5.4.2. Rainfall Duration

Try these first

1. 1.

   What does rainfall duration refer to?

   Hint

   Think about the time aspect of rainfall.

2. 2.

   Can short-duration rainfall lead to floods?

   Hint

   Consider the intensity of rainfall.

3. 3.

   What is rainfall duration?

   • The amount of rain in mm
   • The length of time it rains
   • The type of rain event

   Hint

   Consider what measures time in weather events.

4. 4.

   True or False: Longer rainfall durations lead to higher potential runoff.

   • True
   • False

   Hint

   Recall how saturation affects runoff.

5. 5.

   You have two rainfall events: one lasting 30 minutes with an intensity of 70 mm/hr, and the other lasting 5 hours with an intensity of 15 mm/hr. Calculate the total rainfall for each event and discuss the potential impacts on runoff.

   Hint

   Consider both rainfall duration and intensity when calculating.

6. 6.

   Evaluate the effect of different rainfall durations on a reservoir designed for a maximum inflow of 200 m³/s. If a short heavy rain with high intensity occurs, what measures should be taken to prevent overflow?

   Hint

   Think about emergency planning and spill management.