Runoff Estimation of Urban Catchment Using URBS-UH Model (Case Study Baharestan City)

Quantification of urban hydrologic response of catchments to rain fall is one of the most important issues in urban hydrology. Despite its importance, there is scant information by means of which required data can be obtained for quantifying hydrologic response. In this study, urban database was developed for a part of Baharestan City in Isfahan Province and using the information, the urban unit hydrograph was determined through URBS-UH model for two catchments of Baharestan. Peak of hydrograph of the first and second catchment was estimated 0.0727m3/s and 0.096, respectively. Flood hydrograph of some rain occurred previously in Baharestan was determined through the unit hydrograph. Peak discharge of flood was also measured and the efficiency of the developed model was examined based on the peak information. Nash–Sutcliffe coefficient of the first and the second catchment were estimated 0.89 and 0.79, respectively. The developed model showed good to very good performance in the pilot area.