Barrage Disadvantages

The Barrage would worsen flooding west of the barrage, by displacing water that would otherwise have gone up the Severn.

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 the decomissioned Hinkley Point Nuclear Power station from inundation.

It has been suggested that a barrage would open up the whole coast line behind the barrage to urban and industrial development of marinas, waterside apartment blocks etc and vast industrial areas, whereas tidal lagoons would ensure this coastline remains undeveloped.

Why would they want marinas? Because the water would be clear and more attractive.
Coastal despoilation is a result of planning decisions. Bad decisions can be resisted.

With no barrage, the whole coastline is going to disappear anyway - under the rising sea.

See also
Birds
Fish
Siltation

Visual amenity

Effect on the wilderness

Kinlen effect from workforce coming in with foreign viruses and causing leukaemias in local children. This is very hypothetical, generally used only by the nuclear industry to divert attention from the leukaemogenic effects of radiation.

**Load factor **
The tidal flows are predictable, and the National Grid can integrate the product of the Barrage using present balancing mechanisms. If at times there is a mis-match between Barrage output and Grid demand - at times when demand is low - it is possible to enhance present balancing - arrangements using electrolysis as a balancing fine tuner.

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