Question

Which of the followings are the rules for construction and installation of weirs:
A. Weir should be installed in a straight line at right angle to the direction of flow
B. Velocity of approach of water to the weir should be maximum
C. Crest and sides of the edge should be sharp
D. Velocity of approach of water to the weir should be negligible
E. The head over the weir should be measured on the upstream side at a distance of at least 4 times the head of flow from the weir.
Choose the most appropriate answer from the options given below:

• A. A, D and E only
• B. A, C and D only
• C. A, E, C and D only
• D. A, B, C and D only

Hint:

Weir installation rules:
- Weir at right angle to flow.
- Sharp crest and sides.
- Approach velocity negligible.
- Head measurement 4x upstream.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
This question tests knowledge of the rules for construction and installation of weirs for flow measurement.

Step 2: Detailed Explanation:
The correct rules for weir construction and installation are:
A. Weir should be installed in a straight line at right angle to the direction of flow: Correct.
C. Crest and sides of the edge should be sharp: Correct (for sharp-crested weirs).
D. Velocity of approach of water to the weir should be negligible: Correct.
E. The head over the weir should be measured on the upstream side at a distance of at least 4 times the head of flow: Correct.
B. Velocity of approach should be maximum: Incorrect (it should be negligible).
Thus, A, C, D, and E are correct.

Step 3: Final Answer:
Thus, the correct answer is A, C, D, and E only, which corresponds to option (C).
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