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Interpretation of Boundary Effects From Pumping Test Data
The hydraulic characteristics of an aquifer that define its abilities to store and transmit water are generally determined from the analysis of pumping test data by means of various formulas, of which the most widely used is the nonequilibrium formula developed by Theis. The development of the formula was based, in part, on assumptions that the aquifer pumped is of infinite areal extent and of uniform permeability. Stallman presented a modification of the Theis formula to extend its application to situations in which the pumped formation is adjacent to another formation of a vastly different transmissibility and the boundary between the formations approximates a straight line. Stallman's modification and the analytical procedures described by Brown for analyzing data from aquifer tests involving boundaries are based on the image well theory, according to which the hydraulic effects actually caused by the geologic boundaries may be theoretically ascribed to strategically placed imaginary wells. The application of the image well model makes it possible to treat a problem involving boundary conditions like one of a multiple‐well system in an infinite aquifer. Methods and procedures outlined by Stallman and Brown make possible the solution of problems involving one boundary; the hydraulic system may be balanced by the proper positioning of one image well. The resultant drawdown patterns have been described by Lang. The article presents the Theis nonequilibrium formula, along with a hypothetical example.
Interpretation of Boundary Effects From Pumping Test Data
The hydraulic characteristics of an aquifer that define its abilities to store and transmit water are generally determined from the analysis of pumping test data by means of various formulas, of which the most widely used is the nonequilibrium formula developed by Theis. The development of the formula was based, in part, on assumptions that the aquifer pumped is of infinite areal extent and of uniform permeability. Stallman presented a modification of the Theis formula to extend its application to situations in which the pumped formation is adjacent to another formation of a vastly different transmissibility and the boundary between the formations approximates a straight line. Stallman's modification and the analytical procedures described by Brown for analyzing data from aquifer tests involving boundaries are based on the image well theory, according to which the hydraulic effects actually caused by the geologic boundaries may be theoretically ascribed to strategically placed imaginary wells. The application of the image well model makes it possible to treat a problem involving boundary conditions like one of a multiple‐well system in an infinite aquifer. Methods and procedures outlined by Stallman and Brown make possible the solution of problems involving one boundary; the hydraulic system may be balanced by the proper positioning of one image well. The resultant drawdown patterns have been described by Lang. The article presents the Theis nonequilibrium formula, along with a hypothetical example.
Interpretation of Boundary Effects From Pumping Test Data
Lang, S. M. (Autor:in)
Journal ‐ American Water Works Association ; 52 ; 356-364
01.03.1960
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Pumping , Permeability , Hydraulics , Aquifer
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