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Leachability of a Wetting Agent Treatment for Water-Resistant Soils

ABSTRACT

Burned chaparral watersheds in southern California have been found to possess a "nonwettable" soil property. This resistance to wetting is believed to be instrumental in producing high surface runoff and erosion rates during storm periods. A laboratory leaching study was conducted to estimate the teachability of a remedial wetting agent treatment in this problem soil. Results from the study showed that the wetting agent treatment persisted after 40 cm of water have passed through the soil samples.

Key Words: chaparral watersheds • southern California • nonwettable soils

¹ Contribution from the Pacific Southwest Forest and Range Exp. Sta., Forest Serv., USDA, Glendora, Calif. Presented before Div. S-1, Soil Sci. Soc. Amer., Columbus, Ohio, Nov. 3, 1965.

² Research Forester and Soil Scientist, respectively.

Received for publication December 5, 1966. Accepted for publication July 11, 1967.