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Q: Select 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.
  • A. Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
  • B. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • C. Both Assertion and Reason are false.
  • D. Assertion is true, but Reason is false.
Correct Answer: Option B - A stream channel should be design for a velocity that will neither deposit the sediment nor scour the bed and bank. This velocity is known as non-silting and non-scouring velocity. And this channel called regime channel. • If the velocity 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. This called silting and scouring velocity.
B. A stream channel should be design for a velocity that will neither deposit the sediment nor scour the bed and bank. This velocity is known as non-silting and non-scouring velocity. And this channel called regime channel. • If the velocity 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. This called silting and scouring velocity.

Explanations:

A stream channel should be design for a velocity that will neither deposit the sediment nor scour the bed and bank. This velocity is known as non-silting and non-scouring velocity. And this channel called regime channel. • If the velocity 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. This called silting and scouring velocity.