Eric_in_Tn,
How deep is your theoretical pond. Say, if it's 12 feet deep and you get 50 inches of rain directly into it, theoretically you will have 4 feet 2 inches per year. But, you have 37 inches of evaporation, which means you have a net of 13 inches per year staying in the pond. Theoretically to fill a 12 deep pond would take you around 12 years, not including soil saturation. How old are you?
