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1981年7、8月间,长江上游、汉水流域、渭河流域等地先后发生了洪灾。长江流域的洪水即所谓“8、17”洪水,是一场大面积暴雨所形成的。这场暴雨遍布长江上游一百余县,有些县暴雨持续时间很长,三日的雨量超过200～300毫米,最高达470毫米。由暴雨而形成的巨流,在长江重庆段竟高达8.65万秒立方米,这是自清朝光绪三十一年(1905)至今的最高记录。长江上游干支流两岸的大片农田被洪水吞没(约
July and August 1981, the upper reaches of the Yangtze River, Han River basin, Weihe River Basin and other places have occurred floods. The floods in the Yangtze River valley are the so-called “8, 17” floods formed by a large area of heavy rainfall. The storm covered more than a hundred counties along the upper reaches of the Yangtze River. In some counties, the torrential rain lasted for a long time. The rainfall on the three days exceeded 200-300 millimeters and reached a maximum of 470 millimeters. The giant stream formed by the torrential rain reached as high as 86,500 m 3 in the Chongqing section of the Yangtze River, the highest recorded since the Qing Dynasty’s 31st year (1905). On the upper reaches of the Yangtze River tributaries of the vast tracts of agricultural land engulfed by the flood (about