Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Consider the following statements:Phreatic li...
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Consider the following statements:
Phreatic line in an earth dam is
1. elliptical in shape
2. an equipotential line
3. the topmost flow line with zero waterpressure
4. approximately a parabola
Which of these statements is/are correct ?
- a)1, 2 and 3
- b)2, 3 and 4
- c)3 and 4
- d)1 alone
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Consider the following statements:Phreatic line in an earth dam is1. e...
The correct option is C 3 and 4
Phreatic line is the top flow line which separates saturated zone from unsaturated zone and below which positive hydrostatic pressure exists in the dam section. Along the phreatic line, the atmospheric pressure exists. It's shape is approximately of a parabola.
Most Upvoted Answer
Consider the following statements:Phreatic line in an earth dam is1. e...
The correct answer is option 'C' - Statements 3 and 4.
Phreatic line in an earth dam is:
1. Not elliptical in shape
2. An equipotential line
3. The topmost flow line with zero water pressure
4. Approximately a parabola
Let's discuss each statement in detail:
1. Not elliptical in shape: The phreatic line in an earth dam is not elliptical in shape. The phreatic line represents the surface of the groundwater and is generally curved. It follows the path of least resistance and is influenced by various factors such as the geometry of the dam, seepage conditions, and the properties of the surrounding soil.
2. An equipotential line: The phreatic line is an equipotential line, meaning that all points on the line have the same hydraulic head or water pressure. This is because the water in the phreatic zone is at equilibrium and there is no flow or pressure difference along the line.
3. The topmost flow line with zero water pressure: The phreatic line represents the topmost flow line in an earth dam. It is the boundary between the saturated and unsaturated zones. Above the phreatic line, the soil is unsaturated and below the line, the soil is saturated. The phreatic line is also called the groundwater table or the water table. At the phreatic line, the water pressure is zero.
4. Approximately a parabola: The shape of the phreatic line in an earth dam can be approximated as a parabola. This approximation is based on the assumption that the seepage flow is two-dimensional and the soil properties are homogeneous. In reality, the shape of the phreatic line can be influenced by various factors such as seepage conditions, slope stability, and the presence of impermeable layers.
To summarize, the correct statements about the phreatic line in an earth dam are:
- The phreatic line is an equipotential line.
- The phreatic line represents the topmost flow line with zero water pressure.
Phreatic line in an earth dam is:
1. Not elliptical in shape
2. An equipotential line
3. The topmost flow line with zero water pressure
4. Approximately a parabola
Let's discuss each statement in detail:
1. Not elliptical in shape: The phreatic line in an earth dam is not elliptical in shape. The phreatic line represents the surface of the groundwater and is generally curved. It follows the path of least resistance and is influenced by various factors such as the geometry of the dam, seepage conditions, and the properties of the surrounding soil.
2. An equipotential line: The phreatic line is an equipotential line, meaning that all points on the line have the same hydraulic head or water pressure. This is because the water in the phreatic zone is at equilibrium and there is no flow or pressure difference along the line.
3. The topmost flow line with zero water pressure: The phreatic line represents the topmost flow line in an earth dam. It is the boundary between the saturated and unsaturated zones. Above the phreatic line, the soil is unsaturated and below the line, the soil is saturated. The phreatic line is also called the groundwater table or the water table. At the phreatic line, the water pressure is zero.
4. Approximately a parabola: The shape of the phreatic line in an earth dam can be approximated as a parabola. This approximation is based on the assumption that the seepage flow is two-dimensional and the soil properties are homogeneous. In reality, the shape of the phreatic line can be influenced by various factors such as seepage conditions, slope stability, and the presence of impermeable layers.
To summarize, the correct statements about the phreatic line in an earth dam are:
- The phreatic line is an equipotential line.
- The phreatic line represents the topmost flow line with zero water pressure.
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Consider the following statements:Phreatic line in an earth dam is1. elliptical in shape2. an equipotential line3. the topmost flow line with zero waterpressure4. approximately a parabolaWhich of these statements is/are correct ?a)1, 2 and 3b)2, 3 and 4c)3 and 4d)1 aloneCorrect answer is option 'C'. Can you explain this answer?
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