**6. Model validation**

The model has been extensively applied to different case studies, in Piemonte region, for the risk assessment and the cost/benefit analyses [14, 15].

In this work, a sort of validation of the model has been tried by comparing the IDP computed by the model and the damages recorded in the recent 2016 flood.

The term "validation" is not appropriate, as the comparison is not simple. Actually, it should be highlighted (see Section 8) that the real damages suffered by residential or commercial receptors may not be equal to the indemnifications by public administration [18]. This point will be discussed in the next paragraphs.

However, a comparison between the computed index damages and the requested indemnification for residential or commercial activities has been tried, in order to estimate the gap between the computer IDP and the available data.

In the following paragraphs, three applications will be shown and discussed, referring to 2016 flooding in Chisola river, Bormida river, and Tanaro river. A comparison between the computed IDP and the requested indemnifications is also shown.
