10.4. Estimation Techniques

Try these first

1. 1.

   What is the Arithmetic Mean Method used for?

   Hint

   Think of averaging values.

2. 2.

   Why is the Normal Ratio Method important?

   Hint

   Consider conditions affecting rainfall.

3. 3.

   What does the Arithmetic Mean Method assume about surrounding rainfall?

   • A: Rainfall amounts are highly variable
   • B: Rainfall amounts are uniform
   • C: Rainfall data is consistent over time

   Hint

   Consider how averaging works.

4. 4.

   True or False: The Normal Ratio Method requires long-term rainfall normals.

   • True
   • False

   Hint

   Think about what 'normal' means in data context.

5. 5.

   You have three neighboring stations with recorded rainfalls of 110 mm, 120 mm, and 115 mm. If one station is missing data during a similar season, use the Arithmetic Mean Method to estimate the rainfall.

   Hint

   Remember to sum and divide by the number of stations.

6. 6.

   Consider a scenario where one station's normal rainfall is significantly higher than the others by 30%. Explain how you would apply the Normal Ratio Method to estimate its missing data.

   Hint

   Think about how to establish the ratio effectively.