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彭水坝址处于高山峡谷地区，电站厂房引水系统长达８６０ ｍ 。为了较好地解决长引水系统、大跨度洞室群分布密集的难题，设计中结合实际，跟踪水电站长尾水道设计理论和实践的发展，在国内首次进行了变顶高尾水洞的设计研究，解决了“长引水系统不设调压室，且尾水系统明满流交替”的主要技术问题。用变顶高尾水洞取代调压室，既可保证电站的安全运行和减小工程投资，又避免了大跨度洞室群分布密集给围岩稳定带来的不利影响。通过厂房布置方案的比较研究，推荐采用中部开发的变顶高尾水洞方案
Peng dam site in the alpine valley area, power plant water intake system up to 860 m. In order to solve the problem of long-diversion system and large-span cavern group with dense distribution, the design of tracking tailrace design theory and practice of the hydropower station is combined with the actual design in the design. For the first time, Solved the “long diversion system does not set the pressure chamber, and the tail water system to open a full flow of alternating” the main technical issues. Replacing the surge chamber with a variable height tail tunnel can not only ensure the safe operation of the power station and reduce the project investment, but also avoid the unfavorable influence brought by the dense distribution of long-span caverns to the surrounding rock. Through the comparison of the plant layout plan, it is recommended to adopt the scheme of variable-height high-tail tunnel developed in Central China