Modern building and grading techniques can mitigate flooding. In Chaperel Valley and across in the low down area of Cranston when they built in this area they raised the ground level to prevent flooding. From a few people I work with who live in those areas they got away without any flooding in basements.
My thought is that everything built in the hundred year flood plain should need a plan to mitigate the effects of the hundred year flood. Wether its berms, dams, sumps, raising ground level, elimination of basements there should be an engineering design to prevent hundred year flood events.
Also based on whatever this flood costs us we should invest a similar amount into flood prevention methods for the next 100 yr flood event. For 2 to 3 billion how good of anti flood system of spillways and larger dams could we build?
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