17.4.3. Combination Method (Penman Equation)

Try these first

1. 1.

   Define the Penman Equation.

   Hint

   Think about the concepts of energy and mass in relation to evaporation.

2. 2.

   What types of data are needed for the Penman Equation?

   Hint

   Recall the environmental factors that affect evaporation.

3. 3.

   What does the Penman Equation help estimate?

   • Rainfall
   • Evaporation
   • Water flow

   Hint

   Think about which hydrological process involves the transition from liquid to vapor.

4. 4.

   True or False: The Penman Equation requires limited meteorological data.

   • True
   • False

   Hint

   Recall what types of data you need for the equation.

5. 5.

   Given the following values: Δ = 0.1, γ = 0.066, Eₙ = 5.0 mm/day, Eₐ = 4.5 mm/day, calculate the evaporation using the Penman Equation.

   Hint

   Break down the components separately before combining.

6. 6.

   Discuss how the availability of wind speed data affects the application of the Penman Equation in a humid coastal region.

   Hint

   Consider how wind speed interacts with evaporation processes.