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彭水水利枢纽电站的输水系统颇长。按规范规定，尾水隧洞须设调压井。调压井规模巨大，地质条件不允许开挖如此巨大规模的地下洞室群。为此，取消调压井，改用变顶高的尾水隧洞。阐述了变顶高尾水隧洞方案的提出、变顶高尾水隧洞的设计思想、主要技术问题和设计原则；介绍了数值分析和水工模型试验的进行情况。研究结果表明，变顶高尾水隧洞适应彭水电站的特点，能取代尾水调压井的作用。
Pengshui Hydropower Station long water supply system. According to the regulation, the tailing tunnel shall be provided with surge tank. Surge wells are large-scale, geological conditions do not allow the excavation of such a huge underground cavern group. To this end, cancel the surge shaft, switch to the top of the tailrace tunnel. The design proposal, main technical problems and design principles of the tunnel with variable height and high tailrace are introduced. The progress of numerical analysis and hydraulic model test are introduced. The results show that the tailing tunnel can adapt to the characteristics of Pengshui hydropower station and can replace the role of tailing surge shaft.