The hydrology of the earth cover and its effect on the environmental capacity of the rainwater drainage network using the flow curve SCS-CN in Nasiriyah city

Abstract

The study aimed at identifying the impact of the rain storm on the efficiency of the rainwater drainage network in Nasiriyah city, using the SCS-CN method to estimate the volume of the surface flow. This method was adopted to estimate the volume of surface flow and the amount of rain recorded for the station (Al-Nasiriya) located in the governorate of Thi-Qar. This method was adopted to estimate the volume of surface flow and the amount of rain recorded for the (Al-Nasiriya) station located in the Thi-Qar Governorate, where the rain data for the above mentioned station was dealt with. The study of the volume of surface flow resulting from a rainstorm included a study of the flow resulting from the highest rainstorm for the period (2018-2019), which was recorded on May 19, 2019 and amounted to (138 mm/day). The study found a group of results and the most significant is that the areas exposed to the possibility of flood risks are within the neighborhoods of the city, as there is a discrepancy in the level of risk in Nasiriyah city within the zone of ​​the study area. The study recommended a group of recommendations and the most significant is the need to work on separating the rainwater network from the sewage network, whether it is secondary or main, and providing pumps and stations to the city network.