Floodplain analysis of Batman River with HEC-RAS program

Floods, shows an increase in losses as well as in terms of both the number given in the tropical zone of countries as well as the climate in Turkey as countries located outside of the zone. With the increase in unplanned settlements with the increasing population density makes it inevitable that happened in their lives and property lost as a result of the flood. Especially in recent years, starting with the Geographic Information System to enter all areas of life, based on risk analysis and flood risk maps settlement has become a priority basis as factors in planning. In this study, the floodplain analysis of Batman River between New Malabadi Bridge and Diyarbakır – Batman Highway Bridge was performed. With a lower slope ( J=0.00019) and a lot of meaders Batman River, which close to the several settlements including the city center of Batman, frequently changes its current bed. High flow rate in Batman River cause loss of life and property. 165 cross-sections is taken from the map of the study area with AutoCAD Civil 3D program.After export these cross-sections to the HEC-RAS (Hydrologic Engineering Centers River Analysis System), one-dimensional floodplain analysis of Batman River is obtained. Under the different flow rate, spatial variations of flood damage is provided. Floodplain risk analysis determine water surface profile in the natural bed of the river under Q5, Q10, Q25, Q50, Q100 ve Q500 flow rates.