Estimation of SWCC

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Seepage modeling requires the use of the Soil-Water Characteristic Curve (SWCC) to present the water content of a soil under various soil suctions. The SWCC is typically measured experimentally using a pressure-plate apparatus. The laboratory testing procedure is quite costly and in some situations, alternate estimation methods are desirable. SVSOILS implements seven estimation techniques (also called pedo-transfer functions) for predicting the SWCC. Pedo-transfer functions are estimated equations based on soil classification data. The following section outlines the techniques that can be used for the estimation of the SWCC. These theoretical methods are most often based on grain-size information for the material under consideration. A description of each of the methods can be found in the SVSOILS Theory Manual.