A few links to help you with your homework...
Boscastle Cornwall - Boscastle Village website, with various flood photos, information about the rebuilding/regeneration, and about the area in general.
TintagelWeb - loads of pohtos, taken during and after the flood.
Museum of Witchcraft - the Boscastle Witchcraft Museum, and lots of its artefacts were badly damaged in the flood, and they kept an interesting and comprehensive diary of the clean-up.
Geobytes GCSE - a useful summary and lots of links on Rob Chambers' blog.
GeographyPages - lots of useful links about Boscastle and other floods (and everything else geographical!)
And loads of articles on the BBC website... type Boscastle into a BBC search!