Applying the SWMM Software Model for the High Potential Flood-Risk Zone for Limited Catchments in Erbil City Governorate

Abstract

Every year, the vicinity of the Council of Ministers is frequently inundated. Due to the area's shifting land use and the inadequacy of the existing drainage system to handle the rising drainage loads, KRG decided to build two box sewers (BS). The drainage system in the study area will be evaluated, and the effectiveness of the BS construction in reducing flood amounts in the study area, as well as comparing the capacity of the drainage system before and after the BS construction using EPA SWMM version 5.2. The data used in this study are rain data and drainage network dimensions. Since the rain gauge station at the research area did not directly provide the 2-hour time series rainfall data, it was created using the Alternating Block Method (ABM) by determining a rainfall hyetograph from 5-year, 25-year, and 100-year Intensity-Duration-Frequency (IDF) curves. Following the specification and inputs of all EPA SWMM 5.2 parameters, six simulation scenarios were run based on the before and after adding (BS). Prior to the addition of (BS), the number of flooded nodes for the first three scenarios was (33, 31 and 28), and it was reduced to (25, 22 and 19) nodes. According to the findings, the drainage planning design for the study area is not adequate to handle the drainage load of the area, either now or in the future.