Developing joint probability distributions of soil water retention characteristics

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<jats:p>A method is presented for developing probability density functions for parameters of soil moisture relationships of capillary head [<jats:italic>h</jats:italic>(θ)] and hydraulic conductivity [<jats:italic>K</jats:italic>(θ)]. These soil moisture parameters are required for the assessment of water flow and solute transport in unsaturated media. The method employs a statistical multiple regression equation proposed in the literature for estimating [<jats:italic>h</jats:italic>(θ)] or [<jats:italic>K</jats:italic>(θ)] relationships using the soil saturated water content and the percentages of sand and clay. In the absence of known statistical distributions for either [<jats:italic>h</jats:italic>(θ)] or [<jats:italic>K</jats:italic>(θ)] relationships, the method facilitates modeling by providing variability estimates that can be used to examine the uncertainty associated with water flow or solute transport in unsaturated media.</jats:p>

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