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AnnAGNPS Continuous Simulation Model Processes
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Soil Moisture and Curve Number Runoff
Daily soil moisture accounting considers runoff, evapotranspiration, and percolation in maintaining a water budget for the 2-layer
soil system. Runoff is calculated using the curve number method. Curve numbers vary between the Antecedent Moisture Condition
(AMC I --dry) value and the AMC III (wet) value using the procedure in the SWRRB and EPIC models. Potential evapotranspiration is
calculated with the Penman equation, and actual evapotranspiration is a function of this and soil moisture content. Percolation
occurs at the rate of the hydraulic conductivity corresponding to the soil moisture content, calculated according to the Brooks-Corey equation.
Contact:
Fred Theurer or
David Garen.
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