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Derivative plots are a useful diagnostic tool for examining the effects of wellbore storage, recharge and barrier boundaries, leakage, delayed gravity response and fracture flow.
The Theis (1935) solution for a pumping test in a confined aquifer assumes no wellbore storage.
The Papadopulos-Cooper (1967) solution for a pumping test in a confined aquifer includes wellbore storage.
The Neuman (1974) solution for a pumping test in an unconfined aquifer includes delayed gravity response but assumes no wellbore storage.
The Moench (1997) solution for a pumping test in a unconfined aquifer includes delayed gravity response and wellbore storage.
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