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由于新设计规范对于土坝防洪标准的规定有所变化，百丈氵示大坝正常运用防洪标准由１００年降至５０年，而非常标准由５００年提高到２０００年一遇。为此需对坝体进行加高，并结合对原顶部质量差的心墙进行改造。为减少工程量，改进了防浪墙的迎水面形状，以减少波浪爬高，同
As the new design code has changed the standards of earth dam flood control, Baizhang shows dam normal flood control standards dropped from 100 to 50 years, while the very standard increased from 500 to 2000. To do this, it is necessary to heighten the dam body and combine it with the original poor quality heart wall. In order to reduce the volume of works, the surfacing shape of the wave-preventing wall is improved to reduce the wave climbing height