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
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
Ditch
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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- Figure 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_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_forward3 Seepage is occurring through the sandy layer underneath the concrete dam as shown in Figure 7.30. Concrete dam H₁ Seepage H₂ H₂ Sandy layer Impervious rock PXSXX2X L Figure 7.30 Given: upstream water level, H₁ = 16 m; downstream water level, H₂ = 2.3 m; thickness of the sandy layer, H, = 0.75 m; hydraulic conductivity of the sandy layer, k = 0.009 cm/sec; void ratio of sand, e = 0.8; and L = 45 m. Determine: a. Rate of seepage per unit length of the dam (in m³/hr/m) b. Seepage velocity c. Quantity of seepage per day if the dam is 350 m longarrow_forward
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