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- W1978763296 abstract "The analysis of pump test data for strip aquifers, as for example, buried bedrock channels, can be carried out by fitting the early part of the time-drawdown curve with the Theis non-equilibrium curve or with one of Hantush's curves for leaky aquifers. The width of the strip can then be deduced from the behaviour of the later part of the time-drawdown curve. However, if the width of the strip is of the same magnitude as, or less than, the distance between pumped well and observation well, this method can no longer be applied since the boundaries cause a strong deviation from the type curves even at early times and analysis of the data by the Theis method leads to a severe underestimation of the transmissivity. However, under these conditions, groundwater flow in the aquifer approaches one-dimensional flow parallel to the strip boundaries after a short time and at a short distance from the pumped well; thus a linear flow model is more appropriate for the prediction of drawdown and the inverse problem of determining aquifer constants from the observed drawdown history. The boundary value problem for linear horizontal groundwater flow in a leaky aquifer towards a face of constant discharge has been formulated and solved leading to an expression from which transmissivity and storativity can be determined by a type-curve matching procedure similar to the Hantush and Theis methods for radial flow. Comparison of the solution with the Theis solution, modified by image well theory to account for the parallel impermeable boundaries, shows that for ratios of strip width to observation-well distance ⩽ 2 the linear model gives better estimates of the transmissivity than the radial model, and for ratios ⩽ 1 the linear model solution and the Theis image-well solution are identical for all practical purposes." @default.
- W1978763296 created "2016-06-24" @default.
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- W1978763296 date "1977-03-01" @default.
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- W1978763296 title "Type curves for analysis of pump tests in leaky strip aquifers" @default.
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- W1978763296 doi "https://doi.org/10.1016/0022-1694(77)90095-6" @default.
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