9.3. Comparison Between Theissen and Isohyetal Methods

Try these first

1. 1.

   What does the Theissen Polygon Method primarily estimate?

   Hint

   Think about the purpose of the method.

2. 2.

   Is the Isohyetal Method quick to compute?

   Hint

   Consider the complexity involved in this method.

3. 3.

   Which method provides a more accurate rainfall estimation?

   • Theissen Method
   • Isohyetal Method
   • Both are equal

   Hint

   Think of how each method represents rainfall variation.

4. 4.

   True or False: The Theissen Method can account for topography.

   • True
   • False

   Hint

   Consider the assumptions each method makes about rainfall.

5. 5.

   Given a region with varying but dense rainfall data, create a simulated condition that justifies the usage of the Isohyetal Method over Theissen. Explain your reasoning.

   Hint

   Consider how rainfall changes in relation to elevation and surface features.

6. 6.

   Assuming a network of 10 rain gauges evenly spaced in a small catchment, determine the feasibility of using the Theissen Method compared to using Isohyetal if the catchment shows significant rainfall variation due to proximity to mountains.

   Hint

   Evaluate the advantages of density versus geographical influences on rainfall.