Maximization of Water Storage in Backfilled and Lined Channels and Dimples Subject to Evaporation and Leakage
Publication: Journal of Irrigation and Drainage Engineering
Volume 134, Issue 1
Abstract
A channel or axisymmetric dimple filled with a coarse porous material and aimed at a temporary storage of infiltrated water as a perched water table aquifer is studied. The bottom shape is varied based on the criterion of maximal water storage after a certain period of drainage and evaporation. Leakage into the vadose zone through a thin liner occurs with a specific discharge proportional to the pressure drop across the liner. Evaporation through a horizontal shrinking water table is spatially uniform. An ordinary differential equation, which follows from the mass balance condition, is solved either explicitly or numerically. The class of triangular, polynomial, and conical sections is studied. The shape of maximal water retention is calculated for a given initial stored water volume or water table width, evaporation intensity, liner thickness and conductivity, vadose zone pressure beneath the liner, and selected time interval between two sequential infiltration events.
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Acknowledgments
Helpful comments and criticism by three anonymous referees are highly appreciated.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 134 • Issue 1 • February 2008
Pages: 101 - 106
Copyright
© 2008 ASCE.
History
Received: Sep 6, 2006
Accepted: May 23, 2007
Published online: Feb 1, 2008
Published in print: Feb 2008
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