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Water Resources Management Plan

This plan sets out how we’ll create a resilient water future for customers in the South East and keep taps flowing during droughts.

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Bewl Reservoir Kent East Sussex with low water levels

Plan overview

Our Water Resources Management Plan (WRMP), published every five years, forecasts how much water we’ll need in the future and proposes a mix of options to make sure we have enough. We’re currently revising our draft plan for the next 50 years.

Our first consultation on our draft Water Resources Management Plan closed on 20th February 2023. We issued our Statement of Response in the summer of 2023, and our regulator asked for some revisions to be made to the plan. 

We are consulting on our draft Water Resource Management Plan (WRMP 2024) from 11 September to 4 December 2024. Read our latest consultation summary below which has all the information on how we will continue to provide high-quality, reliable water supplies, protect the environment and sustain our growing economy for our 2.6 million customers.

Our draft WRMP 2024 consultation

It's really important we hear from our customers and stakeholders. We want to know what you think of our ambitious leakage targets, our water savings ideas, and our large and small options to increase supply. It will help us shape our final WRMP24.

Once the consultation ends, we will publish a Statement of Response to address all the issues raised during consultation and amend our plan if necessary. We will then submit our final WRMP24 to the Secretary of State for Defra for approval and publish it once approved.

We consulted on draft WRMP24 between November 2022 and February 2023. Since the draft WRMP24 consultation, dates for completing some key schemes have been revised. These are as follows:

  • The Havant Thicket Reservoir in Hampshire will now be completed in 2031 instead of 2029.
  • The Hampshire Water Transfer and Water Recycling Project (HWTWRP) will be completed in 2034 instead of 2030.
  • The Sandown water recycling project on the Isle of Wight will be completed in 2030 instead of 2027.
  • The Littlehampton water recycling project in Sussex will be completed in 2030 instead of 2027. 

In order to mitigate the impact of these delays and ensure that we are able to maintain sufficient supplies under drought conditions, we have made a number of changes in our revised draft WRMP24. These include:

  • Promoting greater savings in water used in homes and businesses.
  • Delivering two groundwater schemes in Hampshire and one groundwater scheme in Sussex by 2030.
  • Increasing the bulk import from SES Water into Sussex.
  • Importing water from Norway via sea tankers to provide additional resilience between 2031 and 2034 (when the
  • Hampshire Water Transfer Project is completed).

There are a number of ways for you to have your say.  

  1. Take part in our online survey at waterresources.southernwater.co.uk.
  2. Email Defra at water.resources@defra.gov.uk, putting Southern Water draft water resources management plan in the subject line. Please copy it to our mail box wrmp@southernwater.co.uk.
  3. Print out our survey or write a response and send it to Defra at: Water Resources Management Plan Consultation (Southern Water), Water Services, Department for Environment, Food and Rural Affairs, Seacole Ground Floor, 2 Marsham Street, London, SW1 4DF.

If you have any issues accessing our consultation or have any questions relating to it, please contact us:

Email: wrmp@southernwater.co.uk.
Write: Southern House, Yeoman Rd, Worthing BN13 3NX
Phone: 0330 303 0368

The WRMP consultation summary, technical documents, and appendices as well as the consultation survey questions can be found at waterresources.southernwater.co.uk. 

Please note: this link takes you to a third-party website. This will be protected by GDPR. Any responses made will be sent to Defra. 

Statement of Response and associated annexes

We consulted on our draft plans, which look out to 2075, between 14 November 2022 and 20 February 2023. We had over 500 responses and issued our Statement of Response (SoR) in August which addressed them. One of the main issues raised in the responses to our consultation was our proposed Hampshire Water Transfer and Water Recycling Project (HWTWRP). In combination with Portsmouth Water, we have produced an annex addressing the specific issues raised.

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Our existing WRMP 2019

Find out more about our last Water Resources Management Plan, published in December 2019, which details how we plan to keep your taps flowing for the next 50 years.

Draft WRMP24 technical documents

We’ve produced more detail on how we developed our draft WRMP and the options we considered.

Bulk import (HSE) PWC to Otterbourne WSW (21Mld)

Bulk import (HSE) Thames to Southern Transfer - potable (120Mld) (Combination b)

Bulk import (KTZ) SEW RZ8 to near Canterbury (2 Mld)

Bulk import (KTZ) SEW RZ8 to near Canterbury (20Mld)

Bulk import (SNZ) Havant Thicket Reservoir to Pulborough WSW (20Mld)

Bulk import (SNZ) Havant Thicket Reservoir to Pulborough WSW (50Mld)

Bulk import (SNZ) SES to SNZ (10Mld)

Bulk import (SNZ) SEW RZ5 to Pulborough (10Mld)

Desalination (KME) Isle of Sheppey (10Mld)

Desalination (KME) Isle of Sheppey (20Mld)

Desalination (KME) Isle of Sheppey phase 2 (10Mld)

Desalination (KMW) Thames Estuary (10Mld)

Desalination (KMW) Thames Estuary (20Mld) (Development only)

Desalination (KMW) Thames Estuary (20Mld)

Desalination (KMW) Thames Estuary phase 2 (10Mld)

Desalination (KMW) Thames Estuary phase 2 (20Mld)

Desalination (KTZ) East Thanet (10Mld)

Desalination (KTZ) East Thanet (20Mld) Phase 2

Desalination (KTZ) East Thanet (20Mld)

