Developer Services - Yorkshire Water...design , layout and technical requirements of s104 site We encourage all Applicants to enter into pre submission discussions in relation to S104

Developer Services Developers Guide to the Adoption of New Sewers (S104)

November 2017

Yorkshire Water | Developer Services | Developers Guide to the Adoption of New Sewers (s104) 1

General

The purpose of this document is to provide

developers and designers with a guide on how to

apply for the adoption of new sewers. The guide

provides information on how to apply to have new

sewers adopted under Section 104 (S104) of the

Water Industry Act 1991.

The Sewerage Technical Team is responsible for

undertaking technical assessments on all sites put

forward for adoption, through to the issue of

Technical Approval, undertaking of site inspections

during construction and issuing the Final Certificate

and the Vesting Declaration on adoption of the

assets put forward within the S104 Agreement.

The structure of the team responsible for delivering the end to end adoption of new sewers process is detailed below.

Contact Us Email: [email protected]

Website: www.yorkshirewater.com

Phone: 0345 120 84 82

Post: Yorkshire Water, Developer Services (Sewerage Technical),

PO Box 52, Bradford BD3 7AY

SENIOR ENGINEER

Responsible for Site from Receipt of

Application to Issue of Technical

Approval

Wendy Mullaney

TECHNICIAN

Responsible for undertaking technical

assessments of s104 sites / s102 sites

/ Minor s185 / s116 / s115

Imtiyaz Nadat

Linda Lancaster

Chris Cooke

Hollie HansellChris Long

Bethanie Scully

SENIOR ENGINEER

Responsible for Site from Issue of

Technical Approval to Adoption

Jenny Henman

AGENT

Responsible for H4s, Demolitions,

Vesting Assets, Telemetry and

Asset Integrity Requests

Barbara Davis

Sarah Riley

Reuben Thornton

SCHEDULERSue Hutchison

SEWERAGE TECHNICAL TEAM LEADER

Natalie Drake

DEVELOPER SERVICES INSPECTORS (SEWERAGE)

NORTH / WEST AREA Rob Vasey

Michelle Shackleton Daniel Tunnacliffe

Oliver Escreet

SOUTH / EAST AREA Jack Gilmartin Martin Ineson

Trevor Williamson Bill Medlock


Adoption of New

Sewers (S104)

All submissions for new sewers being offered for

adoption should be made, via the submission of an application form, in accordance with

‘Sewers for Adoption 6th Edition’ or ‘Sewers for

Adoption 7th Edition’, published by the Water

Research Council (WRC), and Yorkshire Water’s

Standard Details.

Sewer Connections

For information on how to connect to the public

sewer network, please refer to our ‘Making a New

Connection to Public Sewer’ guidance document and

the ‘Notification of Connection(s) to Public Sewer(s)’

form on our website.

If you are offering new sewers for adoption, you are

still required to complete the ‘Notification of

Connections to Public Sewer’ form and submit this

alongside your ‘Application for Adoption including

Lateral Drains and Sewers’ form.

No work can be carried out on the public sewer

network without written approval from Yorkshire

Water for your contractor to do so. Our Developer

Services Inspector will monitor the work as it takes

place. We highly recommend that you use a suitable

qualified and experienced contractor to undertake

the works.

Land and Highway Drainage

Yorkshire Water has no legal duty to accept highway

drainage from new developments into the public

sewer network. However, we may consider highway

drainage as part of the overall surface water

drainage strategy for the site. All applications will be

considered by the ‘Sewerage Technical Team

Highways Drainage Panel’ on a site specific basis.

We will not consider land drainage discharges to the

public sewer network.

Discharging to a Water Course

If the surface water is discharging to a watercourse,

it is the developers responsibility to obtain

permission to discharge at an agreed rate from the

relevant Authorising Body.

Written confirmation from the landowner with regards

to the location for the outfall will be required.

The landowner will need to be party to the S104

Agreement.

Sewer Diversions (Developer Led)

A developer must receive approval from Yorkshire

Water and have a signed Agreement in place,

supported by a bond, prior to diverting any part of an

existing public sewer and making the flows live.

Please refer to our ‘Guidance Notes for Section 185

Sewer Diversion’ that can be found on our website.

Sewer Requisitions

If you need to carry out any work within third party

land, the land owner will need to be party to the S104

Agreement.

If you cannot get permission to cross third party land

to outfall to a public sewer, you can apply under

Section 98 of the Water Industry Act for Yorkshire

Water to undertake these works, on your behalf, at

your cost.

Please refer to our ‘Guidance Notes on Sewer

Requisitions’ that can be found on our website.

The Application Process

The applicant must complete an ‘Application for

Adoption including Lateral Drains and Sewers’ form.

This needs to be completed in full and submitted to

Developer Services along with all the required

supporting information to define the application as a

‘complete submission’.

