Question
Download Solution PDFPenman's equation is based on
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Evapotranspiration Equation:
There are large number of evapotranspiration equations available, they are purely empirical and not theoretical. The most used equation is Penman's Equation.
Penman's Equation:
Penman's equation is based on sound theoretical reasoning and is obtained by combination of energy and mass transfer approach.
\(PET = \frac{{A{H_n} + {E_a}γ }}{{Aγ }}\)
PET = Daily potential evapotranspiration (in mm per day)
A = Slope of the saturation vapour pressure vs. temperature curve at the mean air temperature (in mm of Hg per °C)
Hn = Net radiation
Ea = Parameter including wind velocity and saturation deficit.
γ = Psychromrtic constant = 0.49 mm of Hg/°C
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