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Published in Soil Sci Soc Am J 61:1041-1043 (1997)
© 1997 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Miniature Rain Simulator for Field Measurement of Soil Infiltration

C. B. Ogden*, H. M. van Es and R. R. Schindelbeck

Department of Soil, Crop, and Atmospheric Sciences, Cornell Univ., Ithaca, NY 14853

*Corresponding author (cbol{at}cornell.edu).

ABSTRACT

In studies of erosion, runoff, and infiltration, high soil variability may demand many replicate measurements and rapid, inexpensive methodology. We developed a drop-forming rainfall simulator in which flow through long, coiled capillary drip tubes is controlled by an adjustable Mariotte-type bubbling tube. These rain simulators are inexpensive, rugged, simple to operate, easily transported, and require minimal maintenance. Responses to pressure head and water temperature changes were determined for two simulators using tap water. Flow response to pressure head changes corresponded closely to that predicted by Poiseuille's Law. Response to increasing water temperatures was somewhat less than predicted, due to formation of bubbles in the capillary tubes. Simulators incorporating long, coiled capillary tubes can provide combinations of low flow rates and large drop sizes, or a desired range of flow rates when appropriate drip tube diameters, lengths, and numbers of tubes per unit area are combined.

Received for publication March 20, 1995.


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Copyright © 1997 by the Soil Science Society of America.