The presentation which follows is taken from Pump it 2011

The National Self Build & Renovation Centre SwindonVisit www.burdens.co.uk/pump-it for further information

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Package sewage pump stations

mandatory adoption and

Sewers for Adoption7

Nick Orman WRc plc

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• Sewers for Adoption 6

• The private sewers transfer

• Mandatory adoption

• Pumping station issues

• Sewers for Adoption 7

Outline

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• Water Industry Act 1991 Section 104

• Agreements to adopt sewers on completion

• Guide to design

• All Water and Sewerage

Companies in England

and Wales involved.

What is Sewers for

Adoption?

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• Adoption only larger pumping stations

• Smaller pumping stations remained private.

• Packaged pumping stations considered too

small

• Sewers for Adoption therefore

written around bespoke designs

Sewers for Adoption 6

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• Unfairness

• Neighbour disputes

• Skills

Private sewers transfer

Issues

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• Transfer if connecting to the public sewer

system on 1st July 2011

• Automatic transfer

• Transfer if connecting to the public sewer

system on 1st July 2011

• On sewers or lateral drains

• Companies to locate with phased adoption

• Phased programme of upgrading works

• Unidentified pumping stations still transfer

Private sewers transfer -

Details

1st October 2011 – Gravity sewers

1st October 2016 – Pumping Stations

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Example

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How will new

sewers and laterals

be adopted?

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• For new connection applications

• Adoption agreement to become a condition of

connection

• Adoption of all sewers and lateral drains

created

• Must guarantee adoption

• Adoption when first water bill is sent.

• Ministers may publish standards

• Consultation in Wales

• Proposed start 1st April 2012

Flood and Water Management

Act 2010 - Section 42

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• Ministers not currently proposing to publish

standards for pumping stations

• Standards will be in Sewers for Adoption 7

• New appeals process

Standards

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• Inexperienced designers of bespoke pumping

stations

• Sewers for Adoption standards not

appropriate for small pumping stations

• Some stations unnecessary

• Location often a problem

• Access and safe working

• Alarms

• Maintainability

Pumping station Issues

Adoptions

Private pumping stations

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Examples

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• If gravity drainage possible

must be justified on whole

life cost

• Package pumping stations

preferred

• Three different size bands with

different standards

Sewers for Adoption 7

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3 Types defined

• Type 1

• Up to 0.25 l/s – Typically serving 2 to 5 houses

• Type 2

• 0.25 to 1 l/s – Typically serving 6 to 20 houses

• Type 3

• Over 1 l/s – Typically serving over 20 houses

Pumping station Types

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Package pumping stations

Wet well

Check valvesPump units

Domesticwastewater inlet Valve chamber

1.5

mm

axim

um

Gate valves

Lockable wet well cover Lockable chamber cover

Rising main

Concrete surround

Chamber

Domesticwastewater inlet

Pump unit

Gate valve

Check valve

Rising main

Lockable chamber cover

Pumping assembly Collection tank

Gate valve

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• Requirements relaxed for smaller stations

• Based on pumping station Type:

• Dedicated parking may not be required

• Secure compound may not be required

• Unrestricted access required

• Vehicular access to wet well

• Kiosk in accessible location

Location

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• Valves shall not be located

in the wet well

• Health & Safety

• Operation & Maintenance

• Private pumping stations generally have

valves in the wet well

• Extra space for separate valve chamber will

be required

Separate valve chamber

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• Pumping stations may have hazardous zones

• DSEAR ratings

• Zone 0 – frequent explosive atmospheres

• Zone 1 – explosive atmospheres likely

• Zone 2 – explosive atmospheres unlikely

• Isolation of harmful gases

• Sealing of ducts

Hazardous Areas

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• Float switches & Ultrasonic

Level Detection

• Telemetry based on station

Type

• Private pumping stations

currently have little or none

• Customers responding to

audio/visual alarm not

acceptable when Undertaker

responsible for station

• Telemetry essential

Controls