A Spreadsheet for Estimating Soil Water Characteristic Curves (SWCC)
US Army Engineer Research and Development Center CEERD-IS-L Vicksburg United States
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SWCC can be measured in the lab however, due to the cost, time, and high variability in the results, empirical equations were developed using multiple regression approaches on databases consisting of a large number of measured SWCCs. The spreadsheet presented herein utilizes different methods that use basic soil properties, such as grain size distribution and Atterberg limits, to calculate the input parameters for van Genuchten and Fredlund and Xing equations. These parameters are required by numerical models, such as SEEPW, to perform transient seepage analysis. The spreadsheet allows copying the generated curve data points as well as an input into the numerical model. The spreadsheet calculates the SWCCs using seven different methods for comparison. It also compares four closed form models, Gardner 1958, Brooks and Corey 1964, van Genuchten 1980, and Fredlund and Xing 1994, given the model parameters are known.
- Soil Mechanics