Millions of irrigation wells in many countries are now pumping water out of underground sources faster than rainfall can refill them.
在许多国家，数以百万计的灌溉井现在从地下水源抽水的速度，超过了降雨所能再次填满的速度。
Irrigation: No untreated sewage water may be used for irrigation. Irrigation methods should take into consideration sustainability of the water sources and the quality of the water.
灌溉：任何没有经过处理的污水沟都不能用于灌溉。使用的灌溉方法要考虑到水资源的可持续性和水的质量。
Irrigation methods should take into consideration sustainability of the water sources and the quality of the water.
使用的灌溉方法要考虑到水资源的可持续性和水的质量。
Good quality of the water sources is essential to WS, especially, the sprinkler irrigation and micro-irrigation. It is required that the irrigation water contains no or little sediment.
节水灌溉对水源水质要求很高，尤其是喷灌、滴灌要求水流不含沙或含沙量很小。
Good quality of the water sources is essential to WS, especially, the sprinkler irrigation and micro-irrigation. It is required that the irrigation water contains no or little sediment.
节水灌溉对水源水质要求很高，尤其是喷灌、滴灌要求水流不含沙或含沙量很小。
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