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This article in SSSAJ

  1. Vol. 34 No. 1, p. 14-18
    Received: May 5, 1969



A Comparison of Two Methods for Determining Soil Water Diffusivity1

  1. H. M. Selim,
  2. Don Kirkham and
  3. M. Amemiya2



Two methods were used concurrently to determine the soil water diffusivity from horizontal infiltration of water into a soil column. In the first (recent), water content measurements were taken at a fixed position as a function of time by using the gamma attenuation technique. In the second, water content distance distributions were determined as a function of distances from the water source at a fixed time by sectioning the same column. A comparison by the two methods of the diffusivity function for three soil materials showed that the first method is as reliable as the second. Agreement of the diffusivities obtained from the two methods is considered evidence of the validity of the unsaturated water flow equation.

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