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Instrument for Automatic Recording of Rainfall and Pan Evaporation¹

ABSTRACT

An economical combination rain gage and evaporation pan has been developed to provide a useful and dependable tool for soil and water management studies. Two simple direct-acting float devices were designed to provide alternate methods for sensitive water level control. The simpler of these devices controlled water level to ± 0.22 mm, whereas the more complex device controlled the level to ± 0.01 mm. This instrument, with minor modification, can be used to automatically monitor water supplied to a ponded-water infiltrometer or to a watertable lysimeter.

¹ Contribution from the Soil & Water Conservation Research Division, ARS, USDA, in cooperation with the Agr. Exp. Sta., University of Nevada. Journal Series no. 133.

² Research Soil Scientist, Southwest Branch, Reno, Nevada and Agricultural Research Technician, Northern Plains Branch, Sidney, Mont.

Received for publication September 5, 1969. Accepted for publication November 28, 1969.