AN ASSESSMENT OF THE 1966 FLOOD OF THE ARNO RIVER, FLORENCE, ITALY, FROM NEW MAPPING OF HISTORICAL DATA
After the 1966 flood of the Arno the city of Florence placed permanent flood markers around the downtown area to show the extent and depth that the flood reached throughout its duration. We collected GPS and elevation data based on these flood markers in order to map the extent of the 1966 flood. The data collected in Florence has reveled that the reasoning for the unique flood pattern of the downtown area is a result not mainly from topographic features but the anthropogenic influence of the structures that run along the Arno river. The most intense flooding occurred east of the Ponte Santa Trinita in the center of Florence. In order to understand why the flooding happened in this way we analyzed the urban structures that run along the Arno River. The buildings to the East of Ponte Santa Trinita and past Ponte Vecchio were constructed directly on the shore and brace the river itself. The architecture of the buildings on the Eastern side of the Arno river created a man made flood wall. Because of this the heaviest flooding took place to the West of Ponte Santa Trinita thus heavily flooding the downtown area of Santa Croce. The maps we have created show the extent of the data collected as well as an accurate reflection of our hypothesis.