Displaced Water

– there will be effects on the Somerset coast west of the barrage, and possibly further than Somerset, as the water that would otherwise have passed up the Severn will find somewhere else to be. An extra rise of 1 metre has been estimated.

Mitigation - a secondary barrage to protect the Somerset Coast can be built. This is extra expense, but also means extra electricity production. It will also protect Hinkley Point Nuclear Power station from inundation - a very important point.

I metre sea level rise will flood a far greater area of water if the land is flat and low-lying than if the land falls more steeply into the sea. In general, the land to the west of the Barrage comes into this category.

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