5.4. Intensity, Duration, and Frequency of Rainfall

Try these first

1. 1.

   What is rainfall intensity measured in?

   Hint

   It’s a unit of measurement.

2. 2.

   Name one key factor that affects urban flood risk.

   Hint

   Think about how fast the rain falls.

3. 3.

   What is considered high rainfall intensity?

   • < 20 mm/hr
   • 20-50 mm/hr
   • > 50 mm/hr

   Hint

   Consider what happens during heavy rainfalls.

4. 4.

   True or False: Rainfall duration can influence the design of drainage systems.

   • True
   • False

   Hint

   Think about how long it rains.

5. 5.

   Given a region experiences an average rainfall intensity of 70 mm/hr for 3 hours during a storm, calculate the total volume of rain in cubic meters that would fall on an area of 1000 square meters.

   Hint

   Convert mm to meters for calculations.

6. 6.

   Analyze historical rainfall frequency data for your region and predict the likelihood of a 100 mm rain event occurring in a given year. Use any statistical method learned.

   Hint

   Use Gumbel or Log-Pearson distributions for predictions.