Risks of Rainfall Intensity in Erbil’s Eastern Basins

Abstract

Runoff is triggered by the rainfall intensity, then it depends upon the slope, land use land cover, and soil type. Soil Conservation Service Curve Number (SCS CN) method is used in this study to estimate runoff as a hydrologic modeling method. There are 3 hydrologic soil groups in the study area (A, B, C) Ranging from Low runoff potential due to high infiltration rates (A) group to High/moderate runoff potential due to slow infiltration rates (C) group. for LULC (land use land cover) classification in the area, there are 6 types: Barren lands occupied the higher area (137) km² (36%), while vegetation represented the lowest area (3) km² (1%). The area has high values of CN, A (13) class with high values ranging between (55-94) while (2) class only (25-30), indicating high Impervious surfaces resulting in an increased runoff generation in the area. The result of SCS-CN method parameters was as follows; Q values were between (646.8-50) mm, and values of la were between (154.2-5) mm.  S values for the area between (771- 25) mm, Qv values between (582.12-45) m³, for chosen rainfall intensity for area total rainfall with (44) mm.