Define the following: Pan evaporation (Ep), Potential evapotranspiration (PET), Reference crop evapotranspiration (ET0), Actual evapotranspiration (AET).
- Ep = defined experiment of a pan filled with water in order to replicate nearby open water evaporation.
- PET = Evapotranpiration that would occur from another well vegetated surface under existing atmospheric condition and when moisture supply is not limiting
- ET0 = Rate of ET from an area planted with a specific crop (grass or alfalfa), where water availability is not a limiting factor
- AET = Evapotranspiration that occurs under actual soil, ground-cover, and water-availability conditions