A constant-head flow experiment is set up as shown. The soil is a saturated cylindrical silty sand sample extending between Points B and D. Hydraulic conductivity of the sand is k = 1 x 10-3 cm/sec.
- Using the datum shown, calculate the elevation head he (cm), pressure head hp (cm), and total head ht (cm) at Points A, B, C, D and E. Report your answers in the table provided.
- Calculate the flow (in cm3/hr) through the silty sand assuming the diameter of the cylindrical sample is 7.5 cm.
Table below has partial answers. My main interest is points CDE. Please explain how do you derive the answers
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Homework Answers
- point 6 is directly calculated,,
- please use [ Head loss at C =37- total head at C]
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A constant-head flow experiment is set
up as shown. The soil is a saturated cylindrical silty...
Problem 3: A constant-head permeability test was performed on the soil sample shown below. The hydraulic...
Problem 3: A constant-head permeability test was performed on the soil sample shown below. The hydraulic conductivities were 0.04 cm/s for the sand and 0.0004 cm/s for the silt. The cross-sectional area of the sample is 10 cm², of which 9 cm' is sand and the remainder is silt. (a) Plot how the total hydraulic head (expressed in terms of AH) and hydraulic gradient vary along the length of the sample. (b) What would be the hydraulic conductivity (k) for...
2. A cylindrical sample of soil is confined in a rigid-wall permeameter and measures 10 cm...
2. A cylindrical sample of soil is confined in a rigid-wall permeameter and measures 10 cm in diameter and 20 cm in length. The axis of the cylindrical sample lies in a horizontal plane. They hydraulic head at the left end of the specimen is controlled by a reservoir; the water surface in the reservoir is exactly 100 cm above the horizontal axis of the cylindrical soil sample and remains at 100 cm through a system that automatically adds water...
A constant-head permeameter has a diameter of 2.5 cm. A 5.0 cm soil sample with the...
A constant-head permeameter has a diameter of 2.5 cm. A 5.0 cm soil sample with the same cross-sectional area is place in the permeameter. When a head difference of 5 cm is applied between the inlet and outlet ports, the permeameter discharges 50 cm3 of water in 90 s. (a) Calculate the hydraulic conductivity of the soil in m/s and in ft/day. (b) What is the intrinsic permeability of the soil at 20 ◦C? (c) What would be the soil’s...
The given figure below illustrates upward flow of water through a silty soil sample. The sample...
The given figure below illustrates upward flow
of water through a silty soil sample. The sample is of cylindrical
shape and, respectively, has a height and base area of 12 m and 50
cm2. Based on the provided information on the figure, what is the
effective stress at point A located in the middle of the sample (in
kN/m2)? (Note: When required, assume the unit
weight of water equal to 10 kN/m3)
Flow q-0.06 cm3/s A-50 cm2 K-0.02 cm/s ,,-20...
(1) The flow net with approximate square cells for a concrete dam is shown. The silt...
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The figure below shows the soil profile conditions below a 5-m deep pond. Water is seeping directly downward und...
The figure below shows the soil profile conditions below a 5-m deep pond. Water is seeping directly downward under steady-state conditions through the clay layer into underlying gravel. Assume the elevation datum at the top of the gravel layer and that the hydrostatic ground water table is also found in the top of the gravel and its position does not change with time or amount of flow. For these flow conditions, calculate the following: a. b. c. d. e. f....
CIVL 409 Deliverables Modules 1-3 and due Date Dr. Ghanat, PE 27.3 pts) For the flow...
CIVL 409 Deliverables Modules 1-3 and due Date Dr. Ghanat, PE 27.3 pts) For the flow net shown below, (a) compute the flow rate through soil; (bjcompute the pore water pressure at Point A, which is at elevation 122.0 m. Silty sand has a hydraulic conductivity of 8 x 101 cm/s. 20.0 m- el. 134.2 m l 1243 m el. 124.3 el. 116.0 Sałty el. 96.8 m Concrete dam and elevation (el.) points 20.0 cl 126 1 el. 1243 el....
Problem III. You are working at a construction site that has the given groundwater flow conditions....
Problem III. You are working at a construction site that has the given groundwater flow conditions. Assume that head loss cannot be neglected in either the silt or the clay layers. Determine at the interface of the silt and the clay layers: a. Total vertical stress b. Effective vertical stress C. TOTAL horizontal stress (K = 0.35) Very very permeable sand 2 ft Clay 0.5 ft Silt 2 ft S1011111 SISWA W W WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW wwwwwwwwwwwwwwwwwwwwwwwwwwwww WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW Datum Layer Hydraulic Conductivity...
