Due to no direct irrigation cost in Self-flowing irrigation Zone along Yellow River, the efficiency of water use is also lowest.

沿黄自流灌区由于没有直接灌溉成本，其用水效率也是最低的。

youdao

Finding a Mediterranean climate characterised by warm, dry summers and cool, wet winters, they successfully planted their own vines and have kept the valley dry grown (ie no irrigation zone) for more than 150 years.

BBC: Beyond the vines in Australia��s Barossa Valley

This type of zone irrigation means less water is wasted on plants that don't really need it.

CNN: X-rated yards save the environment