Type Curves for a Slug Test in an Infinitely or Semi-infinitely Thick Aquiferby Gary R. Chirlin, Chirlin & Associates Inc, Rockville, United States,
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Abstract: Type curves are provided for a slug test in an infinitely or semi-infinitely thick aquifer, the latter with the single confining layer immediately above or immediately below the well. The two controlling parameters are normalized specific storage α (=SsLrs2/rc2) and normalized screen length γ (=L/rs). Type curves are given for discrete values of α between 10-1 and 10-7, and for γ between 12 and 240 (6 and 120 for the semi-infinite setting). The Cooper et al. (1967) method is designed for a confined aquifer with fully penetrating well. For a setting with a partially penetrating well in a confined aquifer, use of both the Cooper et al. and the present method bounds an estimate of K when α is known. If an aquifer is effectively infinitely or semi-infinitely thick (one or both confining layers are too remote to effect the slug test), then use of the Cooper et al. method leads to overestimation of hydraulic conductivity. For the domain of α and γ explored in this study, the factor of estimation error ranges from 1.00 (negligible error) to 3.81. Error increases with decreasing α and γ.
Subject Headings: Aquifers | Pumping tests | Curvature | Wells (water) | Fluid dynamics | Model tests | Hydraulic conductivity | Errors (statistics)
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