Model Equation
The methods used to determine the areas influenced by subsurface drainage systems were based on a Decision Tree Classification (DTC) System described by Naz et al (2009). In the DTC, a dichotomous classification was employed to identify progressively the areas likely to be drained based on membership in land use, soil, and slope characteristics. The DTC in this model is represented as Equation 1:
PAdrained = LU x (SC +