1931年，长江、淮河发生了全流域的特大洪水，为数百年间所罕见。洪涛肆虐，许多沿江滨河城镇陆沉，大片农田化作汪洋，成千上万人遭灭顶之灾，成百万灾民流离失所。江淮洪水何处来当年，长江、淮河流域发生了长历时、大强度的暴雨，梅雨大雨带长期停滞在江淮流域，月降水量比? In 1931, the Yangtze River and the Huaihe River experienced grand floods in the whole basin, which were rare for hundreds of years. Hong Tao wreaks havoc and many coastal rivers and lakes settle into rivers and lakes, vast areas of farmland are turned into vast oceans, tens of thousands of people are drowned and millions of displaced people are displaced. Where did the floods of the Yangtze River and the Huai River come from, the long-time and heavy rainfall occurred in the Yangtze River and Huaihe River valleys, and the heavy rainfall zone of the Meiyu rainstorm lasted for a long time in the Yangtze-Huaihe River Valley.