CURRENT PROJECTS

Holes Bay Flood Defences 2018

 

New flood defence structures for the Creekmoor and Sterte Channels, housing tidal valves to prevent tidal water travelling back up the channels during high tides.

LEAD AUTHORITY

Borough of Poole

WORKING WITH

START DATE

26th March 2018

LAST UPDATED

12th June 2018

The Creekmoor Channel

The Creekmoor Channel

The Sterte Channel

The Sterte Channel

Project Overview

Flood defence structures are to be constructed at the end of the Creekmoor and Sterte Channels where they meet Holes Bay. The structures will house tidal valves which will prevent tidal water travelling back up the channels during high tides. Ground levels around the structures will also be raised using recycled soil to continue the line of flood defences in these areas.

  • The works at Creekmoor started early April and were completed, to schedule, on 30th May; a progress report & flood defence design information can be found below.
  • The works at Sterte follow the Creekmoor project; materials & equipment were delivered to site on 30th May; the project will take around 9 weeks.
  • Working hours are 7.30am – 5.30pm, Monday-Friday, however there may be some working outside of these times for activities that are affected by the tides.

Poole Council has worked with the Environment Agency and Wessex Water to secure funding of some £700,000 to deliver these flood defences.  The work will be carried out on behalf of Poole Council by Avon Construction Ltd.

Maintaining access during the works

Public use of the Holes Bay footpath will be maintained throughout the works, through the use of minor diversions or temporary paths.

Some road lane closures around the sites will be necessary to offload machinery and large deliveries. These will be carried out during off-peak hours on specific days and will be advertised on road signs.

Creekmoor channel project completed

The structure across the mouth of the channel is constructed from two rows of sheet piles driven into the seabed and filled with concrete.

The flood defence structure here forms a bridge with foot/cycle way across the channel, an improvement on the previous route that took pedestrians & cyclists via a ‘dog-leg’ close  to the busy Upton Bypass.

A ‘fish friendly valve’ is included in the Creekmoor structure to ensure eels are not restricted in their migratory movement through the surface water system from Holes Bay to waterbodies upstream, e.g. Creekmoor & Millfield ponds. There is no evidence to suggest fish or eels use Sterte channel. This is because it has a concrete base and sheet pile walls, as well as a pumping station which restricts any movements upstream.

Sterte channel

The structure across the mouth of the channel will be constructed from two rows of sheet piles placed on to the existing concrete base, and filled with concrete.

Why is the work needed?

It has been recognised that parts of Poole are likely to face a higher risk of flooding due to sea level rise in combination with a more frequent occurrence of wet and stormy weather. This project is one of the defence measures identified to help minimise the flood risk.

References