Here is a good post from the Saci Art Blog about the flood and an interesting book that I have yet to get a copy of:

A SACI publication, Dear Eddie and Popp: Letters from the Florence Flood of ‘66, includes letters written by American artist and designer, James Hogg, who witnessed the effects of the flood. These numerous, typed letters written to his father-in-law are paired with photographs by Nick Kraczyna. We are most grateful to Giacomo Hogg for allowing us to publish his father’s letters and to Nick Kraczyna for allowing his remarkable photographs to illustrate these letters.