Ecology, Environment and Conservation Paper

DEVELOPING UNIT HYDROGRAPH USING CLARK MODEL (CASE STUDY: POLEDOAB CATCHMENT, IRAN)

Mehdi Fuladipanah and Reza Jafarinia

Abstract

River flow management requires discharge estimation. Unit hydrograph is an efficient method to flood hydrograph simulation. There are several models to create unit hydrograph. Clark model is one of the most widely used methods to produce unit hydrograph with its efficiency depending on the accuracy of estimation of storage coefficient and concentration time. In this the assessment of simulated unit hydrograph using Clark model has been investigated in Poledoab catchment, Iran. ARCGIS was used to evaluate physical properties of catchment in order to plot isochrones curves and time-area histogram. These curves were used to calculate storage coefficient and concentration time of catchment. The results showed that the Clark model has accepted simulation of peak time and peak discharge. Also, this model has accurate performance in large basins.