On receipt of your application, your submission will

be reviewed by the Senior Engineer and you will

receive an acknowledgement letter. We will provide

you with an ‘acknowledgement letter’ within 14

calendar days to advise you if your submission is

‘complete’, ‘substantially complete’ or ‘incomplete’.

If your submission is deemed to be ‘incomplete’, we

will provide you with details of outstanding

requirements and a list of missing information. The

application will not be assessed until the outstanding

information has been provided.


If your submission is deemed to be ‘complete’ or

‘substantially complete’ we will provide confirmation

of this and pass your submission to a Technician

who will commence the technical assessment of the

site and be your point of contact throughout the

assessment process.

Requirements of a Complete Submission

You are required to submit a ‘complete application’

for all sewers being offered for adoption in

accordance with ‘Sewers for Adoption 6th Edition’ or

‘Sewers for Adoption 7th Edition’, published by the

Water Research Council (WRC), and Yorkshire

Water’s Standard Details.

Following receipt of an application, the Technicians

commence their assessment using the ‘Standard

Checklist’ as a reference guide.

Please note that each site is considered on its own

merits and site specific detailed requirements are

excluded from the ‘Standard Checklist’. These

additional requirements, outside the scope of the

‘Standard Checklist’, will be discussed with you

either following receipt of the complete application or

you may wish request a meeting prior to submission

of a formal application to discuss the site specific

details.

The Assessment Process

Pre Submission Requirements

Planning Approval

Connection Approval

To minimise delays in having the S104 application progressed it is

recommended that prior to submission, the Applicant consults with the

Developer Services Sewerage Technical ‘Planning’ Team. This team will

determine the possibility of connecting your foul and surface water systems

to the public sewer i.e. the point of connection and the discharge rate, and

will confirm with the Applicant that Planning Approval is in place

A separate S106 Sewer Connection Application should be included with the

submitted S104 Application details. The Sewer Connection Application will

be assessed and approved separately from the S104 Application, providing

the criteria for the S106 has been adhered to i.e. Planning is approved, type

of connection and materials are satisfactory. The payment for the S106

Application will be included within the S104 fees which will be invoiced to

the Developer when the S104 Application is issued Technical Approval.

Submission of ‘Complete

Application’ by Applicant

A paper copy of the S104 Application form should be completed and

submitted alongside one paper copy of the relevant drawings, hydraulic

calculations, required technical requirements as detailed within the

‘Developers Checklist for Submission’ which is incorporated within the S104

Application Form. This details the requirements of a ‘complete application’

in line with Water UK requirements.

Pre Submission

Discussions in relation to

design , layout and technical

requirements of s104 site

We encourage all Applicants to enter into pre submission discussions in

relation to S104 Applications. Please contact us on 0345 120 8482 if you

wish to have a meeting with our Senior Engineer to discuss site specific

details.

YES

YES

NO


Receipt of

Acknowledgement Letter for

‘Complete Application’

issued by Senior Engineer

On receipt of the S104 Application into Yorkshire Water, the Applicant will

receive an acknowledgement letter (within 5 calendar days) and a S104

safe receipt letter (within 14 calendar days). The S104 safe receipt letter

will inform the Applicant whether there is enough information within the

application for a Technician to undertake an Initial Assessment. The letter

will also advise the Applicant of which Technician will be dealing with the

site and the associated timescales for response

Initial Assessment

undertaken by Technician

against checklist

The Technician assigned to the site will undertake their Initial Assessment

in line with the Standard Checklist. The checklist outlines a list of

requirements the Technician uses to assess the technical details of the

requirements against. Each site is considered on its own merits and site

specific requirements are excluded from the Standard Checklist. These

additional requirements, outside of the Standard Checklist, will be

discussed with you either following receipt of a complete application or we

invite you in prior to submission of a complete application to discuss site

specific details

Further Information

Requested

Once the Technician has completed their Initial Assessment, they will

issue a Technical Assessment Letter that details any further information

that may be required for them to complete their assessment

YES YES

Preparation and Issue of

Draft Legal Agreement

Upon issuing Technical Approval, the Technician will request the required

amount of drawings, along with confirmation of all parties included within

the Agreement and the Solicitor’s details. This information is needed to

enable us to prepare and issue the Draft Agreement

Preparation and Issue of

Engrossed Legal Agreement

On return of the Draft Agreement, the Technician will issue an Engrossed

Agreement to the Developer / Solicitor for signing. Typically, three copies

will be issued, one each to the Developer, Surety and Yorkshire Water. On

return of the Signed Engrossed Agreements, Yorkshire Water will sign and

date the Agreements and return copies to all parties, retaining a copy for

our records.

Technical Approval IssuedOnce all ‘further information’ has been submitted and assessed by the

Technician, and deemed to be satisfactory, the Technician will issueTechnical Approval.

