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Although with 2.8 trillion cubic meters total water resources and more than 10 million cubic meters ground water,China is a country with limited water resources in terms of per capita.Due to the large population,the per capita water resources in China stands at 2220 cubic meters,only one forth of the world average.The alloca- tion is also uneven among different years and regions.The precipitation concentrates in summer and autumn and in eastern and southern parts of the country.With about 60 percent of the total land area,the north- ern parts of China have only 20 percent of
Although with 2.8 trillion cubic meters total water resources and more than 10 million cubic meters ground water, China is a country with limited water resources in terms of per capita. Due to the large population, the per capita water resources in China stands at 2220 cubic meters, only one forth of the world average. The alloca- tion is also in the different years and regions. The precipitation concentrates in summer and autumn and in the eastern and southern parts of the country. How about 60 percent of the total land area, the north-ern parts of China have only 20 percent of