Which of the following factors have to be considered in selecting a site for a stream gauging station?
- AThe section should be straight and uniform for a length of about 10 to 20 times the width of the stream.
- BThe bed and banks should be free from vegetal growth
- CThere should be no longer overflow section at flood stage.
- DAll of the aboveCorrect
Solution
Concept
Site selection criteria for stream gauging
Formula
NONE
Step-by-step solution
1. A stream gauging station requires a straight and uniform channel section to maintain stable flow conditions. 2. The bed and banks must be free from vegetation to ensure consistent cross-sectional geometry. 3. The channel should contain all flood flows within its banks without uncontrolled overbank spilling. 4. Hence, all of the listed factors must be considered when selecting a site. Answer: D
Explanation
Selecting an ideal stream gauging site requires a straight and uniform channel to maintain smooth, parallel flow lines. Eliminating bank vegetation and overflow sections prevents flow disturbance and ensures accurate discharge measurement during all stage levels. Therefore, all listed conditions must be met for proper stream gauging.
Why the other options are wrong
A) Option A is a valid site selection requirement but not the only one. B) Option B is a valid requirement but does not cover all necessary selection criteria alone. C) Option C is a valid selection criterion, making option D the comprehensive correct choice.
Shortcut
Ideal gauging needs straight reach, clear banks, and no flood overflow (All of the above).
Common mistake
Selecting a single site selection criterion without recognizing that all listed factors are required.
Correct answer: D) All of the above