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坝体渡汛的最优方式是坝体在截流后的第1个枯期填筑到安全渡汛水位,坝体不过流,靠临时断面挡水。洪家渡面板堆石坝体采用断流围堰隧洞导流方式,围堰导流标准为枯期十年一遇洪水,而渡汛标准(库水位≥1亿m3时)为频率P=1%洪水,相应水位1021.7m高程。
The best way for crossing the dam during flood season is that the dam body is filled to the level of safety crossing flood water during the first dry season after closure of the dam, but the dam body will not flow but rely on the temporary section to block the water. Hongjiadu face rockfill dam using flow diversion cofferdam tunnel diversion method, cofferdam diversion standards for the flood season ten floods, and the transitional flood standard (reservoir water level ≥ 100000000 m3 time) for the frequency P = 1 % Flood, the corresponding water level 1021.7m elevation.