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If a gauging section is having shifting control due to backwater effects, then
  • a)
    a loop rating curve results
  • b)
    the section is useless for stream-gauging purposes
  • c)
    the discharge is determined by area-velocity methods
  • d)
    a secondary gauge downstream of the section is needed
Correct answer is option 'D'. Can you explain this answer?
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If a gauging section is having shifting control due to backwater effec...
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If a gauging section is having shifting control due to backwater effec...
Explanation:

Backwater effects occur when there is a blockage or constriction in the flow of a stream or river, causing the water to back up and affect the gauging section. This can cause the control of the gauging section to shift, making it difficult to accurately measure the flow rate of the water.

To address this issue, a secondary gauge downstream of the gauging section is needed. This gauge can help to measure the flow rate of the water after it has passed through the affected section, providing a more accurate reading of the water's flow rate.

Therefore, option D is the correct answer.
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