水资源是一种动态性资源,包括地表水、土壤水和地下水,其补给来源主要靠降水。我国多年平均降水总量为61900亿m~3,全国河川每年平均径流总量为27100亿m~3,其中包括地下水补给量约6780m~3,冰川融雪补给量560亿m~3,每年流入海洋和流出境外的水量为2456亿m~3,地下水天然资源量多年平均约为8300亿m~3。我国水资源总量为28100亿m~3,占世界 Water resources are a kind of dynamic resources, including surface water, soil water and groundwater. Their sources of recharge are mainly precipitation. The average annual precipitation in China is 6,190 billion m ~ 3. The average annual runoff of rivers in the whole country is 2,710 billion m ~ 3, including 6780 m ~ 3 groundwater recharge and 56 billion m ~ And the amount of water flowing out of the country is 245.6 billion m 3. The average annual groundwater natural resources is about 830 billion m 3. China’s total water resources is 28100 billion m ~ 3, accounting for the world