Here's a couple of vids from the States showing the rationale behind the demolition of Condit Dam in Elwha Valley, replete with stunning footage of the moment of detonation. Although the Dam was an enormous obstruction to fish movement, fish have already started to re-colonise the river. It doesn't take any great leap of imagination to transfer the thinking behind this ecologically-driven initiative to the thousands of obstructions that still exist on UK rivers.
Thanks to WS and PG
Watch the film, 'Kelham Island Hydro', and ask whether what boils down to be a few kettles' worth of hydro-generated electricity is proportionate to the decimation of our little-understood and very fragile river ecosystems.
If you have problems viewing the film from here, please view on Vimeo or watch on Google where you can also download to your pc.