31.4 - Selection of Appropriate Index
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Practice Questions
Test your understanding with targeted questions
What index should be used if both rainfall and runoff data are available?
💡 Hint: Think about which index relies directly on runoff and rainfall data.
Name an infiltration index that considers initial losses.
💡 Hint: Remember the index that modifies the φ-index for accurate infiltration measures.
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Interactive Quizzes
Quick quizzes to reinforce your learning
Which index is easier to apply if both runoff and rainfall data are available?
💡 Hint: Think about which index does not require additional information.
True or False: The W-index includes initial losses in its calculation.
💡 Hint: Recall what adjustments the W-index makes compared to the φ-index.
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Challenge Problems
Push your limits with advanced challenges
A study area in an urban environment has recorded a total rainfall of 100 mm with a direct runoff of 60 mm. If initial losses are estimated to be 15 mm, calculate both the φ-index and W-index.
💡 Hint: Ensure you understand the formulas for both indices and remember to define `t`.
Given a short-duration storm produces heavy runoff in a basin with mixed soils, discuss why the selection of the W min-index is critical for runoff assessment in this situation. What would the consequences be of using the φ-index instead?
💡 Hint: Think about how each index responds differently to storm events.
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