Allied & ICAR Exam Bank • ALLIED_1223 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Agricultural Drainage and Salinity

Subtopic: Drainage Coefficient

Question Statement:

An agricultural watershed of area 200 hectares has a design drainage coefficient of $12\text{ mm/day}$ ($0.012\text{ m/day}$). The required capacity of the main drainage ditch outlet in m$^3$/s is:

Answer Key:

0.278

Step-by-Step Solution & Explanation

Daily volume to be removed $= 200 \times 10,000\text{ m}^2 \times 0.012\text{ m} = 24,000\text{ m}^3/\text{day}$. Discharge $Q = \frac{24,000}{86,400\text{ s}} \approx 0.2778\text{ m}^3/\text{s}$.
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