12.3. General Characteristics of DAD Curves

Try these first

1. 1.

   What happens to rainfall depth as the area increases for a fixed duration?

   Hint

   Think about how rain spreads over a larger surface.

2. 2.

   What does the term 'saturation point' refer to?

   Hint

   Consider when soil becomes unable to absorb more water.

3. 3.

   What happens to rainfall depth as the area increases?

   • Increases
   • Decreases
   • Remains Constant

   Hint

   Remember the rule of spreading rainfall over larger surfaces.

4. 4.

   True or False: DAD curves become steeper with increased duration.

   • True
   • False

   Hint

   Consider the overall trend with data points.

5. 5.

   You have a DAD curve that shows a rainfall depth of 80 mm for a 10 km² area over 12 hours. How would this change if the area is expanded to 50 km²? Calculate the expected average rainfall depth if the trend holds.

   Hint

   Use the trend observation that deeper analysis suggests lower average depth as area increases.

6. 6.

   Consider a design storm requiring an analysis of two DAD curves—one representing a local storm and another a regional storm. Discuss how each curve's characteristics would affect design considerations for flooding.

   Hint

   Focus on how depth-area relationships dictate spatial planning.