The adequate management of floods is of fundamental importance either for dam safety and for the security, these dams should provide. According to statistical overviews (ICOLD, 1995 and 2003), in recent times flood events have been the main natural hazard responsible for human and economic losses and one of the main reasons for dam failures. This is particularly true for small dams with heights 30 meters or less. ICOLD classification defines as large dams those which has heights of 15 m or higher.

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