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Build a tunnel to the coast

Clearly the solution to free the Thames Valley of flooding in the future will be a substantial project(s).

Present solutions appear to be at ground level and will result in considerable disruption and dare I say controversy.

Would a tunnel from the river to the south coast provide the necessary relief? The parameters could be a distance of 80km, and a head differential of 35m.

From the Lee Tunnel, it would seem that a substantial tunnel may cost £20M/ km; so for £1.6bn we may have a solution. I trust that a hydraulics expert will provide the basic answer.

Spoil, certainly from the south end, could be used to secure vulnerable coastline. Also, a hydroelectric facility could be incorporated into the design which would operate in a flow range from, say, normal to excessive.

George Muir, hkgmuir@yahoo.co.uk

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