Composite recovery type curves in normalized time from Theis' exact solution




Type curves derived from Theis’ exact nonequilibrium well function solution are proposed for graphical estimation of aquifer hydraulic properties, transmissivity (T), and storage coefficient (S), from water‐level recovery data after cessation of a constant‐rate discharge test. Drawdown (on log scale) is plotted versus the ratio of time since pumping stopped to duration of pumping, a normalized time. Under Theis conditions, individual type curves depend on only the dimensionless pumping duration, which depends in turn on S and radial distance from the pumping well. Type curve matching, in contrast to the Theis procedure for pumping data, is performed by shifting only the drawdown axis; the time axis is fixed because it is a relative or normalized time. The match‐point for the drawdown axis is used to compute T, and S is determined from matching the curve shape, which depends on early dimensionless‐time data. Multiple well data can be plotted and matched simultaneously (a composite plot), with drawdown at different radial distances matching different curves. The ratio of dimensionless pumping durations for any two matched curves is equal to one over the squared ratio of radial distances. Application to two recovery datasets from the literature confirm the utility of these type curves in normalized time for composite estimation of T and S.

Publication type Article
Publication Subtype Journal Article
Title Composite recovery type curves in normalized time from Theis' exact solution
Series title Groundwater
DOI 10.1111/j.1745-6584.1997.tb00133.x
Volume 35
Issue 4
Year Published 1997
Language English
Publisher Wiley
Contributing office(s) Pennsylvania Water Science Center
Description 7 p.
First page 672
Last page 678
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