Earth
Rain and soil: where does the water go?
Watch a wetting front move down through soil while rainfall is divided between infiltration, ponding and runoff.
Try this
Raise rainfall above conductivity. Watch surface ponding and runoff after the initial rapid infiltration.
The model and its limits
Green-Ampt wetting-front model for uniform soil. One simulation minute represents one hour. No layered preferential flow, roots or evaporation.
Equations used in the module
Equations f = K (1 + psi delta_theta / F) rain = infiltration + ponding + runoff
