The Thames Floods. March 1947. One of the most severe floods of the 20th Century, the Thames Floods were caused by 117mm (4.6 inches) of rain triggered by thawing snow after a harsh winter. It is estimated that just over 100,000 homes were flooded. The floods peaked after a week and took another 10 days to subside completely, leaving immediate damage estimated by Clement Attlee's Labour government at £12m.
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