31.3 - Common Infiltration Indices
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Practice Questions
Test your understanding with targeted questions
What does the φ-index represent?
💡 Hint: Think about how rainfall exceeds what can be absorbed.
Name a factor that the W-index considers that the φ-index does not.
💡 Hint: Consider how much water gets intercepted before infiltrating.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does the φ-index fail to account for?
💡 Hint: Think about what happens before water begins to infiltrate.
True or False: The W-index gives a more accurate representation of infiltration by including initial losses.
💡 Hint: Recall the definition of the W-index.
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Challenge Problems
Push your limits with advanced challenges
During a heavy storm, you total 100 mm of rainfall over 5 hours, with an observed runoff of 40 mm and initial abstraction of 15 mm. Calculate the φ-index and W-index.
💡 Hint: Use the relevant formulas for each index.
Consider a scenario where you have a test catchment with a varying rainfall and runoff pattern. How would you analyze which infiltration index to use, based on historical data?
💡 Hint: Identify the data characteristics and storm behavior.
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