Comparison of Models for Subsurface Drainage in Flat and Sloping Lands
Publication: Journal of Irrigation and Drainage Engineering
Volume 120, Issue 2
Abstract
Most models for subsurface drainage in flat lands are based on the Boussinesq equation. This paper compares a semianalytical model called SIDRA, which assumes a constant water‐table shape during the period of water table recession, to a model called SLOP, which is based on a numerical solution to the Boussinesq equation. Solutions were obtained for both steady‐state and transient drainage events on flat lands and for drainage under steady‐state recharge on sloping lands. The two models were in excellent agreement for steady‐state and transient drainage on flat lands. Differences in the shape factors calculated from the two models were always less than 4%. The implicit solutions in SIDRA were also in good agreement with SLOP for sloping lands. The numerical solutions in SLOP were reliable for low slopes but were unstable for conditions in which the streamlines cannot be considered horizontal.
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Information & Authors
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Published In
Journal of Irrigation and Drainage Engineering
Volume 120 • Issue 2 • March 1994
Pages: 266 - 277
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Nov 9, 1992
Published online: Mar 1, 1994
Published in print: Mar 1994
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