Evapotranspiration (ET) from a catchment can be estimated by the Penman-Monteith method using:
Choose the correct answer
Rainfall data alone
Net radiation, temperature, wind speed, and humidity — energy balance + aerodynamic approach (physically based)
Stream discharge only
Only the pan evaporation data
Correct Answer
B. Net radiation, temperature, wind speed, and humidity — energy balance + aerodynamic approach (physically based)
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Penman-Monteith (FAO-56): ETo = [0.408Δ(Rn−G) + γ(900/(T+273))u2(es−ea)] / [Δ + γ(1+0.34u2)]. Uses: net radiation (Rn), soil heat flux (G), air temperature (T), wind speed (u2), actual and saturation vapour pressure (ea, es), psychrometric constant γ. It is the most physically-based ET method. ETo × Kc = ETc (crop ET).
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