Luino F., 2002, Flooding vulnerability of a town in the Tanaro basin_ the case of Ceva (Piedmont – northwestern Italy), PHEFRA Workshop, pp. 321–326, Barcelona, 16-19/10/2002,
URL: http://www.cnr.it/prodotto/i/269402

Historical investigations covering the last 200 years (1801-2001) have shown that the Tanaro River (northwestern Italy) has been affected 136 times by flood events in different parts of its basin, with a recurrence interval of once every 18 months. During the first week of November 1994, following extremely heavy rainfall, a flood hit several areas of Piedmont and the Tanaro Valley in particular. The discharge of the Tanaro River was characterized by unprecedented peaks. Large inundations caused damage totaling over Euro 10 billion, with 38 urbanized areas along the valley bottoms flooded, 44 casualties and 2,000 left homeless. Many surveys were carried out during the subsequent weeks in the most damaged urbanized areas to identify the flooded areas, to measure the water levels and to better understand the flood dynamics. The geomorphological data were then integrated with an analysis of aerial photographs taken some days after the event. Using historical information, past floods were investigated,, taking into consideration changes in the river beds and expansion of the urbanized areas that have taken place over the last 150 years. This paper summarizes the results from a study about Ceva, a small town located in the Tanaro Basin, at the confluence of the Tanaro River and the Cevetta Stream. The town suffered many floodings in the past. A historical reconstruction of the urban development covering last two centuries demonstrates how Ceva expanded by occupying the areas of natural water expansion, showing little regard for the old inundations of Tanaro and Cevetta. For this reason, during the November 1994 flood, the damage was vastly greater than the preceding floods.

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