中国水利(English).ppt
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1、 A long history of dealing with waterA long history of dealing with water resources in China.resources in China.The The DujiangDujiang Weir,the famous ancient Weir,the famous ancient water resources water resources project in China,constructed project in China,constructed in 256 B.C.in 256 B.C.w 85,
2、000 reservoirs85,000 reservoirsw w 260,000 km dikes 260,000 km dikesw w 57 million hectare coverage of irrigation 57 million hectare coverage of irrigation w w 670 thousand km 670 thousand km2 2 of soil erosion harnessed.of soil erosion harnessed.w w The capacity of water electricity,28.8 million Th
3、e capacity of water electricity,28.8 million kwkw w w 6%renewable water resources and 9%plow land in 6%renewable water resources and 9%plow land in the world supporting 22%the worlds population the world supporting 22%the worlds population Main achievements:w Frequent water disasters&poor protectionw Shortage of water resourcesw Exacerbation of water environment Main problems:There are more than 86,000 dams in China,the largest number in the world,including over 70 dams higher than 100 meters.Dams
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