水作为大自然赋予人类的宝贵财富,早就被人们关注。但是,人们经常使用“水资源”一词,却是近一二十年的事。关于水资源的含义,有几十种之多,较普遍的说法是指“可以供人们经常取用、逐年可以恢复的水量”。也就是通常所指的淡水资源。这样,苦咸的海水就不算在内,连千年难化的冰川、不易取用的一部分地下水也排除在外了。水资源是人类调查了解得最清楚的资源,决不会像煤、铁、石油等资源那样有新的大发现而改变数量结构和分 Water has long been the focus of attention given to the precious wealth of mankind by nature. However, people often use the word “water”, but it is a matter of nearly two decades. The meaning of water resources, there are dozens of species, the more common argument is “can be used for people often access, year after year to restore the water ”. This is what is commonly referred to as freshwater resources. In this way, the salt water is not included, even the millennium of glaciers, difficult to access part of the groundwater is also excluded. Water resources are the clearest sources of knowledge for human investigation. They will never change their quantity and structure as new discoveries such as coal, iron, oil and other resources