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全世界可利用的淡水资源(不包括洪水)约14亿立方米,仅占全球总水量的万分之一左右。而这些淡水在地球上的时空分布很不平衡,同时随着世界人口的增加和工农业生产的发展,淡水资源的供需矛盾日益激化,因此节约用水迫在眉睫。农业是最大用水户,全世界灌溉用水量约占总用水量的70％,预计本世纪末全球灌溉用水量将增加25—30％。
About 1.4 billion cubic meters of freshwater resources (excluding floods) are available worldwide, accounting for only about one ten thousandth of the world’s total. However, the spatial and temporal distribution of freshwater on the earth is very uneven. At the same time, with the increase of world population and the development of industry and agriculture, the contradiction between supply and demand of freshwater resources is intensifying day by day. Therefore, water conservation is imminent. Agriculture is the largest user of water. The world’s irrigation water accounts for about 70% of the total water consumption. It is estimated that global irrigation water consumption will increase by 25-30% by the end of this century.