Analysis of Spatial Variability of Flood Hazard in Sulaimaniyah Plain Basin: Using HEC-1 – WMS Model

Abstract

Sulaimaniyah plain basin is located in the north-east of Iraq and the east of the Iraqi Kurdistan Region. With an area of (719.81km2), this plain basin is located between the two circles of latitude (35 ° 23 '–35 ° 45 ') of the north and the two lines of longitude (45 ° 11 '–45 ° 34 ') of the east. In this study, the level of flood risk in the Sulaimaniyah plain basin is analyzed and evaluated in terms of quantity and quality of flood risk, water runoff, and flood hydrographic slope in the watersheds of the study area. In the basins of the location of the study, and by means of (GIS) and (RS), the research depends on the hydrological model (HEC-1) from the (WMS) program. In order to achieve the aims of the study, this model used a set of criteria such as slope degree, vegetation, land use, soil type, the highest amount of precipitation within (24 hours), and the shape and area of the drainage basins. The research used spatial and quantitative analysis, which concludes that the aquifers of (Kolabi, Hawarishar-Chnarok, Qularaisi, and Qrga) have an average time of concentration of less than five hours, which is shorter and more dangerous for flood hazard than the aquifer (Kani Pan), which has an average concentration time of (6,7 hours). The total annual volume of drainage from all basins in the study area is (19092695,4 m3), and the Kanipan) basin has the highest annual discharge, which is (2900403.45 m3).