Allied & ICAR Exam Bank • ALLIED_1236 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Water Measurement Flumes

Subtopic: Cipoletti Weirs

Question Statement:

A Cipoletti weir has trapezoidal side slopes of 1 horizontal to 4 vertical (1:4) specifically engineered to:

Options:

  • (A) Compensate exactly for end contractions, making discharge directly proportional to crest length ($Q = C L H^{1.5}$)
  • (B) Increase structural strength against flood debris
  • (C) Prevent silt from settling on the crest
  • (D) Function under full pipe submergence

Answer Key:

A

Step-by-Step Solution & Explanation

The side flare of 1:4 creates triangular side areas that offset the decrease in effective crest length caused by end contractions, eliminating end-contraction correction factors.
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