11.2. Implementation

Try these first

1. 1.

   What is runoff?

   Hint

   Think about what happens to rain that doesn’t soak into the ground.

2. 2.

   What does the SCS-CN method estimate?

   Hint

   Recall the factors that influence this method.

3. 3.

   What is the primary factor determining the amount of runoff generated after a storm?

   • Soil Type
   • Rainfall Amount
   • Land Use

   Hint

   Consider the impact of heavy rainfall on saturated soils.

4. 4.

   True or False: Higher curve numbers indicate a higher likelihood of infiltration.

   • True
   • False

   Hint

   Reflect on how curve numbers are defined.

5. 5.

   Calculate the runoff if the precipitation is 150 mm and the losses are 30 mm.

   Hint

   Use the formula for runoff.

6. 6.

   Evaluate how different types of land uses can change the curve number and consequently the runoff in a watershed area.

   Hint

   Picture how each land use affects soil saturation and perviousness.