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我国幅员辽阔,汛期暴雨频繁,每年多次出现一场连续3—5天的暴雨过程;然而,稀遇性洪水——即使是局部的,也不是年年都发生的,对于一场3—5日的暴雨,有时暴雨总量很大,洪水并不稀遇;有时暴雨总量相差不大,所产生的洪水反而比较悬殊。例如“82.8”黄河三花区间暴雨总量比“58.7”多,但洪水不及“58.7”大;“74.9”与“83.7”安康以上汉江流域降雨量大体相当,而前者在安康发生的洪水仅20
China has a vast territory with heavy rains in the flood season, with a series of torrential rains lasting 3-5 days a year; however, the rarefied flood - even locally, does not occur every year. For a 3-5 Day heavy rains, and sometimes a lot of heavy rain, floods are not rare; sometimes the total amount of rain is not much difference, but the resulting flood more disproportionate. For example, the total amount of rainstorms in “82.8” Yellow River Sanhua section was more than that of “58.7”, but the flood was less than “58.7”; “74.9” and “83.7” were roughly equivalent to the rainfall in the Hanjiang River basin, while the flood in Ankang was only 20