16.4.4. Empirical Formulas

Try these first

1. 1.

   Define evaporation.

   Hint

   Think about the hydrological cycle.

2. 2.

   What does e_w represent in Mayer’s Formula?

   Hint

   Look at conditions where water is at equilibrium.

3. 3.

   What does the acronym E represent in the empirical formulas?

   • Energy
   • Evaporation
   • Efficiency

   Hint

   Recall the formulas' full context.

4. 4.

   True or False: Rohwer’s Equation can be applied without knowing wind speed.

   • True
   • False

   Hint

   Think about the variables in the equation.

5. 5.

   Evaluate the evaporation rate using both Mayer’s Formula and Rohwer’s Equation if e_w = 18 mm, e_a = 9 mm, and wind speed is 6 m/s.

   Hint

   Watch how changing K and the speed affects the result.

6. 6.

   In a scenario where there is a drought, analyze which formula would be the best to use, considering data availability. Justify your choice.

   Hint

   Issues of data accessibility and environmental observation count!