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白山电站一期工程装机3×300MW，为防止汛期泄流时，洪水和冲砂淤积对一期尾水出口影响，在一期的尾水出口处设置了导流墙，由于导流墙距离一期尾水出口很近，致使尾水出流受阻．通过现场测试和分析表明，导流墙严重阻碍一期3台机组的正常尾水出流，因此造成水头损失，影响发电效益．为此，提出了在导流墙上开洞的改造措施．本文采用现场实测和计算分析两种方法，论证了在导流墙底部开一个洞的安全稳定性．从而为白山电站一期尾水导流墙的现场改造提供了重要的参考依据．
Baishan Hydropower Station Phase I installed capacity of 3 × 300MW, in order to prevent the discharge of flood season, the impact of flood and red sand siltation on the export of a tailrace, set in the first stage outlet tailgate wall, as a result of diversion wall distance of a Tail water outlet is very close, resulting in obstructed tail water flow. Through the field test and analysis, it shows that the diversion wall seriously hinders the normal tail water outflow of the three units of the first phase, thus causing head loss and affecting power generation benefits. To this end, proposed in the diversion wall openings transformation measures. In this paper, two methods of field measurement and calculation are used to demonstrate the safety and stability of a hole in the bottom of the diversion wall. This provides an important reference for the site reconstruction of the tailrace drainage wall of Baishan Hydropower Station.