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The canal system does not consist ______________

(a) main canal

(b) branch canal

(c) sub-main canal

(d) major distributary

I got this question in my homework.

This key question is from Reports on Estimate for the Construction of Road and Irrigation Channel topic in division Valuation, Reports Technical and Design Data of Civil Engineering Drawing

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Right choice is (c) sub-main canal

For explanation I would say: Main Canal-Main Canal takes off directly from the upstream side of weir head works or dam. Usually no direct cultivation is proposed. Most of the main canals are aligned as contour canals to derive benefit.

Branch Canal-All off takes from main canal with head discharge of 14-15 cumecs and above are termed as branch canals.

Major Distributary-All off takes from main canal or branch canal with head discharge from 0.028 to 15 cumecs are termed as major distributaries.

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