15. Infiltration Indices

Try these first

1. 1.

   Define the Φ-index.

   Hint

   Think of a rate that stays constant over time.

2. 2.

   What does the W-index focus on?

   Hint

   What aspect does it not consider?

3. 3.

   What does the Φ-index measure?

   • Only rainfall
   • Average water loss due to infiltration
   • Surface runoff

   Hint

   Consider what the index reflects regarding water loss.

4. 4.

   True or False: The W-index includes initial water losses.

   • True
   • False

   Hint

   Think about how it's defined.

5. 5.

   Given a rainfall event of 200 mm and an estimated Φ-index of 80 mm, calculate the runoff. Discuss the implications if this estimate is incorrect.

   Hint

   Focus on the calculation first and then reason through consequences.

6. 6.

   During a rainfall event, the W-index starts at 50 mm and drops to 30 mm by the end. Discuss how continuous changes in the W'-index can affect water resource planning.

   Hint

   Think about continuous data tracking and its effect on decisions.