NC Division of Water Resources

Reverse-Time Drawdown Analysis

Calculate drawdown at a well over time using known transmissivity and storage coefficient values. Method can be used with transient flow conditions (Cooper-Jacob straight-line time-drawdown).

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ParametersValues
Transmissivity (square feet/day)
Storage Coefficient (dimensionless)
Pumping Rate (gallons per minute)
Length of Test (minutes)

There are 1,440 minutes per day

Distance from Pumping Well (feet)