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 Sand

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 Sand

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.4P

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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 Ditch
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
2.8 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.
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 cu.m/min. * O (3 Points) w.s. El.=160 Levee Impervious layer' 10 m w.s. El.=150 2 m Sand Ditch Impervious layer 125 m O 240 cu.m/min O 0.166 cu.m/min O 288 cu.m/min
From 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. 14
7.7 A sand layer of the cross-sectional area shown in Fig. 7.27 has been determined to exist for a 800-m length of the levee. The hydraulic conductivity of the sand layer is 2.8 m/day. Determine the quantity of water which flows into the ditch in m'/min. Elv. 160 m Levee Elv. 145 m 1.6 m Ditch 180 m Impervious Sand
Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/min
A loam layer having the cross-section area as shown in the figure has been determined to exist for a 350-meter length of levee. The coefficient of permeability of the sand layer is 0.1810m/s. Determine the flow of water in cubic meters per seconds from point A to point B if point A is in 290m height from the datum and point B is in 200m height from the datum. The loam layer is having 150 meters in length and 1.50 meters in thickness. Send Sean
A loam layer having the cross-section area as shown in the figure has been determined to exist for a 350-meter length of levee. The coefficient of permeability of the sand layer is 0.1810m/s. Determine the flow of water in cubic meters per seconds from point A to point B if point A is in 290m height from the datum and point B is in 200m height from the datum. The loam layer is having 150 meters in length and 1.50 meters in thickness.
A 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.
2. A confined aquifer is recharged by a continuous supply of water from the certain source. The average thickness of the aquifer was determined to be 25 m and the average width is 4 km. The hydraulic conductivity of the aquifer was obtained at 40 m/day and its void ratio is 0.3333. The piezometer heads in two wells 1.325 km apart are 65 meters and 60 meters from a common reference datum. Determine the rate of flow in cubic meters per day. Determine: •compute the rate of flow through the aquifer in m3/day •compute the seepage velocity in m/day •compute the time of travel from the head of the aquifer to a point 8 km downstream in days
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 1.12