較深的含水层做抽水試驗时,由于設备条件限制,无法在主孔边安置測压管(旁边打观測孔又太浪費),这就只能观测孔內之水位,因此就产生了“主孔內动水位与主孔外动水位究竟相关多少?”这个問題。根据我的体会主孔內动水位較孔壁外动水位低的原因有兩个,一是孔外之水流經过濾器时所产生之能量損失,設为h_1,二是水在孔內流动时所产生之能量損失,設为h_2。二者之和即得孔內动水位低于孔外水位之高度,在深孔中可能h_1退居于次要位置,同时 Deep aquifers do pumping tests, due to equipment limitations, can not be placed in the main hole side of the piezometer tube (next to the observation hole is too wasteful), which can only observe the hole in the water level, it has produced “The main hole moving water level and the main hole outside the water level how much?” This problem. According to my experience, there are two reasons why the water level in the main hole is lower than the water level outside the hole wall. First, the energy loss caused when the water outside the hole flows through the filter is set as h_1. Second, when water flows in the hole The resulting energy loss, set to h_2. The sum of the two is that the water level in the hole is lower than the height of the water level outside the hole, h_1 may be relegated to a secondary position in the deep hole, meanwhile