Smajstrla, A. G (Allen George).

The Penman equation was used to calculate monthly and average daily potential evapotranspiration (ETp) rates for nine locations in and near Florida. Twenty-five years of weather records were analyzed. Probabilities of occurrence of ETp ranging from the 50% level to the 95% level were tabulated, and a procedure was presented for calculating other probabilities. These ETp values will be useful to irrigation managers, irrigation system designers, and others. interested in climatic effects on crop water use. These probabilities allow irrigation systems to be designed for a known probability of success or failure at locations throughout Florida. They also allow crop water requirements to be estimated at locations through Florida.