the drip irrigation hair canal滴灌毛管
Dujiangyan Irrigation System Canal Head都江堰灌区渠首
Subei General Irrigation Canal苏北灌溉总渠
main irrigation canal灌溉干渠
Jianan Irrigation Canal嘉南大圳
Irrigation canal distribution渠系分布
an irrigation canal system灌溉渠系
irrigation canal infiltration渠道渗漏补给量
baiqu irrigation canal白渠