16.6.4. Estimation Methods

Try these first

1. 1.

   What does the Blaney-Criddle method estimate?

   Hint

   Think about what factors influence water loss.

2. 2.

   Which method adjusts for seasonal variations?

   Hint

   Consider which method we've discussed that relates to temperature.

3. 3.

   Which method is suited for estimating ET when climatic data is scarce?

   • Blaney-Criddle
   • Hargreaves
   • Penman-Monteith

   Hint

   Think about which methods have less data requirement.

4. 4.

   True or False: The Thornthwaite method is only applicable in humid climates.

   • True
   • False

   Hint

   Consider how adaptable this method is.

5. 5.

   A farmer has recorded a temperature of 30°C and an average of 12 daylight hours using the Blaney-Criddle method. Calculate the potential evapotranspiration if K is set at 0.25.

   Hint

   Plug in the temperature and daylight values into the formula.

6. 6.

   Using the Penman-Monteith method, if you have the net radiation as 300 W/m², wind speed at 2 m/s, and vapor pressure deficit as 2 kPa, estimate the potential evapotranspiration.

   Hint

   Remember how wind speed and radiation influence the ET!