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1996年 ,下勒索加水电站的引水隧洞在运行 40多 a后 ,首次排干水 ,进行检查和检修。预料地质侵蚀、塌方和钢结构腐蚀会引起破坏 ,但实际情况却相当好
In 1996, the water diversion tunnel of Lower Leoshao Hydropower Station operated for more than 40 years and drained water for the first time for inspection and overhaul. It is expected that geological erosion, landslides and steel corrosion will cause damage, but the actual situation is quite good