Yanghe reservoir operation

In July, 1. 1.962, the discharge of the water conveyance tunnel 1.49 m3/s, which was restored after the tailrace was destroyed. A stilling sill with a height of1.6m was added at the tail of stilling basin, and a second energy dissipation project was added. 2. 1962 ~ 1964, the dam slope was damaged by wind and waves for three consecutive years, and then it was repaired in 1964 and changed to concrete jointing. 1973 1974 The 4,300 square meters damaged by impact in February,1974 Before the flood season, the slope protection was replaced with slurry block stones.

3. 1976 Tangshan earthquake, the breakwater wall collapsed and the dam crest cracked. Grouting clay mud is used to treat cracks, and the wave wall is repaired before the flood season of 1977. On August 4. 1977, the gate of the water conveyance tunnel was stuck and the wire rope was broken. It was overhauled at that time.