15.7.1.2.1. Arithmetic Mean Method

Try these first

1. 1.

   What is the Arithmetic Mean Method?

   Hint

   Think about how averages work.

2. 2.

   How do you calculate the mean from three readings: 5 mm, 8 mm, and 12 mm?

   Hint

   Add the numbers first, then divide by how many there are.

3. 3.

   What is the Arithmetic Mean Method used for?

   • Estimating areal rainfall
   • Mapping rainfall distribution
   • Identifying water sources

   Hint

   Remember, it revolves around averages.

4. 4.

   True or False: The Arithmetic Mean Method is the most accurate method for estimating rainfall in all scenarios.

   • True
   • False

   Hint

   Consider conditions of rainfall distribution.

5. 5.

   You have rainfall readings of 15 mm, 22 mm, 10 mm, and 25 mm from four different gauges. If you were to use the Arithmetic Mean Method alone, would you be misled if one gauge showed an unusually high reading? Explain.

   Hint

   Think about how adding an extreme value affects averages.

6. 6.

   A city uses the Arithmetic Mean Method to analyze rainfall data from a network of gauges. How would they need to proceed if they discovered one gauge was broken and had recorded zero rainfall?

   Hint

   Consider what impact a zero reading has on the overall average.