1.1. Types of Runoff

Try these first

1. 1.

   What is surface runoff?

   Hint

   Think about water movement after a rain.

2. 2.

   Define base flow.

   Hint

   Consider the source of water during times without rain.

3. 3.

   What is surface runoff?

   • Water that flows under the ground
   • Water that flows over the land surface
   • Water that evaporates into the air

   Hint

   Think about the direction of water movement.

4. 4.

   True or False: Subsurface runoff comes from groundwater.

   • True
   • False

   Hint

   Consider where the water originates after rainfall.

5. 5.

   A river basin has an area of 200 hectares and experiences a rainfall event of 60 mm with a CN of 75. Calculate the runoff using the SCS Curve Number method.

   Hint

   Use the initial abstraction equation carefully to get the runoff volume.

6. 6.

   Design a small water management plan for an urban area where surface runoff is a concern. List the vegetation strategies to enhance infiltration and reduce runoff volume.

   Hint

   Consider the landscape and types of vegetation that could thrive in urban settings.