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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
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Publication Number: FHWA-HRT-08-057
Date: November 2008
1 inch = 25.4 mm
32 °F = 0 °C (Deduct 32, then multiply by 5, then divide by 9).
Note: For soil layers, The Fredlund Soil Water Characteristic Curve model is used to relate soil suction to water content. Fredlund parameters af and hr have units of psi. Parameters of bf and cf are unitless. Parameter af is a measure of air entry, the soil suction at which the soil becomes less than 100-percent saturated. Parameters bf and cf determine the rate of change of moisture content versus suction as it transitions from saturated to unsaturated (no free water). hr defines the slope of the curve after free water is removed.
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