Abstract
Discharge tests are conducted in order to determine aquifers transmissivity (T) and storage coefficient (S). However the interpretation of test data is not unique and the results may vary depending on adopted hypothesis. In this work, the convolution technique is applied for the reconstruction of observed drawdown curves aiming for the reduction of uncertainty. The interference between a flowing well and an observation well is evaluated in order to determine the hydrogeological parameters of the confined Guarani Aquifer System (Araujo et al. 1999). Discharge test data are analyzed according to the Jacob and Lohman (1952) method. The application of convolution enabled the determination of the most reliable solution. Obtained transmissivity (T = 411.0 m2/d) and storage coefficient (S = 2.75x10–4) are close to values estimated by direct evaluation of the geotechnical sandstone properties.
Highlights
The determination of aquifers transmissivity (T) and storage coefficient (S) is based on the observation of aquifer’s response to a given stimulation
The interference between a 1244 m deep flowing well and an observation well is evaluated in order to determine the hydrogeological parameters of the confined Guarani Aquifer System
Discharge test data were analyzed according to the Jacob and Lohman method in order to determine the hydrogeological parameters of the confined Guarani Aquifer System
Summary
The determination of aquifers transmissivity (T) and storage coefficient (S) is based on the observation of aquifer’s response to a given stimulation. The interpretation of discharge tests data relies on the physical conditions of the aquifer (e.g. unconfined, confined, leaky, homogeneous, isotropic), the drawdown regime (steady or transient), pumping condition (constant or variable discharge), the hydraulic boundaries, and the well construction (fully or partially penetrating). In this sense, many authors (overview given by Freeze and Cherry 1979) have provided mathematical approaches for data analyses according to the different pumping conditions. Do not need pumping energy, and water from the aquifer flows naturally at the well head The analysis of this problem was described originally by Jacob and Lohman (1952)
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