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A Rainfall Simulator with Nonrepetitious Movement of Drop Outlets¹

ABSTRACT

Problems encountered in simulating uniform rainfall inside the laboratory are discussed. A new rain simulator is described which eliminates nonuniformity by a nonrepeating movement of drop outlets. The model tested applies rain to a ring-shaped area of 0.21 m² with a coefficient of variation of about 7%. By using drop outlets of different sizes, one also can adjust the raindrop size distribution.

¹ Contribution from U. S. Salinity Laboratory, AR-SEA, USDA, Riverside, CA 92501.

² Graduate Research Assistant, Soil Scientist, and Machinist, respectively.

Received for publication April 13, 1979. Accepted for publication August 30, 1979.