SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 20:412-415 (1956)
© 1956 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Predicting Moisture in the Surface Foot of Soil1

Charles A. Carlson, K. G. Reinhart and J. S. Horton2

ABSTRACT

A method of predicting moisture content in the surface foot of soil has been developed by the U. S. Forest Service in cooperation with the Corps of Engineers, U. S. Army. By this method, moisture can be predicted for a given soil from the wettest to the driest condition that naturally occurs. In the development of the method, soil wetting and drying relationships were determined from detailed soil moisture and concurrent weather records. Wetting in the surface foot was found to depend primarily on the amount of rainfall and the amount of space available for storing water. Drying varied with the moisture level of the soil; it followed a characteristic curve for each season. Information needed for prediction—in addition to the wetting and drying relationships—includes the field maximum moisture content, transition dates for the seasonal depletion curves, and the size of the smallest storm which affects soil moisture. Records and prediction relations are being obtained for 146 experimental sites throughout the United States, Alaska, and Puerto Rico.

NOTES

1 Contribution from Vicksburg Infiltration Project, Southern Forest Experiment Station, Forest Service, U.S.D.A., in cooperation with Waterways Experiment Station, Corps of Engineers, U. S. Army, Vicksburg, Miss. Presented before Div. V-A, Soil Science Society of America, Davis, Calif., Aug. 17, 1955.

2 Soil Scientist and Foresters (Forest Influences), respectively.

Received for publication September 2, 1955.




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Copyright © 1956 by the Soil Science Society of America.