Application for Adoption of Sewers

Under S104, Water Industry Act 1991

325050 A-DEVSRV-S104

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Public Sewers – Adoption of a Public Sewer (Sec 104 Water Industry Act 1991)
Southern Water is responsible for the wastewater services of over 4.1 million customers. Any new sewer to be adopted on residential/non-residential developments must comply with the requirements of the current issue of ‘Sewers for Adoption - a design and construction guide for developers’, in order to be subject to an ‘adoption agreement’.

Sewers for Adoption is a nationally recognised document and has been prepared in consultation with Water UK and the House Builders Federation. The guide, together with all sewerage undertakers’ addenda, is available from www.wrcplc.co.uk/sfa

Applying for the adoption of a new sewer
When you apply to have a sewer or lateral drain adopted under Section 104 you must complete the attached application form and send it to the address shown, together with all the relevant information, plans and an initial deposit as requested on the application form.

A separate S106 Sewer Connection application form for each connection to the public sewerage system, together with the appropriate fee, should also be submitted.

Consent to Discharge
Where ‘a consent to discharge’ is required from the Environment Agency, you must not agree to any conditions without first obtaining approval from Southern Water. Similarly, any restrictions on the discharge from surface water sewers that are to be offered for adoption should not be agreed without first obtaining the approval of Southern Water.

In the event of surface water discharging to a river or other watercourse through an outfall, the riparian owner will be required to grant legal easements to Southern Water. If the developer is the riparian owner and is already entering into a Deed of Grant of Easement with Southern Water in respect of sewers being laid in land which is to remain private, the rights to discharge may be included in the Deed of Grant. If not, a Deed of Grant is to be entered into by the riparian owner in order to grant rights to discharge to the river or other watercouse via the outfall. It shall be the developer’s responsibility to secure such rights prior to adoption.

If the river or other watercourse is in the control of a body such as a Port Authority, although the developer may have obtained the consent of the Port Authority to construct the works, Southern Water will also need legal easements as it does not have statutory powers to discharge through the outfall.

The developer will be responsible for the legal costs and disbursements of Southern Water in connection with the grant of legal easements.

Surface Water Disposal
Southern Water (and its predecessors), along with all other Sewerage Undertakers, have endorsed the guidelines laid down in Sewers for Adoption since its introduction in 1980. The current issue of Sewers for Adoption, as with previous editions, identifies hydraulic design requirements for both foul and surface water systems. With regard to surface water systems, Sewers for Adoption states that “The system should be designed not to flood any part of the site in a 1 in 30 year return period design storm unless a different standard is used by the Undertaker”. Southern Water designs new and upgraded surface water systems to a 1 in 30 year design. The company has in the past, and in the future will continue to, request that developers design surface water systems to the 1 in 30 year design standard. Environment Agency guidelines state that storage below ground should not exceed the 1 in 30 year design. All additional storage up to the 1 in 100 year should be provided for above ground.

Southern Water agrees that the concept that run-off from development sites should mimic the site before it was developed is sound but it must be recognised that much of the area being drained after development takes place is of land drainage origin. Sewerage Undertakers do not have a responsibility for this element and therefore it is appropriate to design systems that can deal with piped flows as well as overland flows. Above ground attenuation meets the objectives of both the Environment Agency, Sewerage Undertakers and land owners in an environmentally sympathetic way and at an economic cost.

Southern Water is supportive of the concept underpinning Sustainable Drainage Systems (SuDS). However, it is felt that it is inappropriate for all sites and that the technical thinking needs to be developed further before it can be considered for general introduction. Southern Water does not adopt SUDS systems.

Land drainage and groundwater will not be allowed to discharge into the public sewerage systems either directly or via private drains or sewers.

Balancing Ponds
Balancing Ponds will not be adopted by Southern Water. Nor will we accept on-line balancing ponds on sewers that are to be offered for adoption. The invert level of Surface Water sewers that are to be offered for adoption and that discharge to a balancing pond must be higher than that of the pondweir or overflow.
Highway drainage
The developers’ attention is drawn to Sewers for Adoption which states that the Sewerage Undertaker is not obliged to accept highway drainage to the existing public sewerage system. In areas where the existing sewer network is known to be already overloaded, or where there are viable alternatives to using the existing sewer network to serve highway drainage, the developer will be required to investigate alternative methods of disposing of highway drainage and runoff with the relevant highway authority.
Section 104 applications
Complete the application form S104, and return to Developer Services at the address given below

The completed application and accompanying drawings, calculations etc, will be checked for compliance with the requirements of the current issue of Sewers for Adoption, Southern Water addenda, the combined addendum and these guidance notes. Where the submission complies, it will be passed to a development co-ordinator who will notify you within four weeks of:

  • The acceptability of the proposal and an indication of what may be adopted.
  • Our estimated cost of the work and fee required prior to construction.
(The fee will be the greater of £515, or 2.5 per cent of our estimate of the cost of the works. Any fees already paid will be deducted from this figure. However, Southern Water will need reimbursing for re-designs.) Estimates reflect the costs Southern Water would incur in carrying out the works.

