Non-structural measures (e.g. real-time forecasting and alert systems, information and training campaigns, tax adjustments, flood insurance programs) are capable of modifying the consequences of unavoidable damages; particularly, flood insurance provides a way for prepaying economic losses, reducing the social impact of the event (Thomas, 1994). The net premium, defined as the annual equivalent of the occasional reimbursement to be covered by the insurance company, depends on the flooding risk of the area, that is on the probability distribution of damage.