NO


The Adoption Process

Once the site has been fully constructed, is 51%

occupied, the S104 Agreement has been signed by

all parties and all fees have been paid, the developer

can then request for the site to be put on an agreed

maintenance period. To facilitate this, we require

copies of all the ‘as built’ drawings included within the S104 Agreement, details of the constructed

manholes, long sections, sewer lengths and details

of any ancillaries (such as flow control devices) to be

submitted, alongside the O&M Manuals (if there is a

pump station on the site).

Our Developer Services Inspector will then inspect

all sewer lengths being offered for adoption, against

the ‘as built’ drawings. This could be either a CCTV

survey or a Light Line survey, depending on the pipe

material. We will then notify you of any defects and

these will need rectifying, and another CCTV survey

submitting as evidence the remedial works have

been carried out satisfactorily.

Once the Developer Services Inspector has

confirmed that they are happy with the condition of

the sewers, all remedial works have been

undertaken and all conditions of the S104 Agreement

have been met, we will issue a Provisional Certificate

of Completion.

For some sites the Bond monies will be reduced /

released along with the issuing of the Provisional

Certificate. A retention will be applicable for sites with

pumping stations. Typically, the site will be put on a

12 month maintenance period. During the

maintenance period, the developer is still responsible

for the private system.

At the end of the 12 month maintenance period, our

Developer Services Inspector will undertake a Final

Inspection of the works and advise the developer of

any remedial works that may be required.

Once all remedial works, the legalities and the ‘as

built’ drawings have been completed to our

satisfaction, you will be provided with a Vesting

Declaration for Adoption of the system. The sewer

records will be updated accordingly.

For sites with pumping stations and detention basins,

a formal handover with Yorkshire Water Operations

will be required. Following the handover meeting,

Yorkshire Water will take over ownership and

maintenance of the public sewers. This will conclude

the developers obligation under the S104 Agreement

The Inspection Process

Construction work should not begin until we have a

copy of the F10 notice, the site has been issued Technical Approval and the S104 Agreement has

been signed by all parties.

A pre-start meeting can be arranged between the

Contractor and / or the Developer and a Developer

Services Inspector to discuss the details agreed and

ensure the technically approved drawings are going

to be referred to during the construction phase.

During the construction phase, at the request of you

or your contractor, our Developer Services Inspector

will undertake a number of inspections to ensure

compliance against the technically approved drawings

and in accordance with the S104 Agreement.

If you would like a Developer Services Inspector

to visit your site before Technical Approval is issued,

there is an option of paying an upfront non-refundable

fee to Yorkshire Water, allowing you to start

construction work on site (at your own risk) and for

inspections to commence. However, the S104

submission must have been assessed and

considered to be ‘technically satisfactory’ and all

supporting documentation have been provided. All

associated S104 fees must have been paid prior to

works commencing. This is not a preferred option

due to the fact that works inspected are not

guaranteed to be satisfactory until the system has

achieved Technical Approval and may have to be

altered.

Any changes to the technically approved design,

during the construction phase, must be brought to the

attention of the Developer Services Inspector. These

must be agreed in writing and any significant

variations from the S104 Agreement can be recorded

and amendments made where necessary.

Issue: November 2017


Checking the

Design of Adoptable

Sewers

The checklist details the following technical aspects

of the submission that are assessed on receipt of a

new S104 application:

completeness and format of the submission

the developer programme of works

site location plan

site layout plan

longitudinal sections

manhole details and manhole schedule

flow control manhole details

Following receipt of an application, the Technicians

commence their assessment using the ‘Standard

Checklist’ as a reference guide.


Standard Checklist

Planning

Confirmation that Planning Approval has been granted :

We require confirmation of permission to discharge surface water, the flow rate and the point of connection

We require confirmation of point of connection for foul sewerage

We require confirmation that Highway Drainage to proposed adoptable sewer has been ‘agreed’

We require confirmation of Surety Details, Landowner / Adjacent Landowner details have been received as

part of the application

Developer Programme of Works

We require confirmation of the estimated construction start date.

Please note - no sewer works to be carried on-site until ‘Technical Approval’ is issued.

If the developer opts to start works on site prior to this, they do so at their own risk and we will send out an

‘Early Start on Site’ Letter

Site Location Plan

Site Location Plan details must be:

at a minimum scale of 1:2500

showing the site boundary edged in green with the location and value of the OS Benchmark used and the OS

map reference for the site.

