Research Article
Sep 1967
Nonsteady-State Drainage from Porous Media
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VIEW THE REPLYAuthors: Marvin E. Jensen, M.ASCE, and R. John HanksAuthor Affiliations
Publication: Journal of the Irrigation and Drainage Division
Volume 93, Issue 3
Abstract
The validity of numerical solutions of nonsteady-state, one-dimensional, vertical drainage problems was evaluated by comparison with experimental data. Experimental data included simultaneous measurements of fluid pressure using a pressure transducer, and fluid content using gamma radiation. The results of 13 numerical solutions involving five porous media and two or three boundary conditions for each are summarized. Several approximate solutions to the vertical drainage problem were evaluated and the limitations of each discussed. The flow rate was related to the position of the saturated front during primary drainage. During secondary drainage, the change in flow rate was not dependent on the recession of the saturated zone, but was related to the unsaturated hydraulic conductivity and the differential fluid capacity above the saturated zone for the porous material and fluid involved. Characteristic changes in fluid pressure distribution with time are summarized.
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Published In
Journal of the Irrigation and Drainage Division
Volume 93 • Issue 3 • September 1967
Pages: 209 - 242
Copyright
© 1967 American Society of Civil Engineers.
History
Published in print: Sep 1967
Published online: Feb 11, 2021
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Marvin E. Jensen, M.ASCE
Research Investigations Leader, Water Management, Northwest Branch, Snake River Conservation Research Center, Kimberly (Twin Falls), Idaho
R. John Hanks
Research Investigations Leader, Moisture Conservation, Northern Plains Branch, Fort Collins, Colo
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.