6. Depth-Area-Duration (DAD) Relationships

Try these first

1. 1.

   What does DAD stand for?

   Hint

   Think about the three components it represents.

2. 2.

   Why are envelope curves used?

   Hint

   Consider their role in engineering design.

3. 3.

   What does the DAD curve indicate?

   • Average precipitation depth increases with area
   • Average precipitation depth decreases with area
   • Average precipitation depth remains the same

   Hint

   Think about how rainfall spreads over larger areas.

4. 4.

   Are envelope curves necessary for designing drainage systems?

   • True
   • False

   Hint

   Consider their importance in predicting maximum rainfall.

5. 5.

   Using historical rainfall data, create an envelope curve for a hypothetical area measuring rainfall during a 100-year storm return period. Describe the expected precipitation depths.

   Hint

   Focus on how past data helps predict future rainfall scenarios.

6. 6.

   Consider a city planning to expand its infrastructure. Discuss how DAD relationships can influence the layout and design of drainage systems and stormwater management.

   Hint

   Think of stormwater management and how areas with different risk profiles need different designs.