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- Model:TopoFlow-Infiltration-Richards 1D + (The input variables used for modeling infi … The input variables used for modeling infiltration and unsaturated vertical flow with the 1D Richard's equation are defined as follows:</br> K_s = saturated hydraulic conductivity (m / s)</br> K_i = initial hydraulic conductivity (m / s) (typically much less than K_s)</br> θ_s = soil water content at ψ = 0 (unitless) (often set to the soil porosity, φ)</br> θ_i = initial soil water content (unitless)</br> θ_r = residual soil water content (unitless) (must be < θ_i)</br> ψ_B = bubbling pressure head (meters) (also called air-entry pressure, ψ_ae)</br> ψ_A = pressure head offset parameter (meters)</br> λ = pore-size distribution parameter (unitless) (alt. notation = 1/b )</br> η = 2 + (3 * λ) (unitless) (see Notes)</br> c = transitional Brooks-Corey curvature parameter (unitless) (see Notes)</br> dznodes = vertical distance between nodes (meters)</br> nnodes = number of subsurface vertical nodes </br></br>The behavior of this component is controlled with a configuration (CFG) file, which may point to other files that contain input data.point to other files that contain input data.)