Developing Unit Hydrograph Using Clark Model(Case Study Poledoab Catchment, Iran)

Abstract

River flow management requires discharge estimation. Unit hyograph is an efficient method to flood hyograph simulation. There are several models to create unit hyograph. Clark model is one of the most widely used methods to produce unit hyograph with its efficiency depending on the accuracy of estimation of storage coefficient and concentration time. In this the assessment of simulated unit hyograph 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 accep ted simulation of peak time and peak discharge. Also, this model has accurate performance in large basins.