Lee Davis, Natural Disasters (Infobase Publishing, 2010) pp169-171 With "a combination of moderately high tide, the runoff of torrential rain from the day before, and a sirocco wind blowing northward up the Adriatic", "Between Venice and the deep blue sea", by Hugh Aldersey-Williams, New Scientist (magazine), August 4, 1988, p49 the river brought the highest recorded water level in Florence, peaking at 22 feet .