Severn Barrage tidal power scheme/economic benefits and environmental costs Flashcards Preview

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Flashcards in Severn Barrage tidal power scheme/economic benefits and environmental costs Deck (4):
1

EIA negative impacts

-Loss of saltmarsh and mudflat habitats-important feeding grounds for waders and wildfowl. The estuary is a conservation wetland
-Migrating fish, such as salmon, shad and thwaite severely affected, with loss of spawning habitats
-Sediment flows in the estuary would be disrupted
-Severn Tidal bore would be reduced in size
-Problem with the dilution and dispersal of sewage waste in the absence of strong tidal currents

2

EIA positive imapcts

-Generation of renewable energy and reduction of carbon emissions (1 million tonnes per year) meet international climate change obligations
-Dunlins benefit from stable water levels
-Studies of La Rance in Brittany suggested that they can increase biodiversity, improve water quality and oxygen levels

3

CBA benefits

-Generate 5% of the UK's electrical needs
-Renewable form of energy
-Fills the UK's 'Energy Gap' as old nuclear power stations decommissioned over the next 5-10 years
-Life span of up to 150 years
-Creates 35,000 and 10,000 locally
-Provide leisure activities
-Strengthen flood defences around the Severn Estuary, act as a barrier.

4

CBA costs

-Around £20 billion
-Disruption of shipping ports such as Avonmouth
-Weston-super-Mare beaches degrade affecting tourism
-Negative impact on local fishing and the extraction of aggregates from the estuary.