Desalination (SBZ) Sussex Coast (10Mld) Phase 2

Desalination (SBZ) Sussex Coast (10Mld)

Desalination (SWZ) Tidal River Arun (10 Mld)

Drought option - supply (HSE) Candover (15.4Mld)

Drought option - supply (HSE) Lower Itchen sources from 2027 (38Mld)

Drought option - supply (HSE) Lower Itchen sources to 2027 (38Mld)

Drought option - supply (HSW) River Test (80Mld)

Drought option - supply (IOW) Caul Bourne (1.5Mld)

Drought option - supply (IOW) Eastern Yar (1Mld)

Drought option - supply (IOW) Lukely Brook (3Mld)

Drought option - supply (KMW) River Medway Scheme 1-4 (17Mld)

Drought option - supply (SHZ) Darwell reservoir 1-3 (1.2Mld)

Drought option - supply (SNZ) Pulborough surface water (Phases 1 to 3) (23Mld)

Drought option - supply (SNZ) Weir Wood (3.1Mld)

Drought option - supply (SWZ) East Worthing (2.5Mld)

Drought option - supply (SWZ) North Arundel (1.2Mld) version 2

Drought option - supply (SWZ) North Arundel (1.2Mld)

Education campaign (All resource zones)

Groundwater (HKZ) Newbury (1.3Mld)

Groundwater (HRZ) Romsey (4.8Mld)

Groundwater (IOW) Eastern Yar3 (1.5Mld)

Groundwater (IOW) Newchurch (LGS) (1.9Mld)

Groundwater (KME) Gravesend (2.7Mld)

Groundwater (SHZ) Rye Wells (1.5Mld)

Groundwater (SNZ) Petworth (4Mld) (Planning only)

Groundwater (SNZ) Petworth (4Mld)

Groundwater (SWZ) Pulborough Winter Transfer Stage 1 (2Mld)

Implementation of changes to regulation and policy on building standards and appliances (All resource zones)

Interzonal transfer (HAZ-HKZ) Hampshire Grid - reversible (10 Mld)

Interzonal transfer (HRZ-HSW) Romsey Town and Broadlands - bidirectional (3.1Mld)

Interzonal transfer (HRZ-HSW) Romsey Town and Broadlands - bidirectional (5Mld)

Interzonal transfer (HSE-HRZ) Abbotswood (1.1Mld)

Interzonal transfer (HSE-HWZ) Hampshire Grid - (38 Mld) bidirectional

Interzonal transfer (HSW-HRZ) Romsey Town and Broadlands - bidirectional (3.1Mld)

Interzonal transfer (HSW-HRZ) Romsey Town and Broadlands - bidirectional (5Mld)

Interzonal transfer (HWZ-HAZ) Hampshire Grid - (30 Mld) bidirectional

Interzonal transfer (KTZ-KME) Existing transfer (14Mld)

Interzonal transfer (KTZ-KMW) Utilise full existing transfer capacity (9Mld)

Interzonal transfer (SBZ-SWZ) Brighton to Worthing - bidirectional (40Mld)

Interzonal transfer (SNZ-SWZ) Pulborough WSW to Worthing (30Mld)

Interzonal transfer (SNZ-SWZ) Pulborough WSW to Worthing (60Mld)

Interzonal transfer (SWZ-SBZ) V6 valve additional capacity (13Mld)

Interzonal transfer Pulborough winter transfer stage 2 (4Mld)

Managed Aquifer Recharge (MAR) scheme (5.5 Mld)

Managed Aquifer Recharge (MAR) Scheme (5.5Mld) (Development only)

Marketing and comms campaign (All resource zones)

Programme of leakage reduction

Recycling (HSE) Hampshire Water Transfer and Water Recycling Project (60Mld)

Recycling (HSE) Woolston WTW (7.1 Mld)

Recycling (IOW) Sandown WTW (8.1Mld)

Recycling (KME) Sittingbourne Industrial Water recycling (7.5Mld)

Recycling (KMW) Medway WTW (12.8Mld)

Recycling (SHZ) Hastings WTW (15Mld)

Recycling (SHZ) Tunbridge Wells WTW (3.6Mld)

Recycling (SNZ) Horsham WTW (6.8Mld)

Recycling (SNZ) Littlehampton WTW (15Mld)

Roll out of smart metering (All resource zones)

Roll out of smart tariffs across the company (All resource zones)

Storage (SHZ) Raising Bewl 0.4m (3Mld)

Storage (SNZ) River Adur Offline Reservoir (19.5Mld) (Planning only)

Storage (SNZ) River Adur Offline Reservoir (19.5Mld)

Supply of water efficiency products and services (All resource zones)

Treatment capacity (HSE) Upgrade Otterbourne WSW (30 Mld)

Treatment capacity (HSW) Upgrade River Test WSW (60Mld)

Water Audit programme (All resource zones)

In response to a request raised from a consultee during the draft Water Resource Management Plan 2024 (dWRMP) consultation, we have produced a short Addendum that collates and sets out data which is relevant to the Western Area and Water for Life – Hampshire Programme.

The collation of the data in this Addendum is intended to help readers better understand the information that has been provided in our draft plan, particularly in relation to abstraction during drought periods, on the Rivers Itchen and Test.

SWS Western Area SDB

DWRMP24 Western Area Supply Demand Balance

We worked with Water Resources South East (WRSE) – an alliance of the six water companies serving the South East – to develop a region-wide plan for water resources. The draft regional plan is reflected in our draft WRMP.