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我国幅员辽阔,水利资源丰富,平均年雨量630毫米,平均年径流量26,000多亿立方米。但是,各地区雨量差异很大,东南沿海及岛屿平均年雨量大于1,600毫米,而西北干旱区则小于200毫米。降雨的年际和季节分配不匀。多数河流,汛期暴雨强度很大,洪水迅猛。有些河流挟沙特多。这些情况给我们带来了复杂的水利和水文问题。史载,从公元前两千多年起,我国劳动人民就开始了防治水害、兴修水利的斗争。我国的
With a vast territory and rich water resources, China has an average annual rainfall of 630 millimeters and an average annual runoff of more than 2.6 trillion cubic meters. However, rainfall varies greatly across all regions, with average annual rainfall over the southeast coast and islands of over 1,600 millimeters, whereas the arid zone of northwestern China is less than 200 millimeters. Uneven distribution of annual and seasonal rains. Most rivers, flood season heavy rainfall intensity, rapid flood. Some rivers have Saudi Arabia. These conditions have brought us complex water and hydrological problems. According to the history, from over 2,000 years BC, the working people in our country started the struggle against water damage and water conservation. our country’s