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According to Lacey, depth of scour in a river depends upon the straightness of the reach. If 'D' is the depth of scour in regime flow in a right angled bend, then it is equal to
  • a)
    1.25 D
  • b)
    2.00 D
  • c)
    1.75 D
  • d)
    1.50 D
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
According to Lacey, depth of scour in a river depends upon the straigh...
In India, Lacey (1930) and Neill (5) (1973) have proposed coefficients (Ybs/R) for different types of Channels as given in Table. Ybs is the maximum scoured flow depth and R is the hydraulic mean depth measured below HFL.
Effect of bend on maximum flow depth (Ybs)
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According to Lacey, depth of scour in a river depends upon the straigh...
Explanation:

Depth of scour in a river bend:
- In a river bend, the depth of scour (D) in regime flow can be calculated based on the straightness of the reach.
- According to Lacey, if D is the depth of scour in a right-angled bend, it is equal to 2.00 D.

Lacey's equation:
- Lacey's equation states that the depth of scour in a river bend is directly proportional to the straightness of the reach.
- In a right-angled bend, the depth of scour is 2.00 times the scour depth in regime flow.

Calculation:
- If D is the depth of scour in regime flow in a right-angled bend, then the depth of scour in the bend would be 2.00 D.
- Therefore, the correct answer is option 'B' - 2.00 D.

Conclusion:
- The depth of scour in a river bend is influenced by the straightness of the reach, as explained by Lacey's equation.
- Understanding this relationship is crucial in determining the potential scour depth in river bends and designing effective erosion control measures.
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According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, then it is equal toa)1.25 Db)2.00 Dc)1.75 Dd)1.50 DCorrect answer is option 'B'. Can you explain this answer?
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According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, then it is equal toa)1.25 Db)2.00 Dc)1.75 Dd)1.50 DCorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, then it is equal toa)1.25 Db)2.00 Dc)1.75 Dd)1.50 DCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, then it is equal toa)1.25 Db)2.00 Dc)1.75 Dd)1.50 DCorrect answer is option 'B'. Can you explain this answer?.
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