[Question] In foundation pit dewatering, what is a foundation pit dewatering funnel?

　　[Answer] For example, when a well is drilled and water is pumped from it, as pumping proceeds, a funnel-shaped dewatered zone with lowered water level forms around the well, centered on the well. If the scope of the well is expanded into a foundation pit, then as dewatering of the pit proceeds, a funnel-shaped dewatered zone will also form around it.