Weed growth in a canal invariably leads to-
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A.
Reduction in discharge
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B.
Reduction in silting
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C.
Increase in velocity of flow
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D.
Increase in discharge
Correct Answer:
A. Reduction in discharge
Explanation:
The presence of weeds in a canal increases the roughness of the channel bed and sides, which creates greater resistance to the water's movement. This friction reduces the velocity of the flow, and since the discharge of a canal is directly proportional to the velocity, the overall volume of water passing through the section decreases. Consequently, weed growth invariably leads to a reduction in discharge.
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