19.5.1.2. Hargreaves Method

Try these first

1. 1.

   What does the Hargreaves Method estimate?

   Hint

   Think about what losses occur from the soil and plants.

2. 2.

   What key temperature inputs are used in the Hargreaves Method?

   Hint

   These are daily temperature readings.

3. 3.

   What is the primary purpose of the Hargreaves Method?

   • To measure rainfall
   • To estimate evapotranspiration
   • To calculate soil moisture

   Hint

   Remember what process it addresses in hydrology.

4. 4.

   True or False: The Hargreaves Method requires extensive meteorological data to function accurately.

   • True
   • False

   Hint

   Think about its application in data-scarce areas.

5. 5.

   Consider a scenario where the mean temperature is 22°C, T_max is 30°C, T_min is 14°C, and Ra is 10 MJ/m². Calculate ET using the Hargreaves Method.

   Hint

   Pay close attention to the execution of the square root and multiplications involved.

6. 6.

   Discuss the limitations of using the Hargreaves Method in humid climates. What factors may skew the ET predictions?

   Hint

   Consider what excess water does to the plants and evaporation processes.