Villa Dolores and peripheral localities (Córdoba province, Argentina) flood risk was analyzed. They have expanded their urban area on the inactive channel of De Los Sauces River after the dam construction. Downstream receives water from 5 sub-basins whose upper basins, located in Mountains, generate the largest flash floods affecting these locations. The risk was analyzed considering the hazard in three different threat scenarios and vulnerability. The areas of greatest risk are reduced and they are confined to urbanized fluvial belt sectors in historical floodplain and low terraces. Geomorphological studies were effective for risk estimation, being irreplaceable in the hazard mapping.