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Severn sequence

Letters

It was very satisfying to read that the Welsh Assembly has joined its voice to those pressing for this tidal power project to be very seriously looked at in the review of future energy resources.

There is a small correction to make to the article (NCE 4 May), however: The optimum location between Brean Down and Lavernock Point was not established until the Bondi Committee's work some 25 years ago.

Prior to that, the schemes considered were smaller and further upstream, English Stones being a favoured place.

As consultants to the Severn Barrage Committee, Binnie & Partners set up a model to examine possible locations from English Stones seawards.

By using preliminary costings and the characteristics on bulb turbines, the best installation, potential output and probable construction cost was established.

The line from Brean Down to Lavernock Point was found to be the best of the six or so modelled, and this location was then subjected to detailed study and preliminary scheme design.

The effect on ood levels in the tidal Severn was also looked at, and this has now taken on much greater signicance due to the inevitable rise of sea levels.

Peter Ackers, (F), ackerspp @constructionplus. net

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