7.3.1. WMO Guidelines

Try these first

1. 1.

   What is the minimum number of rain gauges recommended for flat regions?

   Hint

   Think about how many square kilometers a flat region covers.

2. 2.

   What does WMO stand for?

   Hint

   It's an international organization focused on weather science.

3. 3.

   What is the density of rain gauges recommended for mountainous regions?

   • 1 per 250 km²
   • 1 per 625 km²
   • 1 per 100 km²

   Hint

   Recall the specific recommendations set forth by WMO.

4. 4.

   True or False: Urban areas need less density of rain gauges than flat regions.

   • True
   • False

   Hint

   Remember the density requirements stated in the guidelines.

5. 5.

   A region has been urbanized significantly, and data shows that the rainfall variability is now 0.5. If planners originally wanted a density of 1 gauge per 500 km², how should they adjust their gauge placement?

   Hint

   Make sure to recalculate the density based on the new coefficient of variation.

6. 6.

   In a flat region of 1000 km², how many rain gauges would be necessary according to WMO guidelines? How does that change if you consider urbanization?

   Hint

   Calculate the number of gauges based on the area and the guideline provided.