Determining Flood Routing Coefficients in Mountainous Rivers using HEC-HMS Model (A Case Study: Jooneghan-Farsan Watershed, Iran)

Flood routing is an important part of flood management. Although hydraulic models are commonly employed in the routing studies, hydrological models offer more effective and suitable methods in this. Muskingum model is a commonly used hydrological model in this type of studies, which its accuracy depends on the way the coefficients of the corresponding equation (K, X) are obtained. In this research, using statistical data for the 903 km2 area Jooneghan-Farsan watershed at Chaharmahal & Bakhtiyari province, HEC-HMS model and the recorded flood hydrographs at the local hydrometric station, the effectiveness of the Muskingum model in the flood routing has been investigated. The results on the studied floods show little change in the amount of K and X, found to be 1.9 hour and 0.05 for the watershed.