The analytical solution of the land subsidence due to an overdraft of groundwater from a confined saturated aquifer could be deemed as approximate model , which is with two important control parameters , the diffusivity Do and the pumping coefficient No . The approximate model is applied to Pingtung County which is devided into five subsident or pumping regions : Linpien , Jiadong , Uenfeng , Shueidiliau and Fangliau .
