I just watched a short film on a project about understanding local knowledge in the context of flooding. http://knowledge-controversies.ouce.ox.ac.uk/video/
Near the end, there's a community which the Environment Agency (EA) decided it couldn't help on the basis of a cost-benefit analysis (cba) - too few houses in the area to justify spending money on flood defences. So the community helped itself, building lots of small defences rather than a single big dam or whatever. Lots of small measures was what local knowledge suggested...  Are there communities in Wales who have been judged as not cost effective for the EA to help? And I wonder if any communities have got together to help themselves?

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