THE CONTROL OF PUMPING RATE BY RECIRCULATION FOR THE PUMPING TEST

摘要

A circulation-type control method for an underground water pumping test is provided to control the amount of pumping underground water within a wide amount range by controlling the amount of returning water. A return tube(51) is connected to an underground water pumping tube, so that a part of lifted underground water returns to a pumping water tank(10) in a process of pumping underground water. Lifted underground water flow(40) is divided into returning underground water flow(50) and outgoing underground water flow(60) by the return tube connected to the underground water pumping tube. Even though a required amount of underground water is changed, the amount of underground water being lifted by a water pump(30) is maintained.