从全球看,水的开发与利用和水资源严重缺乏的矛盾已日益突出。在我国600多座城市中,有300多个城市缺水,108座城市严重缺水,日均缺水1600万m3,到2000年这些城市年缺水将达200亿m3,每年因缺水损失的工业产值上千亿元,水已成为制约我国社会和经济发展的主要因素之一,节约用水应是防止水资源危机,解决供需矛盾的长期的必要的方针。 Globally, the contradiction between the development and utilization of water resources and the serious lack of water resources has become increasingly prominent. In more than 600 cities in China, more than 300 cities are short of water and 108 cities are severely water-scarce with an average daily water shortage of 16 million m3. By 2000, the annual water shortage in these cities will reach 20 billion m3, causing an annual water loss Of the industrial output value of hundreds of billions of yuan, water has become one of the main constraints on China’s social and economic development, water conservation should be to prevent the crisis of water resources, to solve the contradiction between supply and demand long-term necessary principle.