Allied & ICAR Exam Bank • ALLIED_1208 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Water Measurement Flumes

Subtopic: Parshall Flumes

Question Statement:

A Parshall flume is uniquely advantageous for measuring discharge in unlined irrigation channels carrying silt because:

Options:

  • (A) Its contracting converging section and downward dipping throat induce high velocity that makes the flume self-cleaning against sediment deposition
  • (B) It operates strictly without any head loss
  • (C) It does not require any calibration
  • (D) It can only function under submerged flow

Answer Key:

A

Step-by-Step Solution & Explanation

The converging walls and inclined throat invert produce an accelerated supercritical jet that sweeps silt and debris cleanly through the throat without clogging.
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