为宣泄水库、河道、渠道、涝区超过调蓄或承受能力的洪水或涝水，以及为泄放水库、渠道内的存水以利于安全防护或检查维修的水工建筑物。 泄水建筑物是保证水利枢纽和水工建筑物的安全、减免洪涝灾害的重要的水工建筑物。
三峡水利枢纽主要由拦河大坝及泄洪建筑物、水电站、通航建筑物组成。
The main structure of the Three Gorges project consists of the water impounding dam, flood releasing installations, power plants, and navigation facilities.
合理布置泄洪建筑物，解决下游消能防冲问题是该电站设计的关键技术问题之一。
One of the key technic problems of designing the plant is the rational layout of flood discharge structure to solve downstream energy dissipation and anti scour.
通过比选最终确定为三心圆单曲拱坝，坝身不布置泄洪建筑物，从而实现了碾压混凝土的快速施工。
Through the comparison the three center single arch dam was finally selected, thus high speed construction of the roller compacted concrete can be put in practice.
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