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Wimbleball Dam maintenance project


image depicting Diagram of the drilling process
Diagram of the drilling process
South West Water and Wessex Water, which both take water from Wimbleball Lake, are carrying out a joint maintenance project on the dam which started in January 2013.

The work involves injecting grout into the bedrock to block fissures and prevent water ingress. This is being carried out by drilling through the ground from the land side and from the top of the dam using drilling rigs.

How the work may affect you
In the interests of safety, there will be occasions when the bridleway next to the dam and the permitted footpath across the dam will be closed. However, it is our intention to maintain access whenever possible.

Our environmental commitment
We are committed to carrying out work in an environmentally considerate way. Under the guidance of an ecologist we have removed some self-seeded trees and there will be removal of scrub near the dam to provide a level stable platform for the machinery.

Latest update

Work has progressed from grouting trials to full grouting. The trial bore holes from the first part of the project provided a useful insight into nature of the rock and the resulting quantity and make-up of grout required.

However, the trials have also indicated that the underlying geology is more variable than previous work has indicated.  As a result the design of the grouting process has been adjusted and the work will take slightly longer to complete.

Site Representative Mike Bryant said: "We're disappointed that this project will take longer than originally planned, but this is a major maintenance project on the dam and it is essential that the foundations are thoroughly investigated and the correct engineering solution is applied.

"We're deeply grateful for the patience of all the people who like to enjoy the dam and the surrounding area and we ask them to bear with us for a bit longer. We hope to be off the site by Spring 2014. Please check the website for updates."

Location of main works

The map shows the main area of work in relation to the dam

Map of Wimbleball dam and location of works




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