Research Article
Jun 1980
Drain Depth and Subirrigation in Layered Soils
Authors: Yau K. Tang and R. Wayne SkaggsAuthor Affiliations
Publication: Journal of the Irrigation and Drainage Division
Volume 106, Issue 2
Abstract
The Richards equation for two-dimensional saturated—unsaturated water movement was solved for subirrigation from buried drains in layered soils. Numerical solutions were obtained for soils that have subsurface layers with high hydraulic conductivities. Results showed that increasing the drain depth so that it approaches or penetrates a high conductivity bottom layer will reduce head loss due to convergence near the drain. Deeper drains significantly increased subirrigation rates for deep soils and narrow drain spacings but had a smaller effect for shallow profiles and wide spacings. The response to deeper drains also increased with hydraulic conductivity and thickness of the bottom layer. The results showed that the drain should be placed at the interface of the high conductivity layer when possible. Further increases in the depth of the drain did not result in significant increases in subirrigation rate or water table rise.
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Published In
Journal of the Irrigation and Drainage Division
Volume 106 • Issue 2 • June 1980
Pages: 113 - 122
Copyright
© 1980 American Society of Civil Engineers.
History
Published in print: Jun 1980
Published online: Feb 11, 2021
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Authors
Affiliations
Yau K. Tang
Research Assoc., Dept. of Biological and Agricultural Engrg., North Carolina State Univ., Raleigh, N.C.
R. Wayne Skaggs
Prof., Dept. of Biological and Agricultural Engrg., North Carolina State Univ., Raleigh, N.C.
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