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Penman’s evapo-transpiration equation is based on
  • a)
    Water budget method 
  • b)
    Energy balance method 
  • c)
    Mass transfer method 
  • d)
    Energy balance and mass transfer approach
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Penman’s evapo-transpiration equation is based ona)Water budget ...
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Penman’s evapo-transpiration equation is based ona)Water budget ...
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 = 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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Penman’s evapo-transpiration equation is based ona)Water budget methodb)Energy balance methodc)Mass transfer methodd)Energy balance and mass transfer approachCorrect answer is option 'D'. Can you explain this answer?
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