7. Maximum Intensity/Depth-Duration-Frequency (IDF/DDF) Relationship

Try these first

1. 1.

   Define the term 'IDF Curve'.

   Hint

   Think about what rainfall data you are working with.

2. 2.

   What does 'return period' mean?

   Hint

   Consider how frequently weather events happen.

3. 3.

   What does an IDF curve represent?

   • Rainfall distribution
   • Rainfall intensity
   • duration
   • and frequency
   • Rainfall evaporation

   Hint

   Remember how rainfall events are classified.

4. 4.

   Is a 100-year storm expected to occur every 100 years?

   • True
   • False

   Hint

   Think about statistical probabilities versus events.

5. 5.

   Given a set of rainfall data, create an IDF curve plotting rainfall intensity against duration for 2, 5, and 10-year return periods.

   Hint

   Ensure to apply the Gumbel distribution for accuracy when estimating rainfall intensity.

6. 6.

   Discuss how climate change might affect the ability of IDF curves to predict future rainfall events.

   Hint

   Think about how historical data represents past conditions that may no longer hold.