Abstract
The study area (Halabjah District) of the Sulaymaniyah Governorate is located in northeastern Iraq, with an area of 788.06 km2. The total studied watersheds are 30 watersheds. They flow in different directions, and the area of these watersheds is 696.12 km2. The research aims to study the watersheds' hydrological characteristics and indicate the extent of their flood hazards in the study area using SCS-CN methods. The HEC-1 model in WMS 11.1 software implemented the hydrological models. Different rainfall amounts (10-500 mm) scenarios have been implemented to specify the threshold of hazardous surface runoff. This variation is a danger to various human activities. No surface runoff has developed at the rainfall of 10 mm. The result shows that watersheds (7B, 20B, and 11B) have high flood risk because of their area. Linear regression has been used to examine all suspected watersheds for flood risk.
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