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1990年7月5日至6日,汉中地区西部的略阳、宁强、勉县及宝鸡市的凤县等地普降了特大暴雨,引起山洪暴发,汉江流域内大小河流洪水猛涨,7月6日平川段出现了继“81·8”洪水之后的又一次特大洪水(称“90·7”洪水)。勉县段和汉(中)南(郑)段的洪峰流量均超过了“81·8”洪水,上游的宁强大安和勉县境内的支流堰河洪水为百年不遇,褒河、沮水、玉带河等较大支流洪水也都远远超过警戒流量。由于这次汉江洪水,平川段堤防出现决口16处(长1923m),堤岸滑塌和基础悬空55处(长28732m),67座护基坝和闸涵等建筑物不同程度地毁坏,冲毁万亩以上灌区的干渠5km 多,造成14多万亩水田当
From July 5 to July 6, 1990, torrential rains were caused by heavy rainfall in Lueyang, Ningqiang, Mianxian and Fengxian districts of western Hanzhong, causing flash floods and floods of rivers and streams in the Hanjiang River valley. 7 On June 6, another huge flood (called “90.7” flood) occurred following the “81.8” flood in Hirakawa section. Mianxian section and Han (middle) South (Zheng) section of the flood peak flow exceeded the “81.8” floods, the upstream Ningqiang Da’an and Mianxian tributary weir river flood in a hundred years, Baohe, Zushui, jade belt Rivers and other larger tributaries of floods are far more than the alert traffic. As a result of the Han River flood, there were 16 breakdowns (1923m in length) at the embankment of Pingchuan section, 55 sluices and 55 dikes (length of 28732m), 67 buildings such as base guard dam and gate culvert were damaged to varying extents, More than 5 mu of irrigated area of the main canal, resulting in more than 140,000 mu of paddy field when