9.1.3. Assumptions

Try these first

1. 1.

   What is the assumption about rainfall distribution in Theissen's method?

   Hint

   Think about how we assume rainfall behaves within a defined area.

2. 2.

   What does 'adequate coverage' refer to in the context of rain gauges?

   Hint

   Consider how data collection from different areas affects accuracy.

3. 3.

   What does the assumption of uniform rainfall distribution imply?

   • Rainfall is varied across the area
   • Rainfall is the same within the polygon
   • Rainfall is only measured at the stations

   Hint

   Think about how rain gauges represent larger areas.

4. 4.

   True or False: Theissen's method considers topographic influences on rainfall distribution.

   • True
   • False

   Hint

   What do we know about how mountains can disrupt rain?

5. 5.

   Evaluate a catchment where only two rain gauge stations are placed far apart. Discuss the potential error in estimating average rainfall using the Theissen Polygon Method.

   Hint

   Consider what the average would look like between the two stations.

6. 6.

   Given a scenario where mountainous terrain affects rain distribution, suggest alternative methods or adjustments to the Theissen method to improve rainfall estimation.

   Hint

   What methods or data sources can you think of that consider elevation?