The total rainfall in a catchment of area 1200 km^2 during a 6 h storm is 160 mm. If the total runoff is 600 hectare-meters, the infiltration index (phi-index) is:

Why is this the answer?

Total rainfall = 160 mm = 16 cm. Runoff = 600 ha-m = 6,000,000 m^3. Area = 1200 km^2 = 120,000 ha. Runoff depth = (600 ha-m / 120,000 ha) = 0.005 m = 0.5 cm. Total loss = 16 - 0.5 = 15.5 cm. Phi-index = 15.5 cm / 6 h = 2.58 cm/h. Given the original options are likely based on a different runoff value, the question is mathematically incomplete.

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