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If D is the depth of scour below original bed, then the width of launching apron is generally taken as:
- a)1.5 D
- b)2.5 D
- c)1.2 D
- d)2.0 D
Correct answer is option 'A'. Can you explain this answer?
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If D is the depth of scour below original bed, then the width of launc...
Heavy scour of the river bed at curved heads and shanks of guide banks can cause undermining of stone pitching thereby resulting in failure of guide banks. Such a failure can be prevented by providing launching apron beyond the toe of guide banks. The width of launching apron is generally taken as 1.5D.
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If D is the depth of scour below original bed, then the width of launc...
Explanation:
Launching apron is the concrete apron constructed upstream of the dam to protect it from scouring. The width of the launching apron is an important design parameter and it depends on the depth of scour below the original bed.
The generally accepted formula to calculate the width of the launching apron is given by:
Width of launching apron = 1.5 times the depth of scour below original bed
This means that if the scour depth below the original bed is D, then the width of the launching apron should be 1.5D.
Reasons for selecting 1.5D as the width of launching apron:
There are several reasons why 1.5D is selected as the width of the launching apron. Some of them are:
1. To ensure stability: The launching apron should be wide enough to ensure the stability of the dam. If the width is too small, it may not be able to withstand the force of the flowing water, which can lead to the failure of the dam.
2. To prevent scouring: The purpose of the launching apron is to protect the dam from scouring. If the width is too small, it may not be able to prevent scouring, which can lead to the failure of the dam.
3. To provide a stable foundation: The launching apron should provide a stable foundation for the dam. If the width is too small, it may not be able to provide a stable foundation, which can lead to the failure of the dam.
Conclusion:
In conclusion, the width of the launching apron is an important design parameter for the stability and safety of the dam. The generally accepted formula to calculate the width of the launching apron is 1.5 times the depth of scour below original bed.
Launching apron is the concrete apron constructed upstream of the dam to protect it from scouring. The width of the launching apron is an important design parameter and it depends on the depth of scour below the original bed.
The generally accepted formula to calculate the width of the launching apron is given by:
Width of launching apron = 1.5 times the depth of scour below original bed
This means that if the scour depth below the original bed is D, then the width of the launching apron should be 1.5D.
Reasons for selecting 1.5D as the width of launching apron:
There are several reasons why 1.5D is selected as the width of the launching apron. Some of them are:
1. To ensure stability: The launching apron should be wide enough to ensure the stability of the dam. If the width is too small, it may not be able to withstand the force of the flowing water, which can lead to the failure of the dam.
2. To prevent scouring: The purpose of the launching apron is to protect the dam from scouring. If the width is too small, it may not be able to prevent scouring, which can lead to the failure of the dam.
3. To provide a stable foundation: The launching apron should provide a stable foundation for the dam. If the width is too small, it may not be able to provide a stable foundation, which can lead to the failure of the dam.
Conclusion:
In conclusion, the width of the launching apron is an important design parameter for the stability and safety of the dam. The generally accepted formula to calculate the width of the launching apron is 1.5 times the depth of scour below original bed.
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If D is the depth of scour below original bed, then the width of launching apron is generally taken as:a)1.5 Db)2.5 Dc)1.2 Dd)2.0 DCorrect answer is option 'A'. Can you explain this answer?
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