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一九八一年七月中旬,四川许多地区降了几天大暴雨.在川西平原、川中盆地、川北丘陵地区,即岷江、沱江、嘉陵江都发生了极大的洪水,造成了历史罕见的洪灾.暴雨延续52个小时,雨区遍及135个县,其中54个县,降雨100至400毫米.地面径流突然增加,河水陡然上涨,沿河两岸的房屋和农田多被冲毁.作者根据对四川紫色土侵蚀的研究,认为这次洪灾的形成,除了其他各方面的见解以外,从基本上提几点看法:
In mid-July 1981, a few days of heavy rains dropped in many parts of Sichuan, causing tremendous floods in the western Sichuan plain, the Central Sichuan Basin, and the hilly areas in northern Sichuan, namely the Minjiang River, Tuojiang River and Jialing River, causing a rare flood in history. Rainstorms lasted 52 hours, the rain area throughout 135 counties, of which 54 counties, rainfall 100-400 mm. Sudden increase in ground runoff, river water suddenly rose, along the banks of the houses and farmland are mostly destroyed .According to the Sichuan purple Soil erosion study, that the formation of the flood, in addition to other views, basically from the point of view: