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(一)水情、雨情入夏以来黄河流域普遍乾旱,入汛后虽有两次超过四千秒公方的洪水,其特点是洪峰小而平稳。七月廿七日至八月五日潼关以下因连续降雨(如附表),形成秦厂两度高峰,是一九四九年以来最大的洪水,同时在黄河水文上陕州以下发生这样洪水还是新的问题。最初由于七日卅、卅一两日,陕州、八里胡同之间的小区暴雨,使八里胡同产生卅一日十四时四、五○○秒公方的洪峰,加上以下流域从伊(?)河、沁河的洪水,产生黄河秦厂八月一日三时五、七○○秒公方的先遣洪峰,使下游底水普遍提高。
(A) Water regime, rain conditions Since the beginning of summer, the Yellow River Basin is generally arid. Although there are floods of more than 4,000 s in the flood season after flood season, the flood peak is small and stable. July 27 to August 5 The two successive floods (as shown in the attached table) below Tongguan caused the two peaks of Qin Factory, the largest flood since 1949, and such a flood occurred below the Yellow River hydrology in Shanzhou Still new problem Originally due to heavy rains on the 7th, 8th, 8th, 8th and 8th centuries alley between Bali and Huali, the Bali Hutong produced a peak at 14.4 and 500 seconds a day and the following watersheds were flooded from Iraq ?) River, Qinhe flood, resulting in the Yellow River Qin plant August 1 at 3.5hrs, 700s advance of the public peak, so that the bottom water generally increased.