Unsupported browser

For a better experience, please update your browser to its latest version.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

Overwater piling solves Thames reservoir supply issues

Repairs to Thames Water’s Island Barn reservoir are currently being carried out from pontoons in order to prevent disruption to water supplies and the reservoir’s resident sailing club.

Seepage issues meant that remedial work on the reservoir embankment dam was necessary and this is currently being carried out by Sheet Piling UK using sheet piles.

The reservoir, built by Sir Robert McAlpine, opened in 1911 by the Metropolitan Water Board and stores 4.5bn litres abstracted from the River Thames. The reservoir is impounded by a 2.74km long earth embankment dam with a puddled clay core that extends into the underlying London Clay.

Grouting from the crest and diaphragm wall solutions were considered after a Willowsticks survey mapped groundwater flows that were suspected from wet patches and localised slipping on the embankment face.

“Historically a reservoir like this would be drained for work to be done on its walls, but this would have meant the sailing club finding a temporary new home and also taking the reservoir out of supply, which after a dry winter and spring, we didn’t want to do,” said Thames Water construction manager Amit Chakraborti.

Sheet Piling UK is currently installing 18.3m long piles at three sites with a total linear length of 240m and work is expected to be completed in November.


Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Links may be included in your comments but HTML is not permitted.