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In an assumption made in the Bligh's Creep Theory for design of impervious floor for sub surface flow, the hydraulic gradient
- a)increases throughout the impervious length of the apron
- b)decreases from upstream side to downstream side of the structure
- c)is always zero only in the middle of the impervious length of the apron
- d)is constant throughout the impervious length of the apron
Correct answer is option 'D'. Can you explain this answer?
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In an assumption made in the Blighs Creep Theory for design of impervi...
Bligh's Creep Theory for design of impervious floor for sub surface flow assumes that the hydraulic gradient is constant throughout the impervious length of the apron. This means that the gradient does not change from upstream to downstream side of the structure.
Explanation:
Bligh's Creep Theory is used for designing impervious floors for sub surface flow, such as in canals, weirs, and spillways. According to this theory, the hydraulic gradient is assumed to be constant throughout the impervious length of the apron.
The hydraulic gradient is the slope of the water surface in the direction of flow. In other words, it is the change in hydraulic head per unit length of flow. The hydraulic gradient can be calculated using the following formula:
i = (h2 - h1) / L
Where i is the hydraulic gradient, h2 is the hydraulic head at the downstream end of the impervious length, h1 is the hydraulic head at the upstream end of the impervious length, and L is the length of the impervious floor.
Bligh's Creep Theory assumes that the hydraulic gradient is constant throughout the impervious length of the apron. This means that the hydraulic head remains constant along the impervious length, and there is no change in the slope of the water surface. As a result, the hydraulic gradient is the same at all points along the impervious floor.
Conclusion:
In conclusion, Bligh's Creep Theory for design of impervious floor for sub surface flow assumes that the hydraulic gradient is constant throughout the impervious length of the apron. This assumption simplifies the design process and makes it easier to determine the required thickness and strength of the impervious floor.
Explanation:
Bligh's Creep Theory is used for designing impervious floors for sub surface flow, such as in canals, weirs, and spillways. According to this theory, the hydraulic gradient is assumed to be constant throughout the impervious length of the apron.
The hydraulic gradient is the slope of the water surface in the direction of flow. In other words, it is the change in hydraulic head per unit length of flow. The hydraulic gradient can be calculated using the following formula:
i = (h2 - h1) / L
Where i is the hydraulic gradient, h2 is the hydraulic head at the downstream end of the impervious length, h1 is the hydraulic head at the upstream end of the impervious length, and L is the length of the impervious floor.
Bligh's Creep Theory assumes that the hydraulic gradient is constant throughout the impervious length of the apron. This means that the hydraulic head remains constant along the impervious length, and there is no change in the slope of the water surface. As a result, the hydraulic gradient is the same at all points along the impervious floor.
Conclusion:
In conclusion, Bligh's Creep Theory for design of impervious floor for sub surface flow assumes that the hydraulic gradient is constant throughout the impervious length of the apron. This assumption simplifies the design process and makes it easier to determine the required thickness and strength of the impervious floor.
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In an assumption made in the Blighs Creep Theory for design of impervi...
Bligh’s Creep Theory:
- Bligh assumed that the percolating water follows the outline of the base of the structure which is in contact with the subsoil.
- The length of the path traversed by the percolating water is called the length of creep or creep length.
- He further assumed that the head loss per unit length of creep (i.e. H/L) which is called hydraulic gradient is constant throughout the percolating passage i.e. Loss of head is proportional to length of the creep.
Hydraulic Gradient (i) = 
The reciprocal of hydraulic gradient (i.e. L/H) is known as Bligh’s Coefficient of creep.
Additional Information
Percolation Coefficient:
It is defined as the ratio of coefficient of permeability to porosity of soil.
Where,
K = co-efficient of Permeability
η = Porosity.
The reciprocal of hydraulic gradient (i.e. L/H) is known as Bligh’s Coefficient of creep.
Additional Information
Percolation Coefficient:
It is defined as the ratio of coefficient of permeability to porosity of soil.
Where,
K = co-efficient of Permeability
η = Porosity.
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In an assumption made in the Blighs Creep Theory for design of impervious floor for sub surface flow, the hydraulic gradienta)increases throughout the impervious length of the apronb)decreases from upstream side to downstream side of the structurec)is always zero only in the middle of the impervious length of the aprond)is constant throughout the impervious length of the apronCorrect answer is option 'D'. Can you explain this answer?
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In an assumption made in the Blighs Creep Theory for design of impervious floor for sub surface flow, the hydraulic gradienta)increases throughout the impervious length of the apronb)decreases from upstream side to downstream side of the structurec)is always zero only in the middle of the impervious length of the aprond)is constant throughout the impervious length of the apronCorrect answer is option 'D'. 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 In an assumption made in the Blighs Creep Theory for design of impervious floor for sub surface flow, the hydraulic gradienta)increases throughout the impervious length of the apronb)decreases from upstream side to downstream side of the structurec)is always zero only in the middle of the impervious length of the aprond)is constant throughout the impervious length of the apronCorrect answer is option 'D'. 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 In an assumption made in the Blighs Creep Theory for design of impervious floor for sub surface flow, the hydraulic gradienta)increases throughout the impervious length of the apronb)decreases from upstream side to downstream side of the structurec)is always zero only in the middle of the impervious length of the aprond)is constant throughout the impervious length of the apronCorrect answer is option 'D'. Can you explain this answer?.
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