Abstract
ABSTRACT The hydraulic conductivity of aquitard is difficult to assess, yet its accurate determination is critical to understanding the hydraulic connections of a multi-layered aquifer system. A new method called the single-well water injection test is proposed for estimating the hydraulic conductivity of an aquitard in a multi-layered aquifer system. Considering the influence of the overlying and the underlying aquifers, the stable well flow formula was deduced according to the water injection test using a mirror-image method. Also, the method was applied in a field test in Nantong City, China. The calculated hydraulic conductivity of the aquitard was consistent with results of the laboratory and field tests, which illustrates the correctness and engineering applicability of the proposed method. The proposed method is simple and easy to implement, and field examples demonstrate the potential applications of the proposed method in determining the hydraulic conductivity of aquitards.
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