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The observed annual runoff from a basin of area 500 km2 is 150 Mm3 and the corresponding annual rainfall over the basin during the same year is 750 mm. What is the runoff coefficient?
1. 0.2
2. 0.67
3. 0.4
4. 0.5

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Correct Answer - Option 3 : 0.4

Explanation

∵ We know that,

Runoff coefficient = Runoff/Rainfall

Given,

Runoff = 150 Mm3

Rainfall depth = 750 mm

Area = 500 km2

Rainfall depth in terms of volume = 0.75 × 500 = 375 Mm3 (1 million-m = 106 m)

Runoff coefficient = 150/375

= 0.4

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