Infrastructure Delivery Plan (Feb 2013) - Runnymede Borough Council

Risk Assessment
8.30 The main risks to this type of infrastructure designation are considered to be:
• contamination of the drinking water, given that the Borough relies solely on
one provider. Affinity Water have their own procedures in place however to
limit potential for contamination. As such the risk of this scenario occurring is
considered to be low.
• sustainability reductions set by the Environment Agency impacting on supply
(the Environment Agency regulate the abstraction licences issued to water
supply companies).
Risk ID Description Probability Severity
IDPR021 Contamination of water supply Low High
IDPR022
Sustainability reductions set by the
Environment Agency
Medium Medium
Conclusion
8.31 Overall, on the basis of the information provided to date, it is considered that the
existing infrastructure is sufficient to meet the development needs of the Borough over
the plan period. This chapter may however need to be reviewed when the Affinity
Water Resource Management Plan 2015-2040 is issued in March 2013 as this updated
plan may draw different conclusions from the 2010 plan in regard to how growth in the
region will be met over the plan period.
Sewerage Treatment
Existing conditions
8.32 Thames Water is responsible for sewerage treatment in the Borough, and the Chertsey
Sewage Treatment Works at Lyne Lane, Chertsey (which Thames Water own) treats
and disposes of sewage from the Chertsey Catchment Area. In 2011, Surrey County
Council granted permission for improvements to the sewerage treatment works at Lyne
Lane including the construction and operation of a sludge dewatering and cake storage
building, odour control unit and landscaped earth bund.
Local Plan
8.33 The location policies in the Local Plan; LP01-LP08, confirm where new development is
expected in the Borough over the plan period. Development would largely be focused
in the Borough’s Urban Areas and at the former DERA site in Longcross. New
development in these areas over the plan period will utilise the existing sewerage
treatment infrastructure which exists in the Borough and surrounding areas.
Future provision
8.34 Thames Water state that the projected population growth within its area will increase
demand for sewerage treatment, placing increased pressure on its treatment works and
sewerage network. It will also reduce availability and increase the cost of land required
for future sewerage development. Between 2015-2035 Thames Water aim to adapt
their sewerage system to cope with climate change. Between 2010 and 2015 in
particular, Thames Water plan to invest £4.9bn, £9 million of which is planned to be
spent on Chertsey Sewage Works. Whilst the full extent of the works proposed at
Chertsey Sewage Works are not known, it is known that it is proposed to install a new
combined heat and power unit at the treatment works which will capture the methane
produced, store it and use it as fuel, generating renewable energy (Thames Water, ‘Our
plans for 2010-2015).
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Runnymede IDP DRAFT – February 2013