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茅坪溪泄水建筑物是三峡工程的重要施工项目之一。茅坪溪流域属于山区性河流，受降水影响，洪水具有暴涨暴落的基本特征，一次洪水过程短则４～５ｈ，长则２０ｈ，产流汇流快。茅坪溪泄水建筑物为四级永久建筑物，承担茅坪溪枯期排水、汛期泄洪的任务，具有泄程长、落差大、断面形状变化大、弯道多的特点。根据茅坪溪泄水建筑物进口明渠中段实测的水位、流量以及降水量等资料，对茅坪溪暴雨洪水的成因、降雨迳流的关系以及隧洞的行洪能力进行分析。
Maoping River drainage building is one of the important construction projects of the Three Gorges Project. Maoping River Basin belongs to mountainous rivers. Due to the influence of precipitation, floods have the basic features of skyrocketing and sudden falling. A flood course is short 4 to 5 hours long and 20 hours long. Mau Ping River drainage structures for the four permanent buildings, to undertake the Mau Ping Creek drainage period flood, flood discharge flood season tasks, with the vent of the long, large drop, large changes in cross-sectional shape, corners and more features. According to the measured water level, flow and precipitation data in the middle section of the open channel of the Maopingxi drainage building, the causes of the storm and flood in Maoping River, the relationship between rainfall and flood and the flood control capacity of the tunnel are analyzed.