由於受壓飽和含水層長期超抽地下水,因而導致嚴重的地層下陷。故於沉陷區域設置多口觀測井,用於取得沉陷檢測與地下水位等兩項資料,以便瞭解沉陷區域之地層變化及控制該區域之抽水。除此用途外,本研究探討這兩項資料只需再配合水井普查之其他用途,既可間接地獲知受壓飽和含水層滲透係數K與壓縮指標Cc之歷年變化。 The continual overdraft of the groundwater from a confined saturated acquifer will result in a severe land subsidence. Therefore, in a land subsidence field several observation wells were sunk to obtain two items of the continuous data, the land settlement and the groundwater level, in order to understand the variation of the ground level and to control the pumping of the groundwater. In addition to these purposes, this paper investigates the other purposes for utilizing of the above two mentioned field data in coorporation with a field survey of well, i.e., the indirect determination of the annual variations of the permeability K and compression index Cc of the stratum.