Cash deposit/surety bond.
This will be 10 per cent of the estimated construction value of the works, to a minimum value of £5,000.
Standard agreements
The necessary standard agreements will be prepared by our legal department, for which a separate legal fee is payable when the agreement is signed.

Please be aware that no amendments to this agreement will be accepted. Attempts to change the agreement will lead to delay and increased legal costs.

To enable our legal department to progress with the preparation of the agreement, the details of the surety and copies of the required drawings must be sent to Southern Water one week after notification that Southern Water accepts your proposals. Where three signatures are required on the agreement, we will require ten copies of all agreed drawings that will be annexed to the agreement and a further three copies for each additional signatory.

Construction notification
Before commencement of the works Southern Water must be notified of the commencement date in advance. The balance of fees must be paid. During construction Southern Water inspectors will visit your site.
Notice of completion and provisional certificate
When the works are complete and the majority of the premises served by the sewers are occupied, Southern Water will require a ‘notice of completion’. By this stage we will also require copies of the ‘as built’ record drawings. If after a further inspection we are satisfied that the work has been constructed to the approved standard, we will issue a ‘provisional certificate’.

The adoptable sewer or lateral drain remains your responsibility for a maintenance period of a minimum of 12 months and during this period you must carry out and pay for any repairs or maintenance. Suitably qualified personnel should regularly maintain pumping stations in accordance with the equipment manufacturers’ specifications.

CCTV Survey
No later than eight weeks before the end of the maintenance period, the sewer or lateral drain will have to be jet cleaned in order to undertake a CCTV survey.
Health and safety plan/CDM regulations
The developer’s health and safety plan, prepared in accordance with the Construction (Design and Management) Regulations 2007, should also be submitted no later than eight weeks before the end of the maintenance period. This will include all appropriate certificates/ manuals etc.
Final inspection
Any remedial works required should be rectified before the 12-month maintenance period has expired. At the end of the maintenance period we will undertake a final inspection, and on completion of any outstanding work, a ‘final certificate’ will be issued.
Formal adoption
If there are any outstanding issues such as transfer of land ownership or completion of easement agreements etc, these will need to be completed before adoption of the sewers can be considered. Southern Water will not adopt any sewer unless the sewer into which it discharges has also been adopted. When all outstanding matters have been resolved, we will issue the ‘vesting certificate’, which completes the formal adoption of the sewers. The surety (bond) can only be released when the vesting has taken place.
Materials
All pipework 300mm nominal bore and smaller must be certified by a recognised third party test body as proven capable of being jetted using pressures of 2700 psi. All ancillary equipment made of plastic materials such as chambers and elements in association with such pipework must be similarly proven capable of being jetted using pressures of 2700 psi.

Pipework of greater than 300mm nominal bore must be certified by a recognised third party test body as proven capable of being jetted using pressures of 2600 psi. All ancillary equipment made of plastic materials such as chambers and elements in association with such pipework must be similarly proven capable of being jetted using pressures of 2600 psi.

Please check your site is in the Southern Water catchment area: https://www.southernwater.co.uk/your-area

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  • Consents or licences to discharge to any rivers/watercourse
  • Hydraulic Calculations with design parameters (two-year and 30-year events) and plan showing contributing impermeable areas
  • Details of land transfers and sewer easements for sewers not in public highway or public open space
  • Location plan (1:2500 min) with the area of land in the ownership of the developer edged in green
  • Longitudinal Sections (sewer and rising mains) (1:500 horizontal/1:100 vertical)
  • Manhole and demarcation chamber schedules (1:20)
  • Planning approval
  • Pumping station details
  • Site layout plan (1:500)
  • Special construction details (1:20) e.g outfall structures, hydrobrakes etc
  • Typical construction details (1:20)

