Fig. 3. (A) Seasonal variations in runoff, infiltration, evapotranspiration, and recharge simulated for a 5-meter thick unsaturated zone. The sum of runoff and infiltration are equal to the total rain plus snowmelt for the same period. A difference between infiltration and the sum of evapotranspiration and recharge will result in a change of moisture content in the unsaturated zone. (B) Seasonal recharge for simulated for 1-m, 5-m, and 10-m thick unsaturated zones. Recharge that peaks in the winter at 1-m lags until the following fall before reaching a peak recharge at 10 m. Astronomical seasons are used: Fall (Oct.-Dec.); Winter (Jan.-Mar.); Spring (Apr.-June); and Summer (July-Sept.).