3.2.1. Design Flood Estimation

Try these first

1. 1.

   What does the Unit Hydrograph Method estimate?

   Hint

   Think about how we can measure water flow over time.

2. 2.

   What does SCS-CN stand for?

   Hint

   It relates to a method for runoff estimation.

3. 3.

   What is the primary purpose of the Unit Hydrograph Method?

   • A) To estimate land area
   • B) To calculate peak runoff response to rainfall
   • C) To determine soil types

   Hint

   Focus on what Hydra involves.

4. 4.

   True or False: The Rational Method is effective for large, rural areas.

   • True
   • False

   Hint

   Think about its applications and limitations.

5. 5.

   Given a watershed area of 150 acres with a runoff coefficient of 0.3 and a storm with an intensity of 2.5 inches per hour, calculate the peak runoff using the Rational Method.

   Hint

   Remember unit conversions!

6. 6.

   Analyze the flood response of two different watersheds: one with urban development and a high impervious surface ratio and another with rural terrain. Discuss how the Unit Hydrograph and Rational Method would differ in their estimates.

   Hint

   Think about the characteristics of each type of surface related to runoff.