我国北方各省、市、自治区蕴藏着十分丰富的地下水。据有关方面的初步调查,可供开采的地下水年平均流量约为7000亿立方米左右。这一年平均流量若全部开采,相当于我国北方地区增加了17条黄河的年平均流量。这样势必极大地改变北方干旱、半干旱 China’s northern provinces, municipalities and autonomous regions contain a very rich groundwater. According to preliminary investigations conducted by relevant authorities, the average annual groundwater flow available for exploitation is about 700 billion cubic meters. If this year’s average flow rate is fully exploited, it will be equivalent to an increase of 17 annual average flows of the Yellow River in the northern part of our country. This is bound to greatly change the arid and semi-arid north