2.1. Curve Number CN

Try these first

1. 1.

   What is runoff?

   Hint

   Think about what happens to rainwater.

2. 2.

   What is the Curve Number range?

   Hint

   Recall the significance of higher numbers.

3. 3.

   What is the Curve Number primarily used for?

   • Estimating runoff
   • Measuring snowfall
   • Determining evaporation

   Hint

   Consider its application in hydrology.

4. 4.

   True or False: Higher Curve Numbers are associated with lower runoff.

   • True
   • False

   Hint

   Remember how runoff works!

5. 5.

   A watershed has a Curve Number of 80 and receives 100 mm of rain. Calculate the runoff. Discuss the implications for flood risk management.

   Hint

   Apply the Curve Number method step-by-step.

6. 6.

   Compare the runoff calculations for two watersheds: one with a CN of 60 (forest) and the other with a CN of 90 (urban) under the same rainfall of 50 mm. Analyze the results.

   Hint

   Use the differences in CN to highlight runoff disparities.