通过 GHAZI- BAROTHA水电工程尾部节制闸水工模型试验 ,获得了过闸流量 -开度 -尾水位水流特性曲线。分析比较了理论计算与试验实测过闸流量 ,对过闸流量与尾水位作了相关分析 ,经试验数据回归分析计算 ,提出了计算闸孔淹没出流时淹没系数的经验算式 ,改进了传统采用查图表获得淹没系数的不便方法 ,为尾部节制闸调控系统控制闸门开度提供了科学依据 Through the GHAZI-BAROTHA hydropower project tailgate hydraulic model test, obtained flowgate - open - tail water flow curve. The theoretical calculation and experimentally measured overrun flow were analyzed and compared. The correlation between the overrun flow and the tailwater level was analyzed. Based on the regression analysis of the experimental data, an empirical formula for calculating the submerged coefficient during flood out of the gate was proposed, The inconvenience of finding the flooding coefficient of the chart can provide a scientific basis for the control of the opening degree of the tailgate control system