Method to Estimate Water Storage Capacity of Capillary Barriers
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 124, Issue 4
Abstract
This paper presents a method to estimate the additional storage capacity derived from the presence of a capillary break or barrier beneath a soil layer used in a surface cover system. The method involves first estimating the suction head profile in the soil layer at breakthrough. Then, using a relationship between suction head and water content (i.e., the moisture characteristic function), the corresponding water content profile is derived. Integrating the water content over the depth of the soil layer yields the total water in the layer from which the net storage capacity can be determined. Good agreement was obtained between the water storage capacity calculated using this method to those derived from numerical simulations. Example calculations illustrate the influence of the overlying soil texture, thickness, and the water entry head of the coarse layer on the storage capacity of a capillary barrier system. The paper also discusses how the moisture characteristic curve provides insight into the expected storage capacity for a soil in a capillary barrier configuration.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 124 • Issue 4 • April 1998
Pages: 297 - 302
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Apr 1, 1998
Published in print: Apr 1998
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