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Evaporation from Layered Soils in the Presence of a Water Table¹

ABSTRACT

Evaporation from two-layered soil systems with varying depths to water table is described for steady-state conditions. The difference in evaporation rate from a system of fine-textured soil overlying a coarse soil compared to a homogeneous profile of fine-textured soil may be relatively small. A reversed condition of layers may have a large effect on evaporation rates.

It appears that for many practical purposes the presence of inhomogeneities may be of little consequence when the water table is relatively deep. It also appears that a weighted-average capillary conductivity curve might give satisfactory results in calculating estimated evaporation rates.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA. This work was conducted at the U. S. Salinity Laboratory, Riverside, Calif. Presented before Div. I, Soil Science Society of America, Nov. 19, 1959, at Cincinnati, Ohio.

² Soil Scientist, Western Soil and Water Management Research Branch. Formerly at the U. S. Salinity Laboratory, Riverside, Calif., now at USDA Northern Great Plains Field Station, Mandan, N. Dak.

Received for publication December 2, 1959. Accepted for publication February 22, 1960.