Question

What is the drainage coefficient in an agricultural watershed of 1500 ha discharging through a drain at an average rate of 2.5 m³/s?

• A. 1.22 cm/day
• B. 1.44 cm/day
• C. 1.66 cm/day
• D. 1.88 cm/day

Hint:

Drainage coefficient is the volume of water drained per unit area per day, expressed in cm/day.

Answer 1

The Correct Option is B

Step 1: Understanding Drainage Coefficient
\[ \text{Drainage Coefficient} = \frac{\text{Discharge (m}^3\text{/s) } \times 86400}{\text{Area (ha) } \times 10000} \]
Step 2: Substituting Values
\[ = \frac{2.5 \times 86400}{1500 \times 10000} = 1.44 \text{ cm/day} \]