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Time-dependent Linearized Infiltration: III. Strip and Disc Sources¹

ABSTRACT

Water flow from strip and disc surface sources is analyzed using an approach similar to previous investigations with line and point sources. A line of closely spaced trickle irrigation emitters often wets a surface strip of finite width; similarly, for a single emitter the surface wetted pattern is a disc. Lines of equal matric flux potential are wider and more shallow for these sources than wetting patterns for the line and point. The moisture regime is independent of the source shape and depends only on the total flow rate for regions beyond approximately two times the strip width or disc radius.

¹ Arizona Agric. Exp. Stn. Pap. no. 2537. Support was from Western Regional Project W-128 and funds provided by the U.S. Dep. of the Interior, Office of Water Resour. Res. as authorized under the Water Resour. Res. Act of 1964, Project B-035-ARIZ.

² Professor, Dep. of Soils, Water and Engineering, and Professor, Dep. of Mathematics, respectively, The Univ. of Arizona, Tucson, AZ 85721.

Received for publication October 15, 1975. Accepted for publication April 27, 1976.

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