Technical documents

These documents give more detail on the solutions we are exploring. They include our technical investigations, feasibility studies and submissions to our regulators.

Overview of RAPID and the gateway process

The major infrastructure projects we’re exploring – desalination, water recycling and new bulk supplies – are being overseen by the new Regulators’ Alliance for Progressing Infrastructure Development (RAPID). RAPID is an advisory board that makes recommendations to Ofwat.

It comprises Ofwat, the Environment Agency and the Drinking Water Inspectorate – and is being advised by Natural England.

The group is overseeing more than a dozen strategic water resources projects for several water companies to identify optimal regional and inter-regional solutions that could be started in 2025-2030.

For more information on RAPID, see ofwat.gov.uk/regulated-companies/rapid.

Gate 2

Our Gate 2 submissions to RAPID

You can view copies of our submissions to RAPID below. Please note, some company-sensitive information has been redacted.

 

RAPID Gate 2 Submission: Response to draft decision

Southern Water – Letter to the Environment Agency and RAPID

RAPID Submission: Southern Water Accelerated Gate 2 Submission Summary

RAPID Submission: Water Recycling – Gate 2 Detailed Feasibility & Concept Design Report ii

RAPID Submission: Havant Thicket – Gate 2 Detailed Feasibility & Concept Design Report iii

Annex 2: Water Recycling – Gate 2 Supporting Technical Report

Annex 3: Havant Thicket – Gate 2 Supporting Technical Report

Annex 4: Water Resources – Gate 2 Supporting Technical Report

Annex 5: Options Appraisal Process – Gate 2 Supporting Technical Report

Annex 6: Efficiency of Expenditure – Gate 2 Supporting Technical Report

Annex 7: Assurance Process – Gate 2 Supporting Technical Report

Annex 8: Legal and Regulatory Annex – Gate 2 Supporting Technical Report

Annex 9: Stakeholder and Customer Methodology – Gate 2 Supporting Technical Report

Annex 10: Proposed Gate 3 Outcomes and Activities – Gate 2 Supporting Technical Report

Annex 12: Outline Option Evolution Plan – Gate 2 Supporting Technical Report

Annex 13: Detailed Option Evolution Statement – Gate 2 Supporting Technical Report


Gate 2 – Query responses

Below you can see our responses to RAPID’s queries about our Gate 2 submission. Again, some company-sensitive information has been redacted.

HAV001 CAPEX Updated – B2-B4-B5-D2-Ceramic

HAV001 RAPID Gate 2 Response

HAV002 RAPID Gate 2 Response

HAV002 SDE001 SWR001 Response (Tables 11 12 and 13)

HAV003 RAPID Gate 2 Response

HAV005 RAPID Gate 2 Response

HAV006 Jacobs – New Gate 2 Final Assurance Statement

HAV006 RAPID Gate 2 Response

HAV007 RAPID Gate 2 Response

HAV008 RAPID Gate 2 Response

SDE001 RAPID Gate 2 Response

SDE003 RAPID Gate 2 Response

SRN001 RAPID Gate 2 Response

SRN001 WfLH Carbon Memo

SRN001 WfLH Memorandum – WfLH Water Recycling Plant Wastewater Discharges

SRN001 WfLH Tech Rp 1 – Watercourses

SRN001 WfLH Tech Rp 2 – Appendix A1 All Figures

SRN001 WfLH Tech Rp 2 – BNG Report

SRN001 WfLH Tech Rp 2 BNG – Appendix A2 Summary BNG Assessment

SRN001 WfLH Tech Rp 2 BNG – Appendix A3 Configuration Summary BNG Assessment

SRN001 WfLH Tech Rp 4 – HRA WRP Marine Consenting

SRN001 WfLH Tech Rp 5 – AQ Site Selection

SRN001 WfLH Tech Rp 6 – Ornithology and Noise

SRN002 RAPID Gate 2 Response

SRN003 RAPID Gate 2 Response (Final Complete Response)