*need the uplift force Problem 5 Consider the flow net shown below. The sandy soil has...
*need the uplift force
Problem 5 Consider the flow net shown below. The sandy soil has an average saturated unit weight of 20 kN/m and permeability of 0.002 cm/s. Numbers provided are elevations from the interface with the impervious layer. The other "set" of numbers counts the number of head drops. (a) Compute the distribution of pore water pressure acting along the base of the concrete weir, and determine the vertical uplift force that the water pressure exerts on the...
Contaminant sorption and flow in subsurface environment (12 points) An aquifer is contaminated du...
Contaminant sorption and flow in subsurface environment (12 points) An aquifer is contaminated due to a recent spill of a certain industrial solvent. The aquifer has a hydraulic head difference of 0.01 m as measured by two piezometers about 2 m apart along the direction of groundwater flow. The aquifer has a porosity of 0.3, organic carbon (foc) of 1.7%, soil particle density of 2.6 g/cm, and hydraulic conductivity (K) of 2.5 x 10-3 cm/sec The solvent has a log...
Problem 3: A constant-head permeability test was performed on the soil sample shown below. The hydraulic conductivities were 0.04 cm/s for the sand and 0.0004 cm/s for the silt. The cross-sectional area of the sample is 10 cm², of which 9 cm' is sand and the remainder is silt. (a) Plot how the total hydraulic head (expressed in terms of AH) and hydraulic gradient vary along the length of the sample. (b) What would be the hydraulic conductivity (k) for...
The given figure below illustrates upward flow
of water through a silty soil sample. The sample is of cylindrical
shape and, respectively, has a height and base area of 12 m and 50
cm2. Based on the provided information on the figure, what is the
effective stress at point A located in the middle of the sample (in
kN/m2)? (Note: When required, assume the unit
weight of water equal to 10 kN/m3)
Flow q-0.06 cm3/s A-50 cm2 K-0.02 cm/s ,,-20...
(1) The flow net with approximate square cells for a concrete dam is shown. The silt has a hydraulic conductivity of 0.2 ft hr. (a) What is the approximately seepage rate (ft/hr/ft)? (b) What are the total head (hr), elevation head (he), and pressure head (h) at points A and B h e (ft) he (ft) hrift) Point A (2) The flow net with approximate square cells for a single sheet pile is shown as below. The hydraulic conductivity of...
The figure below shows the soil profile conditions below a 5-m deep pond. Water is seeping directly downward under steady-state conditions through the clay layer into underlying gravel. Assume the elevation datum at the top of the gravel layer and that the hydrostatic ground water table is also found in the top of the gravel and its position does not change with time or amount of flow. For these flow conditions, calculate the following: a. b. c. d. e. f....
CIVL 409 Deliverables Modules 1-3 and due Date Dr. Ghanat, PE 27.3 pts) For the flow net shown below, (a) compute the flow rate through soil; (bjcompute the pore water pressure at Point A, which is at elevation 122.0 m. Silty sand has a hydraulic conductivity of 8 x 101 cm/s. 20.0 m- el. 134.2 m l 1243 m el. 124.3 el. 116.0 Sałty el. 96.8 m Concrete dam and elevation (el.) points 20.0 cl 126 1 el. 1243 el....
Problem III. You are working at a construction site that has the given groundwater flow conditions. Assume that head loss cannot be neglected in either the silt or the clay layers. Determine at the interface of the silt and the clay layers: a. Total vertical stress b. Effective vertical stress C. TOTAL horizontal stress (K = 0.35) Very very permeable sand 2 ft Clay 0.5 ft Silt 2 ft S1011111 SISWA W W WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW wwwwwwwwwwwwwwwwwwwwwwwwwwwww WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW Datum Layer Hydraulic Conductivity...
*need the uplift force
Problem 5 Consider the flow net shown below. The sandy soil has an average saturated unit weight of 20 kN/m and permeability of 0.002 cm/s. Numbers provided are elevations from the interface with the impervious layer. The other "set" of numbers counts the number of head drops. (a) Compute the distribution of pore water pressure acting along the base of the concrete weir, and determine the vertical uplift force that the water pressure exerts on the...
Contaminant sorption and flow in subsurface environment (12 points) An aquifer is contaminated due to a recent spill of a certain industrial solvent. The aquifer has a hydraulic head difference of 0.01 m as measured by two piezometers about 2 m apart along the direction of groundwater flow. The aquifer has a porosity of 0.3, organic carbon (foc) of 1.7%, soil particle density of 2.6 g/cm, and hydraulic conductivity (K) of 2.5 x 10-3 cm/sec The solvent has a log...
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