COMPARISON OF METHODS FOR CALCULATING VERTICAL DRAINAGE AND INFILTRATION FOR SOILS

Abstract The Youngs, Gardner, Ligon, and numerical analysis techniques for calculating the amounts of one-dimensional, vertical drainage from soil are discussed and compared with each other and with observed data, where possible. The same was done with the Green and Ampt, Philip, and numerical analysis methods for calculating the amounts of infiltration into soil profiles. Numerical analysis gave the best agreement with the observations, but required considerable input data and the calculation procedure was not simple. The Youngs drainage equation and the Green and Ampt infiltration equation were the easiest to use and gave reasonably accurate results, which are probably sufficient for most field problems.

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