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本文结合辽宁省宫山咀水库侧槽式溢洪道的设计，探讨该溢洪道的水力计算。在岸坡较陡的情况下布置侧槽式溢洪道．可使溢流堰的长度沿库岸地形向上游延伸，泄水道修成窄深式，往往比正堰式节省工程量和投资．侧槽式溢洪道的水流为空间变量流，应用动量定理推导的基本方程进行水面线计算，在理论上比较合理，与实验观测值比较接近，对于较重要工程，应通过水工模型试验进行验证，使选用的结构尺寸更加稳妥。在宫山咀水库设计中．优选出的变宽度、变底坡的侧槽式方案，比正堰式节约投资４０多万元。变宽度、变底坡的侧槽式比变宽度、均匀底坡的侧槽式有更大的适应性。
Based on the design of the side channel spillway of Gongsunzui Reservoir in Liaoning Province, this paper discusses the hydraulic calculation of the spillway. Side channel spillway is arranged with a steep slope. The length of the overflow weir can be extended upstream along the reservoir bank topography. The drainage channels are narrow-deep and often tend to save engineering and investment over the weir. The water flow of the side channel spillway is the spatial variable flow. The calculation of the water surface line based on the basic equation derived from the momentum theorem is reasonable in theory and close to the experimental observation value. For more important projects, it should be verified by the hydraulic model test, Make the structure of the choice of more secure size. In Gongsuizui reservoir design. The preferred variable width, variable slope of the side trough program, than weir saving more than 40 million investment. Variable width, variable slope of the side of the slot than the variable width, uniform side slope of the groove has a greater adaptability.