SWR001 RAPID Gate 2 Response

SWR002, SDE002, HAV004 RAPID Gate 2 Consolidated Response 

SWR002, SDE002, HAV004 Updated Tables 11,12 and 13

SWR003 (HAV001) CAPEX Updated – B2-B4-B5-D2-Ceramic

SWR003 RAPID Gate 2 Response

SWR004 RAPID Gate 2 Response

SWR005 RAPID Gate 2 Response

SWR006 RAPID Gate 2 Response

SWR007 RAPID Gate 2 Response

SWR008 RAPID Gate 2 Response

SRN001 BNG A2iii Budds Farm to WRP Route 1

SRN001 BNG A2iv Construction Compound Example

SRN001 BNG A2ix Fawley to Testwood Route 3

SRN001 BNG A2v Desal Ashlett Creek Habitat

SRN001 BNG A2vi Desal Meon DS5 Habitat

SRN001 BNG A2vii Fawley to Testwood Route 1

SRN001 BNG A2viii Fawley to Testwood Route 2

SRN001 BNG A2x Fawley to Testwood Route 4

SRN001 BNG A2xi Fawley to Testwood Route SIA

SRN001 BNG A2xiii Fawley to Abstraction and Discharge Route 2

SRN001 BNG A2xiv Fawley to Abstraction and Discharge Route 3

SRN001 BNG A2xix Havant Thicket to Otterbourne Route 4

SRN001 BNG A2xv Fawley to Abstraction and Discharge Route 4

SRN001 BNG A4ix SWS G2 Natural Capital Workbook – BPT and WBS

SRN001 BNG A4v SWS G2 Natural Capital Workbook – Desal

SRN001 BNG A4vi SWS G2 Natural Capital Workbook – WRP

SRN001 BNG A4vii NCA A1 A2 Pipeline 1

SRN001 BNG A4vii NCA A1 A2 Pipeline 2

SRN001 BNG A4x NCA B2 Route 1

SRN001 BNG A4xi NCA B2 Route 2

SRN001 BNG A4xii NCA B4 Recycled Water from Budds Farm WTW Route 1

SRN001 BNG A4xiv NCA B4 Recycled Water from Budds Farm WTW Route 2

SRN001 BNG A4xix NCA B4 Water from Budds Farm WTW Route 3

SRN001 BNG A4xl NCA B5 Route 1

SRN001 BNG A4xli NCA B5 Route 2

SRN001 BNG A4xlii NCA D2 61Mld Alternative Bulk Supply Route 4

SRN001 BNG A4xliv NCA D2 61Mld Alternative Supply Route 3


Our Interim Update submission to RAPID

You can view copies of our submissions to RAPID below. Please note, some company-sensitive information has been redacted.

Interim Update – Solution Summary

Interim Update – Regulator and Other Statutory Bodies Engagement Plan

Interim Update – Customer and Stakeholder Engagement

Interim Update – Efficiency of Expenditure

Interim Update – Activity Plan to Gate 2

Interim Update – Options Appraisal Process

Interim Update – Conceptual and Detailed Feasibility – Desalination

Interim Update – Conceptual Design Report – Annex 1 Desalination 


Gate 1

RAPID's Gate 1 recommendations

RAPID has published its recommendations on our Gate 1 submission.

View the documents


Our Gate 1 submissions to RAPID

You can view copies of our submissions to RAPID below. Please note, some company-sensitive information has been redacted.

Southern Water Accelerated Gate 1 Submission Summary

Desalination Accelerated Gate 1 Preliminary Feasibility Assessment

Water Recycling Accelerated Gate 1 Preliminary Feasibility Assessment

West Country Sources North Accelerated Gate 1 Preliminary Feasibility Assessment

Additional Solution Accelerated Gate 1 Preliminary Feasibility Assessment

Southern Water Accelerated Gate 1 Navigation and Glossary

Southern Water Accelerated Gate 1 Priority Actions Submission


Section 20 Operating Agreement

View the legal agreement we signed with the Environment Agency (EA) in 2018:

Section 20 Operating Agreement

 
 
 
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