Allied & ICAR Exam Bank • ALLIED_1237 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Canal Design and Silt Theories

Subtopic: Canal Seepage Losses

Question Statement:

An unlined earthen canal has a water surface top width of 6.0 m and wetted perimeter of 8.0 m. If the seepage loss rate is $2.5\text{ m}^3/\text{day}$ per 1000 m$^2$ of wetted perimeter, the water loss per kilometer length of canal in m$^3$/day is:

Answer Key:

20

Step-by-Step Solution & Explanation

Wetted area per km $= P \times L = 8.0\text{ m} \times 1000\text{ m} = 8000\text{ m}^2$. Seepage loss $= 8000 \times \frac{2.5}{1000} = 20.0\text{ m}^3/\text{day}$.
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