31.2 - Need for Infiltration Indices
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Practice Questions
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Define infiltration in your own words.
💡 Hint: Think about what happens when it rains.
What is the purpose of infiltration indices?
💡 Hint: Consider how they relate to runoff.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What do infiltration indices help estimate?
💡 Hint: Focus on the purpose of these indices.
T/F: The φ-index considers initial abstraction losses.
💡 Hint: Think about the definitions of both indices.
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Challenge Problems
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In a region where the average rainfall is 80 mm during a storm, and through analysis it’s determined that 30 mm runoff occurs and 15 mm in initial losses, calculate the W-index for a storm of 2 hours duration.
💡 Hint: Make sure you plug in the right numbers for P, Q, and I.
Discuss the conditions under which infiltration indices become less effective in predicting runoff.
💡 Hint: Consider the assumptions made when deriving the indices.
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