Unsaturated Drainage Layers for Diversion of Infiltrating Water
Publication: Journal of Irrigation and Drainage Engineering
Volume 123, Issue 5
Abstract
An approach for draining water from unsaturated soil is presented that utilizes a sloping system of a fine sand overlying a coarser sand or gravel. In this configuration, referred to as an unsaturated drainage layer, the sand laterally drains water that accumulates above the capillary break provided by the coarse material. Drainage capacity is maximized when the sand layer has sufficient moisture to be relatively conductive, yet remains unsaturated so as to prevent failure of the capillary break. Results from field tests indicate substantial downward infiltrating water can be laterally diverted with an unsaturated drainage layer. Numerical simulations are presented that illustrate the potential effectiveness of unsaturated drainage layers to divert sufficient infiltrating water and prevent the development of positive pore water pressures.
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References
1.
Miyazaki, T.(1988). “Water flow in unsaturated soil in layered slopes.”J. Hydrol., 102, 201–214.
2.
Morris, C. E., and Stormont, J. C.(1997a). “Capillary barriers and subtitle D covers: estimating equivalency.”J. Envir. Engrg., ASCE, 123(1), 3–10.
3.
Morris, C. E., and Stormont, J. C. (1997b). “Numerical simulations of capillary barrier field tests.”Proc., 1997 Int. Containment Technol. Conf., St. Petersburg, Fla.
4.
Nyhan, J. W., Hakonson, T. E., and Drennon, B. J.(1990). “A water balance study of two landfill cover designs for semiarid regions.”J. Envir. Quality, 19(2), 281–288.
5.
Stormont, J. C. (1995). “The performance of two capillary barriers during constant infiltration.”Landfill closures, geotechnical special publication No 53, Dunn and Singh, eds., ASCE, New York, N.Y., 77–92.
6.
Stormont, J. C.(1996). “The effectiveness of two capillary barriers on a 10% grade.”Geotech. Geol. Engrg., 14, 243–267.
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Copyright © 1997 American Society of Civil Engineers.
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Published online: Sep 19, 1997
Published in print: Sep 19, 1997
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