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一、序言随着国民经济的发展和生活水平的提高,人们对水的需求量有了显著增加。根据国土厅的预测:到21世纪初全国需水量要比1979年增加1.2倍～1.4倍,即年用水约1,080～1,260亿立方米,水资源利用率(需水量对枯水年水资源总贮量的比率)将从现在的22%增加到32%。尤其在关东和北九州地区,将分别增加到61%和54%。
I. Introduction With the development of the national economy and the improvement of living standards, people’s demand for water has significantly increased. According to the prediction of the Ministry of Land and Resources: By the beginning of the 21st century, the national water demand will have to increase 1.2 times to 1.4 times that of 1979, that is, about 180 to 126 billion cubic meters of water will be used per year. The utilization of water resources Volume ratio) will increase from the current 22% to 32%. Especially in the Kanto and Kitakyushu areas, will increase to 61% and 54% respectively.