18.2.1. Pan Evaporation Method

Try these first

1. 1.

   What does K represent in the pan evaporation formula?

   Hint

   Think of its role in making measured data applicable to the reservoir.

2. 2.

   Name a factor that must be considered when selecting a site for an evaporation pan.

   Hint

   Consider how these factors might affect evaporation readings.

3. 3.

   What is the main formula used in the Pan Evaporation Method?

   Hint

   Remember the components of the formula!

4. 4.

   True or False: The pan coefficient K is always equal to 0.8.

   • True
   • False

   Hint

   Consider the variability of conditions affecting the coefficient.

5. 5.

   A research team wants to estimate the annual evaporation from a large reservoir they manage, which spans 400 hectares. They collect pan evaporation data showing daily averages of 6 mm and decide to use a pan coefficient of 0.7. Calculate the total annual evaporation loss in cubic meters.

   Hint

   Make sure to convert your units properly before using the formula.

6. 6.

   Discuss potential errors in using the Pan Evaporation Method for a small reservoir surrounded by heavy vegetation. What adjustments or considerations should be made?

   Hint

   Think about how the environment around the pan can drastically change its effectiveness.