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一、西北地区的水资源短缺问题我国西北地区多年平均降雨量235mm ,年均降水总量为6965 3亿m3,占全国的11 7%。地表水和地下水分别为1874 5亿m3/年和1146 0亿m3/年 ,扣除重复计算量后的水资源总量为1979 3亿m3/年 ,占全国的7 0 % ,是西南
First, water shortage in Northwest China The average annual rainfall of 235mm in Northwest China, the average annual rainfall of 696500000000 m3, accounting for 11.7% of the country. Surface water and groundwater were 1874.5 billion m3 / year and 1146.0 billion m3 / year, respectively. The total amount of water resources after deduction of calculation was 1979.3 billion m3 / year, accounting for 70% of the national total