Question
Download Solution PDFSelect the option that is appropriate regarding the following two statements labelled Assertion and Reason.
Assertion: A channel should be designed for a velocity that will neither deposit the sediment nor scour the bed and banks. This velocity is known as non-scouring and non silting velocity.
Reason: If the velocity of flow is too low, the sediment held in suspension will settle down; whereas, if the velocity is too high, the water will scour the bed and sides of the canal.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
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Assertion: A channel should be designed for a velocity that will neither deposit the sediment nor scour the bed and banks. This is indeed true because such a design ensures the stability of the channel by preventing sediment accumulation (silting) or erosion (scouring). This ideal velocity is referred to as the non-scouring and non-silting velocity.
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Reason: If the velocity of flow is too low, the sediment held in suspension will settle down, causing silting. On the other hand, if the velocity is too high, it can lead to the scouring of the bed and sides of the canal. This statement accurately explains why the channel's velocity needs to be balanced to prevent both silting and scouring.
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