HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Rubin, J. Articles by Steinhardt, R. Search for Related Content PubMed Articles by Rubin, J. Articles by Steinhardt, R. Agricola Articles by Rubin, J. Articles by Steinhardt, R.

Soil Water Relations During Rain Infiltration: III. Water Uptake at Incipient Ponding¹

ABSTRACT

Rain-induced ponding onset was analyzed theoretically, by using a diffusion-type equation of soil moisture flow and was investigated experimentally, by employing laboratory columns of a sandy soil. Equations for the lower and upper bounds of water uptakes at incipient ponding were derived. These expressions seemed to represent well the experimentally established relation between rain intensity R and cumulative rain uptake by a soil on the surface of which isolated puddles just started to form. In every case observed, such an uptake was significantly smaller than one of a flood-wetted column which reached an infiltration rate equal to R. On the other hand, at identical water entry fluxes, similar uptakes were exhibited by flooded columns and rain-wetted soil which had just become completely covered by a mantle of ponded rain-water.

¹ Joint contribution from the Water Resources Division, U. S. Geological Survey, Menlo Park, Calif., and the Division of Soils and Water, National and University Institute of Agriculture, Rehovot, Israel. Publication authorized by the Director, U. S. Geological Survey.

² Research Soil Physicist, U. S. Geol. Survey and Assistant Soil Physicist, N.U.I.A., respectively.

Received for publication March 9, 1964. Accepted for publication June 11, 1964.