12.1. Concept of Depth-Area-Duration Relationships

Try these first

1. 1.

   Define Depth-Area-Duration relationships in your own words.

   Hint

   Think about the relationship between size, depth, and time.

2. 2.

   What does the Isohyetal method represent?

   Hint

   Consider how we visualize rainfall amounts.

3. 3.

   What happens to rainfall depth as the area increases?

   • Increases
   • Decreases
   • Remains the same

   Hint

   Think about how rain spreads over a bigger space.

4. 4.

   Is the Isohyetal method used to visualize rainfall distribution?

   • True
   • False

   Hint

   Consider how we can see where rain is heavier or lighter.

5. 5.

   Imagine you have historical storm data showing a 150mm rainfall over a 5 km² area in 1 hour. Using the DAD relationship, predict the rainfall depth for a 50 km² area during the same time frame.

   Hint

   Apply the concept that as the area increases, the depth decreases.

6. 6.

   Given a set of DAD curves for different storm types, analyze how the type of storm alters the relationship between area and depth, and recommend design considerations for a new dam.

   Hint

   Consider the characteristics of the analyzed storms.