27.6.1 - φ-Index
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Practice Questions
Test your understanding with targeted questions
What does the φ-Index signify?
💡 Hint: Think of the relationship between rainfall and water that flows over the surface.
How is the φ-Index calculated?
💡 Hint: Focus on the total rainfall and runoff values.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the primary purpose of the φ-Index?
💡 Hint: Remember its relationship with rainfall and surface runoff.
Is the φ-Index dependent on initial soil moisture content?
💡 Hint: Consider how wet soils behave differently than dry soils.
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Challenge Problems
Push your limits with advanced challenges
A rainfall event produces 120 mm of rain and results in 40 mm of runoff over a duration of 3 hours. Calculate the φ-Index, then discuss how varying rainfall intensities might impact this value.
💡 Hint: Focus on applying the φ formula first, then analyze intensity impacts.
Imagine a city that has an average φ-Index of 15 mm/hr. Predict how changes in land use due to increased impervious surfaces might affect this value and potential flooding risks.
💡 Hint: Consider urban development impacts on water absorption during rainfall.
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