pet

Potential evapotranspiration (PET) method

Numerous methods exist to calculate potential evapotranspiration. Three of the most widely-used ones are included in SWAT+, the Priestley-Taylor, Penman/Monteith, and Hargreaves equations. The codes for the three methods are listed in the table below. If a method other than Priestley-Taylor, Penman/Monteith, or Hargreaves is recommended for the area, in which the watershed is located, the user can calculate daily PET values with the recommended method and import them into SWAT+.

Code	Option
0	Priestley-Taylor method
1	Penman/Monteith method
2	Hargreaves method
3	Read in PET values

If pet = 3, the PET data needs to be provided in a file name named "pet.cli".