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Q: Trapezoidal sections ith rounded corners for large canals or triangular sections with circular bottoms for small canals are the most suitable sections for _______ canals.
  • A. lined
  • B. semi-lined
  • C. unlined
  • D. earthen
Correct Answer: Option A - The most economical section of a lined canal is a triangular section with circular bottom for small discharges and trapezoidal section with rounded corners for high discharges (canal). • When an impermeable layer is provided at bottom and sides of canal it is known as lining of canal. Lining of a canal is necessary when– • To minimize the seepage losses in canal • To prevent erosion of bed and sides due to high velocities. • To increase discharge in canal section by increasing the velocity.
A. The most economical section of a lined canal is a triangular section with circular bottom for small discharges and trapezoidal section with rounded corners for high discharges (canal). • When an impermeable layer is provided at bottom and sides of canal it is known as lining of canal. Lining of a canal is necessary when– • To minimize the seepage losses in canal • To prevent erosion of bed and sides due to high velocities. • To increase discharge in canal section by increasing the velocity.

Explanations:

The most economical section of a lined canal is a triangular section with circular bottom for small discharges and trapezoidal section with rounded corners for high discharges (canal). • When an impermeable layer is provided at bottom and sides of canal it is known as lining of canal. Lining of a canal is necessary when– • To minimize the seepage losses in canal • To prevent erosion of bed and sides due to high velocities. • To increase discharge in canal section by increasing the velocity.