AU - Tavanpour, N. AU - Aflatooni, M. AU - Nazari, N. TI - Determination of Sub-Basins Flow Contribution to Total Flood in Khersan River Basin PT - JOURNAL ARTICLE TA - JSTNAR JN - JSTNAR VO - 20 VI - 78 IP - 78 4099 - http://jstnar.iut.ac.ir/article-1-3437-en.html 4100 - http://jstnar.iut.ac.ir/article-1-3437-en.pdf SO - JSTNAR 78 ABĀ  - This research is aimed to determine the contribution of sub-basins flow to total watershed flood in Khersan river basin located in Kohkilooyeh and Boyer Ahmad province. To do this, the rainfall-runoff model HEC-HMS was used to simulate peak runoff values for 11 sub-basins. HEC-HMS input was constructed using GIS. The results suggest that the change in different return periods is accompanied by small change in prioritization of flood-potential of the sub-basins; so that for return periods of 2, 50 and 100 years, the most contributions came from sub-basins 1 through 11, respectively. With respect to area and flow rate, contribution of sub-basins to watershed total flow was different. The effect of area was between 0.31 to 1.03 percent; namely, sub-basin 6 showed the highest rank and basin 7 showed the lowest one. With respect to peak flow rate, the effect of individual exclusion of sub-basins, resulted in contribution between 51.2 to 1004.2 m3/s, that is, sub-basin 6 showed the lowest effect and the sub basin 11 showed the highest contribution. CP - IRAN IN - 1. Dept. of Water Eng., Faculty of Agric., Shiraz Univ., Shiraz, Iran. LG - eng PB - JSTNAR PG - 77 PT - Research YR - 2017