Research Article
Dec 1969
Infiltration of Water into Nonuniform Soil
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VIEW THE REPLYPublication: Journal of the Irrigation and Drainage Division
Volume 95, Issue 4
Abstract
A simplified procedure for calculating infiltration into soil of nonuniform water content or hydraulic conductivity, or both, is presented. The procedure is based on the Green and Ampt model of piston flow. Input data consist of the difference in water content before and after wetting, the hydraulic conductivity after wetting, and the water entry value of the soil. Techniques for measuring these parameters in the field are briefly described. The procedure is applied to calculate infiltration-time relationships for flood irrigation of a coarse-textured and a fine-textured soil, and to evaluate the effect of nonuniform inundation time on irrigation efficiency. The results show that the usual recommendation of allowing an inundation-time difference of not more than 25% of the time required for the desired amount of water to infiltrate into soil can give irrigation efficiencies of 90% or more. Thus, larger differences in inundation time can be allowed in practice, particularly if the hydraulic conductivity of the soil decreases with depth.
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Published In
Journal of the Irrigation and Drainage Division
Volume 95 • Issue 4 • December 1969
Pages: 451 - 462
Copyright
© 1969 American Society of Civil Engineers.
History
Published in print: Dec 1969
Published online: Feb 11, 2021
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Authors
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Herman Bouwer, M.ASCE
Chief Hyd. Engr., U.S. Water Conservation Lab., Soil and Water Conservation Research Division, Agricultural Research Service, U.S. Dept. of Agriculture, Phoenix, Ariz
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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.
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.