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1956年8月上旬，受蒙古低压与西南腹径流共同作用影响，拉林河普降暴雨，干流沈家营、五常、蔡家沟站出现了历史第四、第二、第三位大洪水．
In early August 1956, due to the combined action of low pressure in Mongolia and southwestern beltway, there were heavy rains in the Lalin River and the fourth, second and third major floods in Shenjiaying, Wuchang and Caijiagou stations in the mainstream.