5. Mean Precipitation Over an Area

Try these first

1. 1.

   What is the Arithmetic Mean method?

   Hint

   Think about how averages are generally calculated.

2. 2.

   Name one method used to calculate mean precipitation.

   Hint

   Think about methods that account for uneven distribution.

3. 3.

   Which method is most suitable for areas with variable rainfall?

   • Arithmetic Mean
   • Thiessen Polygon Method
   • Isohyetal Method

   Hint

   Think about how accuracy is achieved in different landscapes.

4. 4.

   True or False: The Arithmetic Mean is the best method to use in all scenarios.

   • True
   • False

   Hint

   Consider scenarios with uneven rainfall.

5. 5.

   Calculate the mean precipitation for a region where gauge readings are as follows: Gauge A: 15mm, Gauge B: 25mm, Gauge C: 35mm. Use both the Arithmetic Mean and an imaginary average based on proximity weights where Gauge A is twice as influential as the others.

   Hint

   Consider the weights when calculating.

6. 6.

   In a region where rainfall varies significantly, how would you apply the Isohyetal Method to assess flooding risks? Discuss and propose a method to model rainfall distribution using this approach.

   Hint

   Think about where high rainfall meets urban drainage systems.