Sivas Dört Eylül dam is constructed upstream of Sivas city, the river runs throuh the settlement and discharges to Kızılırmak river. The project aims preparation of flood hazard maps for the main reach and its tributaries, identification of measures to control the floods, feasibility report and detailed design of proposed structures. 2-D hydraulic modeling is used for determination of flooded lands for different frequency floods, dam break analysis is performed as well.