水是农业的命脉,是人类生存的基本条件,更是国民经济的生命线。日益严重的水资源短缺和水环境污染不但严重困扰着国计民生,而且已经成为我国社会经济可持续发展的重要制约因素。我国是一个水资源匮乏的国家,人均水资源占有量仅为世界人均占有量的四分之一。而且在时空分布上极不均匀,开发利用上难度大,致使许多地区和城市严重缺水。重庆市虽有长江、嘉陵江和三峡库区 Water is the lifeblood of agriculture and is the basic condition for human existence. It is even the lifeline of the national economy. The increasingly serious shortage of water resources and pollution of water environment not only seriously hampers the national economy and people's livelihood, but also has become an important restrictive factor for the sustainable social and economic development of our country. Our country is a water-scarce country with a per-capita share of water a quarter of the world average. Moreover, it is extremely uneven in time and space distribution, making it difficult to exploit and exploit, resulting in severe water shortages in many areas and cities. Although Chongqing Yangtze River, Jialing River and the Three Gorges reservoir area