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Deviations from Darcy's Law in Saturated Clays¹

ABSTRACT

Atmospheric contamination causes an error in the conventional use of air-water menisci and air bubbles in capillary tubes for measuring flow rates through clays. This error gives rise to spurious deviations from the conventional criterion for Darcy's law. Data are presented which show the error can be of sufficient magnitude to account for the deviations from Darcy's law in much of the published data on confined clay samples. The error is negligible compared with the deviations in the published data on unconfined clay and sandstone samples.

¹ Publication authorized by the Director, U. S. Geological Survey. Contribution from the Water Resources Division. Washington, D. C. Presented before Div. S-1, Soil Science Society of America, Nov. 20, 1963, at Denver, Colo.

² Hydraulic Engineer.

Received for publication July 24, 1964. Accepted for publication November 2, 1964.