If the drainage coefficient is 3 cm/day, then the flow rate through drains of watershed of area 1500 hectares is

Correct option is B

✅ (b) 5.2 m³/s
· Drainage discharge (Q) = (Drainage Coefficient × Area) / Time
· Given: Drainage coefficient = 3 cm/day = 0.03 m/day Area = 1500 ha = 15,000,000 m² Q = (0.03 × 15,000,000) / (24 × 3600) Q ≈ 5.2 m³/s
· This calculation converts the daily drainage to flow rate per second.
❌ (a) 2 m³/s
· Underestimated value due to miscalculation of area or conversion factor.
· Incorrect.
❌ (c) 0.2 m³/s
· This is 25 times less than the correct value. Gross underestimation.
· Incorrect.
❌ (d) 0.5 m³/s
· Also a significant underestimation. Incorrect computation.
· Hence, wrong.