我国幅员辽阔,气候复杂,水旱灾害频繁。就全国范围讲,这里不旱那里旱,这里不涝那里涝,水旱灾害年年有;就某一地区而言,不是旱就是涝,风调雨顺的年份不多,而且常有先旱后涝的情况。仅据解放后有统计资料的36年计算,全国水旱灾害受灾面积平均每年41092万亩,其中水灾11422万亩,旱灾29670万亩,成灾面积平均每年17946万亩,其中水灾6747 Our country has a vast territory, a complex climate, frequent floods and droughts. As far as the whole country is concerned, there is no drought here, where waterlogging is not a problem, floods and droughts occur year after year. In a certain area, drought is not a waterlogging season, and there are not many years of good weather, Happening. According to the statistics of 36 years since the liberation, the average area affected by floods and droughts averages 410.92 million mu, including 114.22 million mu of floods and 296.7 million mu of drought and an average of 179.46 million mu of disaster-stricken areas each year, of which floods are 6747