20.5. Measurement of Pan Evaporation

Try these first

1. 1.

   What is the diameter of a Class A evaporation pan?

   Hint

   Refer to the standard specifications for Class A pans.

2. 2.

   What is the typical range for the pan coefficient?

   Hint

   Think about adjustments necessary for evaporation measurements.

3. 3.

   What is measured using a Class A evaporation pan?

   • Transpiration
   • Evaporation
   • Soil moisture

   Hint

   Remember the purpose of evaporation pans.

4. 4.

   True or False: The pan coefficient Kp always equals 1.

   • True
   • False

   Hint

   Consider the adjustments needed in different environments.

5. 5.

   A region experiences an average evaporation of 22 mm over a month using a Class A pan with a Kp of 0.75. How much water is estimated to be lost through evapotranspiration? Discuss seasonal variations.

   Hint

   Consider how seasonal weather can impact these readings.

6. 6.

   Consider a scenario where two different crops are planted, one with a higher transpiration rate. Discuss how you would adjust the pan coefficients used for accurate ET measurements across different crops.

   Hint

   Reflect on how crop variations affect overall water demand.