20.3. Methods of Measurement of Evapotranspiration

Try these first

1. 1.

   What does ET stand for?

   Hint

   Consider the two processes involved in ET.

2. 2.

   List one advantage of using lysimeters.

   Hint

   Think about measurement precision.

3. 3.

   What does ET stand for in hydrology?

   • Evapotranspiration
   • Evaporation Time
   • Evaporation Temperature

   Hint

   Think of both evaporation and transpiration.

4. 4.

   The energy balance method is primarily concerned with what?

   • True
   • False

   Hint

   Relate it to conservation principles.

5. 5.

   Given the rainfall data and ET measurements for a region over a month, calculate the remaining water in the soil after accounting for runoff and deep percolation. Consider an input of 120 mm, runoff of 25 mm, and deep percolation of 15 mm with an ET of 60 mm.

   Hint

   Follow the water cycle's budgeting approach.

6. 6.

   Research and analyze the efficiency differences between lysimeter measurements and indirect estimation methods like the Penman equation in a specific crop, summarizing your findings.

   Hint

   Consider both pros and cons standing for each method.