  • Site boundary clearly shown
  • Roads clearly shown
  • Adjacent buildings clearly shown
  • Private pipe run to Southern Water network clearly shown
  • Maximum file limit is 50MB
  • Allowed file types are DOCX, DOC, PDF, XLS, XLSX, JPG, JPEG, BMP, PNG, DWG (auto cad), DXF (auto cad), DGN (microstation), PRP (microstation), PRW (microstation)
  • Due to current Southern Water policies, we can only review drawings submitted in paper format in the intended scale/paper size and colour.
    We accept your drawings/plans by uploading them to the portal alternatively you can post these to our Developer Services team.
Warning! File size too big. Maximum file size 50MB.
Failure to include any of the requested information will be deemed as an incomplete application and may result in this application being delayed/returned. This application DOES NOT mean approval has been granted. No work should commence until written approval has been given by Southern Water.
The contents of the report are for direct use only by the applicant and are to be kept private and confidential. They may only be disclosed to third parties with the written approval of Southern Water. Such third parties to have no subsequent implied or other right to disclose the contents and information to any other parties.
Amount to pay
Adoption of New Sewer
£ 515.00
VAT (20%)
£ 103.00
Total Fee
£ 618.00
Do you require a VAT receipt?: *
Preferred payment method:
Application number:
Amount to pay: £ 618.00

Payments can be made directly via BACS transfer to:

Southern Water Services Ltd
Miscellaneous Income Account
HSBC Bank Plc
P O Box 125, 2nd Floor, 62-76 Park Street,
SE1 9DZ, London, England

Sort Code - 40-02-50
Account No - 81426834


(However please ensure that you confirm the application number you are making payment for in the reference line)

Please make cheques payable to Southern Water Services Ltd.
Your printed slip and cheque should then be sent to:

Miscellaneous Income
Southern Water
PO Box 4056
Worthing
BN13 3XX



Please click on ‘Print Preview’ and confirm your cheque number is on the preview slip.
Please print the slip and attach the cheque after writing the application number on the back in case they are separated.

Note: Failure to complete this application in full and provide relevant information will result in the application being delayed/returned. Southern Water may charge the developer for additional time spent carrying out assessments of submissions which are incomplete or unsatisfactory. This application DOES NOT mean approval has been granted. No works should commence until written approval has been given by Southern Water.

Please provide the following where applicable and tick the box if enclosed:

An initial deposit of £618.00 (including 20% VAT)
Drawings in accordance with SWS Specifications on pipe systems as per guidance notes
Site layout plan (1:500)  clearly showing
  • All levels related to OS benchmark
  • Site boundary (edged in green)
  • Roads
  • Adoptable sewers and lateral drains (coloured as per Appendix VI)
  • Pumping stations including compound
  • Rising mains
  • Existing Sewers
  • Road gullies/highway drains
  • Watercourses
  • Site contours
Location plan (1:2500 min) with the area of land in the ownership of the developer edged in green
Manhole and demarcation chamber schedules (1:20)
Typical construction details (1:20)
Special construction details (1:20) e.g outfall structures, hydrobrakes etc
Longitudinal Sections (sewer and rising mains) (1:500 horizontal/1:100 vertical)  clearly showing
  • Existing levels
  • Proposed cover and invert levels
  • Proposed pipe material – please refer to Southern Water’s guidance notes for pipes in 150mm - 300mm range
  • Pipe strength
  • Pipe diameter
  • Pipe gradient
  • Bedding classification and details
  • Air valves and washouts
Hydraulic Calculations with design parameters (two-year and 30-year events) and plan showing contributing impermeable areas
Copies of pumping station details including
  • Full mechanical and electrical specification of the pumps, telemetry etc.
  • General arrangement details
  • Wet well capacity/storage/time to spillage
  • Surge calculations
  • Structural calculations and drawings
  • Floatation check
  • Rising main capacity
Details of land transfers and sewer easements for sewers not in public highway or public open space
Copies of consents or licences to discharge to any rivers/watercourse
Copy of planning approval

I/we confirm that this application is complete and the information supplied is in accordance with Sewers for Adoption and Southern Water appendices and guidance notes.
I/we undertake to pay Southern Water reasonable costs incurred in preparing and processing the legal agreement in addition to the inspection fees.

Please note by signing this application you are not automatically granted technical approval or guaranteed adoption. All works to comply with Sewers for Adoption 6th edition and the interim technical addendum no.1, or Sewers for Adoption 7th Edition.

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