Because most wells are used for agricultural irrigation, most of them are wasteland, so even if they appear, it is normal.
There are two kinds of construction methods for large-mouth wells: one is large grooving method, manual excavation or blasting construction; The second is open caisson method, drainage construction or undrained construction. In the reverse pumping construction, two methods, mechanical hanging hammer and manual hanging hammer, are generally adopted, and the suction pipe is directly driven into the ground by the gravity of the hanging hammer.