Flood is one of the destructive hazards worldwide which effects human communities each year. Looking at the number of flood events each year shows that flood in not a event any more but is a frequent one. Although most of the flood events are made by storm and heavy rainfall but inappropriate land use policies has intensified the flood impacts. There is a balance between atmospheric and environmental factors though the multiplicative structure of the nature. The pressure of growing population and illogical application have destroyed this balance in a way that the degradation is accelerated and bring destructive events like flood to human populations.Therefore, it is necessary to identify the reasons and factors on flood events as well as mitigation methods in watersheds. The best way for this is the hydrologic priority analysis of the watersheds in relation to flood creation. The present study is applied in Jiroft dam watershed to identify flood high potential basins using RS, GIS and HEC-HMS techniques. The map of soil hydrologic group was first prepared using GIS on the basis of soil group map. Joining the hydrologic group and land use map provided by Landsat and ETM + imagine, the curve number map was produced. The digital elevation map was then prepared based on topographic 1:25000 map and the hydrologic basins were identified using HEC-GEO HMS and ArcHydro softwares. The peak floods of the basins were then simulated using HEC-HMS.Using curve number, lag time, area and rainfall for flood potential index, F% ,f the flood potential for each basin was calculated. The results show that K 4 and K 6 basins have the highest flood potential index and the flood potential increases toward upstream Jiroft Dam watershed and the upstream branches have the higher participation in flood at the . outlet of the watershed. The check dams could be appropriate management strategy to reduce flood potential in these basins according to the curve number map and rock land cover of them but biologic practices are recommended for sustainable development of the watershed. Key words : Flood potential, RS and GIS techniques, HEC-HMS model, K 4 and K 6 basins, Jiroft Dam watershed
