Content

7.1

A failed culvert in Sheffield
City Council ownership on Clough Dike in Deepcar has been
presenting a significant risk of flooding for some years and
requiring ongoing and reactive operations to prevent a repeat of
the flooding of 9 homes in November 2019. The temporary
arrangements, although having avoided a repeat of the property
flooding, are expensive, circa £80k per year, and at high
risk of failure. October 2023’s Storm Babet came very close
to a repeat of property flooding.

 

 

7.2

A bid for £1,390,163 of
FCERM GiA and £112,000 of Local Levy to the Environment
Agency to fully fund the project has been successful and the
Council are able to progress to a permanent fix of the failed
asset.

 

 

7.3

RESOLVED
UNANIMOUSLY: That the Transport,
Regeneration and Climate Policy Committee notes the successes set
out in this report and supports the progression of the project into
delivery.

 

 

7.4

Reasons for Decision

 

 

7.4.1

As well as the strong economic
case for this, now fully funded, permanent repair the wider risks
associated with the current arrangement already laid out in this
report further support the need for change.

 

 

7.4.2

The removal of our ongoing
revenue liability for the flood mitigation and the significant
reduction in flood risk to people and property further recommends
the need for this work.

 

 

7.5

Alternatives Considered and Rejected

 

 

7.5.1

A copy of the Outline Business
Case as submitted to the Environment Agency is available on
request. The short-listed options appraisal considered 2 possible
methods of culvert repair which were both shown
to be cost beneficial over
continuing the current arrangements.

 

 

7.5.2

Full details of the proposed
works are available on request. The works will consist of caisson
excavation of the blockage and remediation of the remaining culvert
using ultraviolet cured in place pipe lining techniques (UV CIPP).
The section of collapsed culvert will then be replaced allowing the
entire concrete section of culvert to be remediated using a UV cure
in place liner.