The Effects of Al Chibayish Weir and Proposed Gated hydraulic Structure on Flooding in the Euphrates River in Dhi Qar Province, Iraq
Keywords:Euphrates River, HEC-RAS, Flood, Weir, Regulator
This study focuses on a 57 km reach of the Euphrates River in the Dhi Qar Governorate of Iraq, specifically from the confluence of the Majmaa River to the Al-Midaina district. The complex nature of the river system, characterized by various hydraulic structures on the main and side banks, including Al Chibayish Weir, prompted the use of a 1-D numerical model (HEC-RAS) to simulate water levels in the cities of Al-Chibayish and Al-Madina during flood season. The purpose of the study was to assess the impact of Al Chibayish Weir and nine regulators on the Euphrates River, as well as to evaluate the potential effects of replacing Al Chibayish Weir with a gated hydraulic structure in the city of Al-Madinah. Several scenarios were simulated to examine the influence of Al Chibayish Weir and the proposed gated hydraulic structure on the river system. The results of the model indicated that in the worst-case flood scenario, with the full operation of the nine regulators and water flowing to the marshes, the highest water level upstream of Al Chibayish Weir reached 3.75 m above mean sea level. The conclusion of the study was that the construction of a gated hydraulic structure could play a crucial role in controlling water levels of the Euphrates River during both drought and flood seasons.
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