.Investigation of flood potential Darakeh watershed using rainfall- runoff using SCS

Locating flood event using traditional methods is very difficult and often leads to errors. SCS Soil Conservation Service America has developed a method for calculating runoff. According to the accuracy of SCS-CN method in this study the SCS-CN method is used. The purpose of research is estimate of a flood risk using SCS-CN method. In this way, according to land use and soil hydrologic groups and area slope, curve number or CN are obtain. CN the averaging of watershed was shown 87 number. Using climatological stations, average of rainfall was 304 mm. The results show that in the southern part of the watershed due to the loss of vegetation, expansion of the city from the south, land use change and shape of the watershed to be taken, the probability of flooding is greater than the rest of the watershed.