一、北方缺水形势日趋严峻,南水北调走中线势在必行我国水土资源分布极不均衡,长江流域及其以南河川径流量占全国的80％以上,耕地不到全国的4O％;黄淮海流域的河川径流不到全国的 First, the situation of water shortage in the north is becoming more and more serious. It is imperative to move the water diversion southward into the middle line. The distribution of water and soil resources in China is extremely uneven. The runoff in the Yangtze River and its south reaches accounts for more than 80% of the country’s arable land, less than 40% of the country’s arable land. River basin runoff less than the country