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在美国西北部,大部分田间溉溉配水系统都采用明渠,灌溉趋势是用0.42米~3/秒或更大的流量通过单个或多个分水口进行灌溉(水平畦地)。一般分水口都安装着提升闸门,人工开闭。自动灌溉可节省人力、准确地控制灌
In the northwestern United States, most open field irrigation and distribution systems use open channels. The irrigation trend is to irrigate (horizontal) with single or multiple water intakes with a flow rate of 0.42 to 3 per second or greater. General waterslides are equipped with lifting gates, manual opening and closing. Automatic irrigation can save manpower and accurately control irrigation