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