Groundwater Flow from Fractured Layer to Porous-Media Blind Variable Large Diameter Well
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 4
Abstract
In this paper, unconfined porous medium is considered to drain vertically to an underlying fractured aquifer, which leads groundwater to a variable large diameter well blind to porous medium. Such cases are quite common in arid regions, where the geological layers have top to bottom sequence as quaternary sedimentary layer (porous-unconfined aquifer), weathered and/or fractured underlying layers (fractured-confined aquifer), which are underlain by impervious rock formation. The necessary type curves are provided both for the fractured (pumped) and overlying porous (unpumped) media. Initially, the effect of varying well diameter on the drawdown is explained. The general groundwater movement equation for this configuration yields to well known Theis, Hantush, and Jacob solutions. It is also indicated that at large times, classical Jacob straight line is not valid in every case, because there is a set of other straight lines with different slopes. The application of the methodology is presented for an aquifer test in the Kingdom of Saudi Arabia.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 4 • April 2008
Pages: 455 - 465
Copyright
© 2008 ASCE.
History
Received: Feb 1, 2007
Accepted: Aug 5, 2007
Published online: Apr 1, 2008
Published in print: Apr 2008
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