自流灌溉在平原和陂泽地区较易办到,在丘陵山坡地就需要有高效率的提水工具。魏晋南北朝时,地主庄园迅速发展,占山护泽的多了起来,耕地逐步从平原推进到丘陵山地。这种趋势发展到唐朝开元,天宝年间达到高峰,“虽高山绝壑,耒耜亦满”(元结:《问进士》)。灌溉工具的需要比过去迫切多了,因此在唐代关于水车的资料多了起来。《太平广记》卷250引《启颜录》云: Runoff irrigation in the plains and the Sawa area easier to do, in hilly slopes need to have efficient water lifting tools. During the Wei, Jin and Southern and Northern Dynasties, the landowners’ estate developed rapidly, taking up more of the mountains and protecting farmland. The cultivated land gradually advanced from the plain to the hills and mountains. This trend developed to the Kaiyuan New Tang Dynasty, Tianbao peaked during the Tang Dynasty, “Although the mountains are absolutely grateful, full of ” (yuan knot: “asked Scholars”). The need for irrigation tools is more pressing than in the past, so there is more information about water tankers in the Tang Dynasty. “Taiping Guangji” Volume 250 cited “Kai Yan recorded” cloud: