LABORATORY PERCOLATION THROUGH UNDISTURBED SOIL SAMPLES IN RELATION TO PORE-SIZE DISTRIBUTION

Abstract
Exptl. results are given showing relationship between percolation rate and pore-size distribution as detd. by water removal at tensions of 10, 40, and 100 cm. of water. These indicate that rate of percolation is related directly to the diam. of pores, rather than to the square of their diams. as required by the law of viscous flow. The role of trapped air and of large flow channels in percolation is discussed. Neither percolation rate nor pore size measurements alone are sufficient to characterize water movement in soils but together they afford a picture of the momentary physical condition of a soil with respect to water movement.

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