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Groundwater
1 tool in the Environmental area.
Well Hydraulics and Pumping Tests
Drawdown around pumping wells and the analysis of aquifer tests and slug tests. Prediction: the Theis drawdown with the well function W(u) (series and continued fraction), the Cooper-Jacob approximation with its validity flag, a leaky aquifer by the Hantush-Jacob function W(u, r/B) integrated numerically, an image well for a barrier or a recharge boundary, residual drawdown during recovery, the radius of influence; steady flow by the Thiem and Dupuit equations with Jacob's correction for a thin unconfined aquifer; several wells and stepped pumping rates by superposition; well loss B Q + C Q² from a step test, specific capacity and the transmissivity it implies; the capture zone of a well in uniform flow. Aquifer-test analysis from pasted data: the Cooper-Jacob straight line with an automatic choice of the late-time points, a least-squares fit of the Theis curve with 95 percent confidence intervals for transmissivity and storage coefficient, distance-drawdown and Theis recovery lines, with log-log and semi-log charts. Slug tests: hydraulic conductivity by the Hvorslev and the Bouwer and Rice methods. The default case is the three-well test of USGS Professional Paper 708 (Lohman, Table 6, well N-1): the least-squares fit gives T = 13,370 ft²/day and S = 2.0 × 10⁻⁴ against the 13,700 ft²/day and 2 × 10⁻⁴ of the handbook's graphical match.
1 worked example reproduced, listed on the tool page.