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近十多年来,美国每年因水土流失损失约40亿美元,洪水夺走100余人的生命.印度于1978—1979年连续发生水灾,损失约13亿美元,有1.7万多人、42万余头牛丧失了生命.孟加拉国的孟克拉水库,蓄水量约72.6亿立方米,现每年淤积量为1亿吨左右.厄瓜多尔的波萨磅达河发生泛滥,造成71个水库被沙石所掩埋.印度的17个主要水库,原设计每年每平方公里淤积量为293立方米,实际则为917立方米.上游水源林遭受破坏是造成洪灾的重要原
In the past decade or so, the United States has lost about 4 billion U.S. dollars of soil and water loss each year and the floods claimed more than 100 lives. In 1978 and 1979, India suffered a series of floods with losses of about 1.3 billion U.S. dollars, more than 17,000 people and more than 420,000 Head of cattle lost their lives Bangladesh’s Bangladesh Kela Reservoir, about 7.26 billion cubic meters of water storage, siltation is about 100 million tons per year Ecuador’s Po Sok Pundal flooding, resulting in 71 reservoirs were sand and gravel Buried. India’s 17 major reservoirs, the original design per sq km of siltation of 293 cubic meters per year, the actual is 917 cubic meters. The upstream water source forest damage is caused by floods important