A laboratory method based upon time dependent soil‐water content distributions is presented for calculating isothermal soilwater diffusivity values for soils at 5 to 15 volume percent water. The redistribution of water within sealed soil columns was monitored by gamma‐radiation attenuation at approximately 100 to 1,000 hour intervals over a period exceeding 3 months. Diffusivity values from numerical integration of the diffusion equation were obtained easily and compared favorably with those of previous investigators.
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Cassel et al. (1968) studied this question.