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

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Water flows through a fully confined sand aquifer with a piezometric head gradient of 0.025.(a) If the hydraulic conductivity and effective porosity of the aquifer are 1.72 m/d and 0.45, respectively, estimate the specific discharge and seepage velocity in the aquifer.(b) estimate the volumetric flow rate of the groundwater if the aquifer is 45 m deep and 1.2 km wide.(c) How long does it take a dissolved contaminant in the groundwater to move 1 km?
b. An aquifer with a potentiometric surface is 50 m thick and 500 m wide. Two observation wells are located 1400 m apart in the direction of flow. Head in the first well is 50m and in the second well is 42m. Hydraulic conductivity is 0.7 m/d. Effective porosity of the medium is 20%. Determine the total flow of the water through the aquifer. Also determine the actual groundwater velocity between the two wells.
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
From the figure shows an unconfined non homogeneous aquifer between two water bodies at depth of 50 m and 45 m. respectively. Compute the average coefficient of permeability of the aquifer and the rate of flow.
Refer to the cross section of the earth dam shown below. Calculate the rate of seepage through the dam (q in m/min/m) using Schaffernak's and Casagrande's solutions. +7 m→| 3 m G.W.T. 1 32 m 2.0 2.0 Impermeable layer
The following data are for a falling-head permeability test:• Length of the soil sample = 150 mm• Area of soil sample = 1964 mm^2• Area of the standpipe = 25 mm^2• At time t = 0, head difference = 400 mm• At time t = 8 min, head difference = 200 mma. Determine the hydraulic conductivity of the soil (cm/sec). (ans. 2.75x10^-4 cm/s)b. What was the head difference at t = 6 min? (ans. 23.82cm)
Q 1 .An aquifer has following different formations, their thickness and Hydraulic conductivity are given below. Assume that each formation is isotropic and homogeneous. Compute both the equivalent horizontal and vertical hydraulic conductivities Formation Thickness (m) Hydraulic Conductivity ( m/day) 1 24 2 8. 12 3 15 4 9 5 6 10 10 8 20 1 10 10 18 11 8. 29 12 29 13 6. 14 3. 16 15 10 26 16 4 9. 17 4. 18 4. 1 19 29 20 25 21 8 12 22 4 23 23 18 24 7. 30 25 8 29 26 6. 28 27 28 28 9. 14 29 4 14 30 2 31 8. 4 32 1 33 3. 19 34 2 13
A confined aquifer shown has hydraulic conductivity of 52 m/day with void ratio of 0.282. The average thickness is 30 m and the average width is 4 km. el = 85 m el = 55 m 30 m aquifer 1400 m Determine the nearest value of the time of travel from the head of aquifer to a point 5.2 km downstream in days (in a whole day).
Answer in three decimal places please
A confined aquifer has a source of recharge. The hydraulic conductivity of the aquifer is 40 m/day and its porosity is 0.25. The piezometric head in the two wells 1000m apart is 65 m and 60 m respectively from a common data. The average thickness of the aquifer is 25 m and the average width is 4 km. Compute the seepage velocity.
Given the coefficient k =0.05 m/s and porosity p = 48%, find thetransmissibility (T) in m/s per unit m, if the aquifer width is 1.2 m.Formula: - It is the flow rate per day thru a unit areaunder a unit hydraulic gradient For an aquifer with thickness, Band width, X:T = K*B and Ag = BXThus: Q = (T*X*S)