32.4.2. Key Equations

Try these first

1. 1.

   What does $Q$ represent in the runoff depth equation?

   Hint

   Look at the definitions we discussed.

2. 2.

   What affects the initial abstraction in runoff calculations?

   Hint

   Recap the variables related to maximum retention.

3. 3.

   What does the equation $Q = \frac{(P - I)^2}{(P - I + S)}$ calculate?

   • A. Runoff Depth
   • B. Rainfall Depth
   • C. Initial Abstraction

   Hint

   Think about the context of the equation.

4. 4.

   True or False: The Curve Number can only range from 0 to 100.

   • True
   • False

   Hint

   Recall the range discussed in class.

5. 5.

   Given a rainfall event with 80 mm of rain, an initial abstraction of 10 mm, and a curve number of 90, calculate the runoff depth and discuss what this says about runoff potential.

   Hint

   Ensure to follow the steps discussed for calculating runoff.

6. 6.

   Compare two watersheds with CN values of 70 and 85. Discuss the implications of these values for runoff management and water resource planning.

   Hint

   Analyze the role of land use and soil characteristics in each scenario.