Transient Radius of Influence Model
Publication: Journal of Irrigation and Drainage Engineering
Volume 120, Issue 5
Abstract
In the traditional analysis, the radius is defined as a constant radial distance beyond which the aquifer is undisturbed by the pumping of water from a well. In the real world, the radius is a transient variable. Its value is zero when the pumping starts, and it expands radially in the aquifer as pumping proceeds. A transient radius of influence is a proper concept to describe well hydraulics. Traditional analyses in well hydraulics were focused on water table drawdown, and less attention was given to the cone of depression volume. From the conservation of mass principle, the cone of depression volume is related to the amount of water removed from the aquifer and is, therefore, related to the pumping time. Such an concept is employed to obtain transient solutions of well drawdown and radius of influence for a well in an unconfined aquifer under a constant recharge rate.
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References
1.
Boulton, N. S. (1954). “The drawdown of water table under non‐steady conditions near a pumped well in an unconfined formation. Proceedings of the Institution of Civil Engineers, (London), 3(3), 564–579.
2.
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Koch, N. C. (1982). A digital‐computer model of the Big Sioux Aquifer in Minnehaha County, South Dakota, U.S. Geological Survey, Washington, D.C.
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Copyright © 1994 American Society of Civil Engineers.
History
Received: Sep 20, 1993
Published online: Sep 1, 1994
Published in print: Sep 1994
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