إدارة شبكات مياه الأمطار التكاملي: دراسة حالة قضاء الحر- كربلاء

Integrated Storm water Network Management: A Case Study Al-Hur District-Kerbala

Abstract

Urbanization, population expansion, and changes in the climate make cities more susceptible to flash floods, severe storms, and drainage network problems. Rainwater network management is essential for controlling flooding, forecasting behavior, and assessing fixes for operational and structural issues. In order to achieve the integrated management of the storm network of the study region, the current network will analyze and identify the total volume of floods and the amount of flooding pipelines and junctions, assess how well the storm water network is performing regarding rainfall intensity of 2, 5, 10, and 20-year return periods, and suggest the sustainable techniques to mitigate the flooding. The rainwater network will be analyzed using analytical equations in rainwater network management, in addition to analyzing the network using the stormwater management model. The results of the analytical equations of the rainwater drainage network management in the study area showed that after a ten-year period of return, the system seems to be unable to release excess rainfall, which causes storm water to accumulate downstream. These results were consistent with the simulation results using the storm water management model. Storm Water Management Model (SWMM) software was utilized since it contains the components required to meet the goals of the research. Based on the validation results of the model, which were the coefficient of determination R² (0.62-0.79), the Nash-Sutcliffe efficiency NSE (0.65-0.79), and the normalized mean square error NMSE (0.06-0.08). It can be concluded that the storm water management model is valid, eliminating the need for model calibration. Also, the study included modelling the techniques of low impact development (LID) for the purpose of mitigating the flooding in the storm water drainage network. In response to the increase in the rainfall intensity, volume of all floods in the drainage network, and the amount of inundated manholes ratio grew from 1220 m³ and 5% to 13450 m³ and 20.5%, respectively, while the return periods lengthened from 2 to 20 years. The suggested low-impact development (LID) approach decreased flooding volumes during various return times of 2, 5, 10, and 20 years to 793, 1708, 6947, and 11915 m³. Decision-makers can use the study’s technical assistance to build infrastructure for upcoming difficulties