West Suffolk Council Water Cycle Study
Total Page:16
File Type:pdf, Size:1020Kb
WEST SUFFOLK COUNCIL WATER CYCLE STUDY Stage 1 – Outline WCS 10039526-ARC-EWE-S1-RP-DH-00003 APRIL 2021 CONTACTS RENUKA GUNASEKARA Technical Director m +44 (0) 7793 187 700 Arcadis. e [email protected] 2 Cornwall Street, Birmingham B3 2DX Arcadis Consulting (UK) Limited is a private limited company registered in England & Wales (registered number 02212959). Registered Office at Arcadis House, 34 York Way, London, N1 9AB, UK. Part of the Arcadis Group of Companies along with other entities in the UK. Copyright © 2015 Arcadis. All rights reserved. arcadis.com VERSION CONTROL Version Date Author Changes Laura Peacock / D1 December 2020 Draft Issue for comment Sam Hignett Sam Hignett / Final Draft for Client Review 02 March 2021 Aimee Hart Sam Hignett / Final Report 03 April 2021 Aimee Hart This report dated 08 April 2021 has been prepared for West Suffolk Council (the “Client”) in accordance with the terms and conditions of appointment dated 17 March 2020(the “Appointment”) between the Client and Arcadis Consulting (UK) Limited (“Arcadis”) for the purposes specified in the Appointment. For avoidance of doubt, no other person(s) may use or rely upon this report or its contents, and Arcadis accepts no responsibility for any such use or reliance thereon by any other third party. CONTENTS EXECUTIVE SUMMARY ................................................................................................... 11 1 INTRODUCTION ..................................................................................................... 12 1.1.1 Previous Water Cycle Studies .......................................................................................................... 13 1.2 Study Area ........................................................................................................................................... 14 1.3 Key Stakeholders ................................................................................................................................ 16 1.4 The Water Cycle .................................................................................................................................. 17 2 WATER ENVIRONMENT POLICY AND EVIDENCE BASE ................................... 19 2.1 Policy Context ..................................................................................................................................... 19 2.1.1 National Policy .................................................................................................................................. 19 2.1.2 Local Policy ....................................................................................................................................... 20 2.2 Water Resource Management Plan ................................................................................................... 21 2.3 Water Recycling Long Term Plan (WRLTP) ..................................................................................... 22 2.4 River Basin Management Plan (RBMP) ............................................................................................ 23 2.5 Abstraction Licensing Strategies (ALS) ........................................................................................... 26 2.6 Water Resources East ........................................................................................................................ 26 2.7 Catchment Flood Management Plan (CFMP) ................................................................................... 27 2.8 Strategic Flood Risk Assessment (SFRA) ....................................................................................... 30 3 PROPOSED DEVELOPMENT ................................................................................ 32 3.1 Residential Development ................................................................................................................... 32 3.2 Employment Area Development ....................................................................................................... 35 4 WATER RESOURCES AND SUPPLY .................................................................... 36 4.1 Existing Situation ............................................................................................................................... 36 4.1.1 RBMP Groundwater Bodies.............................................................................................................. 38 4.2 WRMP Supply and Demand Analysis ............................................................................................... 38 4.3 ALS Requirements .............................................................................................................................. 40 4.3.1 Resource Availability ........................................................................................................................ 40 4.3.2 Abstraction Management .................................................................................................................. 41 4.4 Supply Infrastructure ......................................................................................................................... 41 4.4.1 Current .............................................................................................................................................. 41 4.4.2 Future ................................................................................................................................................ 42 4.5 WCS Potable Water Demand Projections ........................................................................................ 43 4.5.1 Methodology ..................................................................................................................................... 43 4.5.2 Demand scenarios ............................................................................................................................ 43 4.5.3 Potable Water Demand Projection Results ...................................................................................... 44 4.5.4 Limitations ......................................................................................................................................... 46 4.6 Water Efficiency .................................................................................................................................. 46 4.7 Issues for Next Stage ......................................................................................................................... 47 5 WASTEWATER TREATMENT AND SEWERAGE ................................................. 48 5.1 Existing Situation ............................................................................................................................... 48 5.2 Development Considerations and Impact ........................................................................................ 49 5.2.1 Methodology ..................................................................................................................................... 49 5.2.2 Wastewater Treatment Constraints .................................................................................................. 50 5.2.3 WRC Capacity Summary .................................................................................................................. 53 5.3 Environmental Capacity (Water Quality) .......................................................................................... 53 5.3.1 Water Quality Baseline ..................................................................................................................... 54 5.3.2 Treated Effluent Discharge Assessment .......................................................................................... 54 5.3.3 Natura 2000 Sites ............................................................................................................................. 56 5.4 Issues for Next Stage ......................................................................................................................... 58 6 FLOOD RISK AND SURFACE WATER .................................................................. 59 6.1 Baseline Situation ............................................................................................................................... 59 Mildenhall and Brandon ................................................................................................................................. 60 6.2 Development Considerations and Impacts ...................................................................................... 60 6.2.1 Implications for development ............................................................................................................ 62 6.3 Flood Risk From WRC Discharges ................................................................................................... 62 6.3.1 Methodology ..................................................................................................................................... 62 6.3.2 Results .............................................................................................................................................. 63 6.4 Suitability of SUDS ............................................................................................................................. 65 6.5 Issues for Next Stage ......................................................................................................................... 65 7 CONSTRAINTS, SOLUTIONS AND OPPORTUNITIES