🌧️ Green-Ampt Infiltration Lab: Soil Column Wetting Front, Ponding Time and Runoff from a Rainstorm

Rain a storm onto a glass-sided soil column and watch the Green-Ampt wetting front sink, surface water pond, and the excess run off into a measuring tank. Switch soils from sand to clay, vary intensity and initial moisture, and compare the time-stepped model with the closed-form ponding time and the implicit infiltration equation.