CropSyst User Manual - sipeaa

Runoff modelsCropSyst provides three options for determining runoff.● No runoff simulation●●SCS curve number methodNumerical solutionNo runoff simulationIn this mode, CropSyst will try to infiltrate all non intercepted precipitation and irrigation.SCS curve number methodRunoff will be determined as a function of current soil moisture content, static soil conditions, andmanagement practices.Runoff is deducted from the water available to enter the soil prior to infiltration.This method requires selection of land management practices and soil hydrologic characteristicsand management, crop and soil parameter files:❍ Land treatment in the management file (xxx is assumed default in fallow conditions).❍ Land use in the crop file.❍ Hydrologic group and hydrologic condition in the soil file.Numerical solutionThis method is available only with the Finite Difference infiltration model.Runoff will be determined as a result of the Finite Difference infiltration model and is deductedafter infiltration. The numerical solution method requires the soil surface storage parameter to bespecified in the corresponding soil file.