Fig. 5. Estimated recharge percentage as a function of available moisture. Recharge percentage represents the best estimate of long-term steady-state drainage as a percentage of annual precipitation. PET/P values represent estimated annual potential evapotranspiration divided by average annual precipitation. Bubble size is 1/N, with N being the number of data points used to calculate recharge percentage. Large bubbles represent fewer data points. No definitive relationship between recharge and available moisture is apparent, perhaps due to variations in vegetation cover.