DETERMINING SYNTHETIC UNIT HYDROGRAPHS AND PARAMETERS FOR 4 TURKISH BASINS

For determining design discharges for hydraulic structures, it is nece ssary to determine the unit hydrographs of the corresponding basins. I n Turkey, suitable data to determine the unit hydrograph of a basin ar e not easy to find, therefore unit hydrographs are usually determined synthetically. Coefficients used in the synthetic unit hydrograph dete rmination are taken from studies made for specific areas in the world. In this study, unit hydrographs are determined for four subbasins in northwest Anatolia. Using the characteristics of these unit hydrograph s and of their subbasins, Snyder's synthetic unit hydrograph coefficie nt are determined, and relationships between coefficients and basin ch aracteristics are searched.