Subtopic: Thermodynamic principles of I.C. engines
Question Statement:
An unsteady time-drawdown pumping test was conducted in a confined aquifer and the drawdown was measured with time in an observation well located at a certain distance away from the pumping well. Using these time-drawdown data, we can determine
Options:
(A) transmissivity only
(B) storage coefficient only
(C) specific storage only
(D) both transmissivity and storage coefficient
Official Answer Key:
D
Step-by-Step Solution & Explanation
An unsteady (transient) pumping test, unlike a steady-state (equilibrium) test, captures the time-dependent response of drawdown, which depends on both the aquifer's transmissivity (T) and its storage coefficient (S). Analysis methods for unsteady tests (e.g. the Theis type-curve method or the Cooper-Jacob straight-line method) are specifically designed to extract both T and S simultaneously from time-drawdown data at an observation well. A steady-state test, by contrast, can determine transmissivity only. Hence (D) is correct.
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