19.5.1. Empirical Methods

Try these first

1. 1.

   What are empirical methods?

   Hint

   Think about how we use data in science.

2. 2.

   Name one empirical method for estimating ET.

   Hint

   Remember the methods we discussed in class.

3. 3.

   What does the Blaney-Criddle method estimate?

   • Annual rainfall
   • Evapotranspiration
   • Soil moisture

   Hint

   Focus on what we learned about the aim of this method.

4. 4.

   True or False: The Hargreaves method incorporates mean temperature.

   • True
   • False

   Hint

   Recall the details of the method's formula.

5. 5.

   Estimate the ET using the Blaney-Criddle method when T = 28°C and daylight hours are 12. What would be the % of annual daylight hours for a month with 30 days?

   Hint

   Think about the calculation steps - remember the formula.

6. 6.

   Using the Hargreaves method, if T_max = 30°C, T_min = 20°C, R_a = 15 MJ/m2, calculate ET.

   Hint

   Apply the correct inputs step by step in the formula.