online_penman:   Potential evapotranspiration by the Penman method

Formulas

eo = f(Ta)        En = f(Qn,Ta)

Ea = (0.013 + 0.00016v2)eo[(100 - RH)/100]

α = f(Ta)        E = [αEn + Ea]/(α + 1)

Reference

Ponce, V. M., 1989. Engineering Hydrology, Principles and Practices,
Prentice Hall, pages 45-47.
INPUT DATA:

[Description]       [Sample input]

Month:    

Mean monthly air temperature Ta (oC):    

Mean monthly net radiation Qn (cal/cm2/day):    

Relative humidity RH (%):    

Wind velocity at 2-m depth v2 (km/day):    

ECHO OF INPUT:

Please enter input data and press 'Calculate'.

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