21.2.1. Introduction to Penman Equation

Try these first

1. 1.

   What does ET stand for?

   Hint

   Think about the process of water moving into the atmosphere.

2. 2.

   Name one component of the Penman Equation.

   Hint

   This involves incoming solar energy.

3. 3.

   What does the acronym ET stand for in the context of the Penman Equation?

   Hint

   Think about the evaporation process mixed with plant processes.

4. 4.

   The Penman method is primarily used for estimating:

   • Actual Evapotranspiration
   • Potential Evapotranspiration
   • Soil Moisture

   Hint

   Focus on the word 'potential.'

5. 5.

   Calculate the potential evapotranspiration given the following parameters: Rn = 15 MJ/m²/day, Δ = 0.1 kPa/°C, γ = 0.067 kPa/°C, f(u) = 0.8, e_s = 2.5 kPa, e_a = 1.5 kPa.

   Hint

   Make sure to follow the order of operations and pay attention to units.

6. 6.

   Discuss how the lack of wind speed data would affect the estimates made using the Penman Equation in a specific region.

   Hint

   Think about the impact of wind on moisture loss.