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Abstract

Transmissivity is a crucial hydrogeological parameter for evaluating groundwater resources. This parameter is conventionally evaluated using pumping tests; however, these tests are costly and can be conducted at few sites. Many researchers have used ground resistance and pumping test data to estimate various hydrogeological parameters. In this study, borehole resistance survey and pumping test data collected by the Taiwan Groundwater Monitoring Network were used to establish the relationship between transmissivity and formation factor for aquifers in the Zhuoshui River alluvial fan. This relationship was then used to estimate the water output of the aforementioned aquifers in a cost-effective manner from the formation factor estimated through borehole resistance surveys. The results indicated that the shallower aquifer in the aforementioned alluvial fan exhibited its highest transmissivity in the top-fan area, whereas the deeper aquifer exhibited its higher and lower transmissivity in the northern and southern regions of the alluvial fan, respectively. These lower transmissivity distributions may be attributable to local land subsidence. Throughout the entire Zhuoshui River alluvial fan, the transmissivity and formation factor of aquifers at different depths could be favorably modeled by an exponential relationship. Furthermore, this relationship could be simplified into a linear relationship with a high coefficient of determination (0.84). The strong correlation between the transmissivity and the formation factor suggests that the proposed method is effective for reducing the cost of groundwater resource evaluation.

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