Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 7, Problem 7.10P
To determine
Find the hydraulic conductivity of the sand layer.
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7.10 Figure 7.32 shows the cross section of a levee which is 650 m long and is
underlain by a 2.5-m-thick permeable sand layer. It was observed that the
quantity of water flowing through the sand layer into the collection ditch is
13.5 m³/hr. What is the hydraulic conductivity of the sand layer?
Elv. 175 m
Elv. 158 m.
2.5 m
Ditch
210 m
Impervious
Figure 7.32
Sand
5.4 The figure shows the cross-section of a levee that is 500 m long and is
underlain by a 2-m-thick permeable sand layer. It was observed that the
quantity of water flowing through the sand layer into the collection ditch is
250 m³/day. What is the hydraulic conductivity of the sand layer.
Ans. k = 3.125 m/day
Elv. 160 m
Levee
Elv. 150 m
2 m
Ditch
125 m
Impervious
Sand
the cross section of a levee, shown below, which is 650 m long and is underlain by a 2.5-m-thick permeable sand layer. It was observed that the quantity of water flowing through the sand layer into the collection ditch is 13.5 m3 /hr. What is the hydraulic conductivity of the sand layer?
Chapter 7 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 7 - Prob. 7.1PCh. 7 - Prob. 7.2PCh. 7 - Prob. 7.3PCh. 7 - Prob. 7.4PCh. 7 - Prob. 7.5PCh. 7 - Prob. 7.6PCh. 7 - Prob. 7.7PCh. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - Prob. 7.10P
Ch. 7 - Prob. 7.11PCh. 7 - Prob. 7.12PCh. 7 - Prob. 7.13PCh. 7 - Prob. 7.14PCh. 7 - Prob. 7.15PCh. 7 - Prob. 7.16PCh. 7 - Prob. 7.17PCh. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20PCh. 7 - Prob. 7.21PCh. 7 - Refer to Figure 7.24. The following data were...Ch. 7 - Prob. 7.23PCh. 7 - Prob. 7.1CTP
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- Problem 3 A sand layer of the cross-sectional area shown in the figure has been determined to exist for a 500 m. length of the levee. The hydraulic conductivity of the sand layer is 3 m/day. Determine the quantity of water which flows into the ditch in m³/min. W.S. EL=160 Levee Impervious ·layer' W.S. El.=150 Sand Impervious layer 125 m 10 m 2 m Ditcharrow_forward2.8 A 500 m long levee made of compacted clay impounds water in a reservoir as shown in Figure P2.8. There is a 1 m thick (measured in the direction perpendicular to the seam) sand seam continuing along the entire length of the levee, at 10° inclination to the horizontal, which connects the reser- voir and the ditch. The hydraulic conductivity of the sand is 2.6 × 10-³ cm/s. Determine the volume of water that flows into the ditch every day.arrow_forwardAnswer question 5arrow_forward
- Consider the hydraulic structure shown in the figure below. In the flow net for flow through the permeable layer, the number of flow channels is Nf = 5 and the number of potential drops is Ng = 12 Calculate the seepage loss. 25 m 10 m 1.67 m 3.34 m 20 m k = 0.002 cm/sec 1.67 m 1.67 m Permeable layer | Impermeable layer Select the correct response: 7.21 m3/day/m O 2.17 m/day/m 6.28 m3/day/m O 6.82 m/day/m 11arrow_forwardA pump well is dug through a confined aquifer having a thickness of 32 meters. The piezometric surface of the aquifer is 18 meters measured from the top impermeable layer. The first observation well is 75 feet directly west of the pump well and the second observation well is 75 feet directly north of the first observation well. Determine the hydraulic conductivity of the aquifer if it supplies a discharge of 10 liters per second and the drawdown of the observation wells are 13 feet and 23 feet.arrow_forwardThe figure shows the cross section of a levee that is 500 m long and is underlain by a 2-m-thick permeable sand layer. It was observed that the quantity of water flowing through the sand layer into the collection ditch is 250 m³/day. What is the hydraulic conductivity of the sand layer? Elv. 160 m Levee 1 Elv. 150 m 2 m Ditch 125 m I Impervious O Sandarrow_forward
- P3. 3. Please give the solution and the correct answer.arrow_forwardThe figure below represents a system with flow in the horizontal direction. Find the value of each pressure charge, level charge, and total charge in A, B, C, D, E, F, G, plus the real and approximate velocity of water flow plotting all of the above, given that soil porosity = 0.33 and transmittance coefficient = 0.50 cm/secarrow_forwardFigure 1.11 Practice Problem 2: Refer to Figure 1.12. If Hi = 1.5 m, H2 = 2.5 m, h = 1.5 m, e =0.49, Gs = 2.66, area of the tank = 0.62 m², and hydraulic conductivity of the sand (k) = 0.21 cm/sec. a. What is the rate of upward seepage of water (m³/min)? b. Will boiling occur when h = 1.5 m? c. What would be the critical value of h to cause boiling? %3D %3D %3D 南) H H2 Valve (open) Inflow Figure 1.12arrow_forward
- 4. A 500-m long levee made of compacted clay impounds water in a reservoir as shown in Figure 3. A sandy-silt seam of average thickness 1.0 m (measured in the direction in the vertical direction) cuts across the otherwise impermeable clay. The average hydraulic conductivity of the sandy-silt seam is 1.5 ×10-5 cm/sec. Determine the volume of water that flows into the ditch every day. EL. 38 m Levee Reservoir (Compacted clay) EL: 32 m EL: 30 m Sand seam 1.m EL: 26m Ditch EL: 24m Clay 50 m (Not to scale)arrow_forwardFrom the figure shown, the thickness of permeable layer is 1.1m making an angle of 14 degrees with the horizontal. K= 4.87x10^-12 cm/sec. If the vertical thickness depth of the aquifer at point of the first piezometer (left) is 1.5m and the other point at second piezometer is 1.1m, determine the flow rate. h=1.4 m Direction impervious layer of seepage 3 m 14 1.1 m impervious layer L. 14arrow_forwardA dam section is shown in Figure 8.11a. The hydraulic conductivity of the permeable layer in the vertical and horizontal directions are 2.9×10^-2 mm/sand 4.6 ×10^−2 mm/s, respectively. Calculate the seepage loss of the dam in ft^3/day/ftarrow_forward
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