The phi-index of a storm is defined as the constant infiltration rate that makes the rainfall excess equal to the:
Correct answer: A. Direct surface runoff volume
- A. Direct surface runoff volume
- B. Total basin storage
- C. Groundwater recharge volume
- D. Potential evaporation volume
Explanation
The phi-index is an average infiltration rate selected so that rainfall above this rate equals the storm's direct runoff. It is a simplifying index and does not directly represent total groundwater recharge.
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