadland District Council, Norwich City Council and South Norfolk District Council Prepared by: AECOM Infrastructure & Environment UK Limited Midpoint, Alencon Link Basingstoke Hampshire RG21 7PP United Kingdom T: +44(0)1256 310200 aecom.com © 2020 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. February 2020 i Project Reference: 60593120 Greater Norwich Water Cycle Study Draft for consultation Greater Norwich Authorities AECOM Table of Contents List of Acronyms ......................................................................................................... v Executive summary .................................................................................................... vi Wastewater Strategy ............................................................................................................................................... vi Water Supply Strategy ............................................................................................................................................ vi 1 Introduction ...................................................................................................... 1 1.1 Background ............................................................................................................................................... 1 1.2 Study Governance .................................................................................................................................... 1 1.3 WCS Scope .............................................................................................................................................. 2 1.4 Key Assumptions and Conditions ............................................................................................................. 2 1.5 Report Structure ....................................................................................................................................... 3 2 Study Drivers ................................................................................................... 4 2.1 OFWAT Price Review ............................................................................................................................... 4 2.2 Water Framework Directive....................................................................................................................... 5 2.3 Habitats Directive ...................................................................................................................................... 5 3 Proposed Growth ............................................................................................. 6 3.1 Preferred Growth Strategy ........................................................................................................................ 6 4 Wastewater Treatment Strategy ...................................................................... 7 4.1 Wastewater in the Greater Norwich Area .................................................................................................. 7 4.2 Management of WRC Discharges ............................................................................................................ 8 4.3 WFD Compliance ...................................................................................................................................... 9 4.4 Habitats Directive .................................................................................................................................... 10 4.5 Wastewater Assessment Overview ......................................................................................................... 11 4.6 WRC Headroom Assessment ................................................................................................................. 13 4.7 RQP Water Quality Assessment ............................................................................................................. 19 4.8 Load Standstill Results ........................................................................................................................... 30 4.9 Ecological Appraisal ................................................................................................................................ 34 4.10 Wastewater Treatment Overview ............................................................................................................ 39 5 Water Supply Strategy ................................................................................... 46 5.1 Introduction ............................................................................................................................................. 46 5.2 Abstraction Licensing Strategies ............................................................................................................. 46 5.3 Water Resource Planning ....................................................................................................................... 47 5.4 Water Resource Planning in the Greater Norwich Area .......................................................................... 47 5.5 Water Efficiency Plan .............................................................................................................................. 52 5.6 Water Neutrality ...................................................................................................................................... 53 6 Major Development Site Assessment ............................................................ 58 6.1 Introduction ............................................................................................................................................. 58 6.2 Assessment Methodologies .................................................................................................................... 58 6.3 Site assessment table summary ............................................................................................................. 59 7 Water Cycle Strategy Summary and Recommendations ............................... 65 7.1 Wastewater and Water Quality ............................................................................................................... 65 7.2 Water Resources .................................................................................................................................... 65 7.3 Recommendations and Policy ................................................................................................................ 67 7.4 Policy Recommendations Overview ....................................................................................................... 67 7.5 Further Recommendations ..................................................................................................................... 68 Appendix A Policy and Legislative Drivers Shaping the WCS .................................. 70 Appendix B Relevant Planning Documents to the WCS........................................... 72 Appendix C WRC Capacity Assessment results ...................................................... 73 C.1 Modelling assumptions and input data .................................................................................................... 73 C.2 Assessment Techniques ......................................................................................................................... 73 February 2020 ii Project Reference: 60593120 Greater Norwich Water Cycle Study Draft for consultation Greater Norwich Authorities AECOM C.3 Headroom Assessment ........................................................................................................................... 74 C.4 Water Quality Assessment .....................................................................................................................