Site Layout Plan

Site Layout Plan must show:

the North Point

site contours

direction of flow, pipe material, pipe size and gradient on all main drains and sewers

the proposed sewerage layout is consistent with any agreed Drainage Strategy for the area

any existing public sewerage assets affected

that there is no possibility of back flooding from sewers. We require confirmation of private drainage drawing

with cover levels shown

layout drawing drawn at minimum of 1:500 scale

connections to existing (public) sewers, have the existing invert / soffit level detailed and verified on site

that manholes are located correctly. Manholes are required at every change in direction, change in pipe size,

change in gradient and located to facilitate connection with a public sewer

the maximum distance between manholes is typically 150 metres a 3 metre wide vehicular access to any chambers containing a flow control device and headwall on any

detention basins, to within 5 metres of the maintainable asset. This should be to highway construction and

surfaced with bitmac or concrete

a turning area to avoid a 4,000 gallon tanker reversing more than 20 metres

a protected strip if any of the prospectively adoptable sewerage is located outside the highway and through

plots that are to be sold, in accordance with Sewers for Adoption 6th

Edition, and shown yellow on the plan


kerb lines and service strips / margins are at least 1 metre away from the centreline of the prospectively adoptable sewer and at least 0.5 metre from the outside edge of prospectively adoptable manholes

any prospectively adoptable sewer is located at least 5 metres away from any proposed planting and is positioned at least 3 metres from an existing tree

the minimum size and gradient of the gravity sewers to provide a self cleansing regime. This is site dependant but where fall is available we would look for this to be utilised, where it is not, then the 1 in 150 rule would become applicable. Obviously 1 in 120 is better than 1 in 135, but 1 in 80 is even better still

a manhole being built at every junction of a public / adoptable with a private sewer, serving more than six properties

Please note – we will not accept ground water, land drainage and / or filter drains connected (directly or

indirectly) to the (prospective) public sewer network

Please note – a Right in Perpetuity will be required for vehicular access to the maintainable asset

Please note – a Deed of Grant of Easement will be required for any on site prospectively adoptable sewerage

located outside the highway and through plots that are not to be sold AND /OR if any of the off site prospectively

adoptable sewerage is located outside the highway

Please note – the pipelines which only serve the adoptable highway cannot be adopted under Section 104 of

the Water Industry Act. The applicant will need to discuss these pipelines with the Highway Authority and

incorporate it into the road adoption agreement. These pipelines must be labelled as ‘Highway Drain’ on the site

layout plan submitted to Yorkshire Water

Please note – a separate Section 116 and / or Section 185 Agreement will be required for work on existing live

public sewers within the site boundary

Where possible:

where there are two separate road gullies into a manhole, remove one of the gullies from the manhole and

connect it via a junction pipe to the other gully leg

road gullies should connect via junction pipes to the existing / adoptable sewers and not directly to manholes

(except where they are at a head of a system)

Longitudinal Sections

Longitudinal Sections must:

be drawn at Scales 1:100 vertical and 1:500 horizontal

show existing ground level

show proposed cover and invert levels

show pipe material, pipe strength, pipe diameter and type S bedding

show gravity sewers connected soffit to soffit, where there is a change in pipe size

show offline surface water storage laid invert to invert

show where the depth of cover to top of sewer is less than 1.2 metre in highways and verges (or less than 900mm in none vehicular access areas), a 150mm reinforced concrete slab should be provided above granular bed and surround

show foundation of plots in relation to the proposed sewers

eliminate unnecessary crossovers

show filled ground that has been back filled and consolidated under the supervision prior to any works on the sewer starting


Manhole Schedule

Adoptable manhole schedule must:

should be constructed in accordance with Sewers for Adoption 6th Edition

show kitemarked cover slab

show the opening in the cover slab, in accordance with Concrete Pipe Systems Association (2004)

show manhole covers with a clear opening of 600mm and be Class D400 to BS EN 124 with 150mm deep

frames in highways

backdrops should typically be brought up to the top of the benching to avoid silting

show manholes over 6 metres deep to invert with an intermediate landing with handrails and safety chains

fitted around the opening. Two double rung step irons should be set vertically in the chamber walls to act as

hand grips when stepping off the ladder onto the landing

Please note – we do not accept Type C brick manholes. Our preference are Type B manholes with 1200mm

diameter or 1500mm diameter rings (opening must be sited over channel where depth of cover to pipe soffit is

less than 1.5 metres)

Flow Control Manhole

The flow control manhole details must show:

the model, the make, the head and the flow rate

the penstock details and the manufacturers details

the minimum diameter of the flow control manhole is 1800mm the cover should be a double twin 600mm x 600mm D400 with a fall arrest grille. Step irons / ladders are

not required the drain down pipe being the same diameter as the outlet pipe

the width of the sump being a minimum of 450mm from the base ramp to the front of the flow control unit

the invert level of the outlet / drain down pipe being 50mm lower than that of the inlet pipe (to ensure no standing water over the landing area within the manhole)

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Developer Services - Yorkshire Water...design , layout and technical requirements of s104 site We encourage all Applicants to enter into pre submission discussions in relation to S104