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Overflow Tests Analysed by Theoretical and Numerical Methods
Author(s) -
Rushton K. R.,
Rathod K. S.
Publication year - 1980
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1980.tb03372.x
Subject(s) - drawdown (hydrology) , constant (computer programming) , mechanics , aquifer , flow (mathematics) , field (mathematics) , mathematics , geotechnical engineering , geology , computer science , physics , groundwater , pure mathematics , programming language
The assumptions inherent in the theoretical analysis of constant drawdown overflow tests are difficult to achieve in practice. This paper shows that, even if there is a restriction in the flow which causes some delay in the achievement of the constant drawdown condition, the theoretical discharge curve is followed once the constant drawdown condition is reached. Recovery tests following overflow are also examined and it is shown that the discharge used in the calculation should be the discharge at the instant that the test is stopped. Further, it is demonstrated that if well and formation losses occur, the aquifer response is distinctly different from that of the theoretical analysis. A brief description is given of an alternative method of analysis using a numerical model. A preliminary study of a field test yields promising results.