%0 Journal Article %T Performance of HEC-HMS Hydrological Model in Simulation of Flood Hydrograph in arid and humid watersheds %J Iranian journal of Ecohydrology %I Faculty of New Sciences and Technologies, University of Tehran %Z 2423-6098 %A Yousefi, Hossein %A Golshan, Mohammad %A Pirnia, Abdollah %D 2018 %\ 03/21/2018 %V 5 %N 1 %P 319-330 %! Performance of HEC-HMS Hydrological Model in Simulation of Flood Hydrograph in arid and humid watersheds %K Flood %K simulation %K Hydrograph %K Kasilian %K Kardeh %R 10.22059/ije.2018.240802.715 %X In these studies the ability of hydrological model HEC-HMS was used for simulation the six flood hydrograph in Kasilian watershed with 67.8 km2 area with semi-humid to the humid climate and in Kardeh watershed with 93.2 km2 area with completely dry climate. Rainfall hyetographs data with minute time step and related flood hydrographs were entered to model; so floods hydrographs were simulated with 30 minute time step. Parameters sensitivity analysis by trial and error methods showed that the CN parameter have high sensitivity than the others. The CN parameter sensitivity in the arid area is higher than humid area. The R2, NS and CP coefficients with cubic meters per second unit were used for model performance. The values of these coefficients in Kasilian watershed for simulated floods were between 0.84 to 0.93, 0.78 to 0.81, and 96.13 to 188, respectively. In Kardeh watershed these coefficients calculated between 0.76 to 0.89, 0.71 to 0.75 and 113.4 to 216.7, respectively. The results showed that the model performances are acceptable in both watersheds. But in the humid watershed the model had high performance for watershed management implement works than the dry watershed %U https://ije.ut.ac.ir/article_64955_361acd6ff381ce05b1e281ef1ac87cfe.pdf