Subject: Hydrology/ Hydraulics Question 1:* Two observation wells have been constructed in the formation shown. The flow rate is 0.01 cu. m/hr perunit width of the formation.o Compute the hydraulic gradiento Compute the equivalent hydraulic conductivityCompute the value of k2.* Note: Since the soil is layered differently compared to the given figure above. Check FAQ's.5m2.5m20mKj=15 m/dayK2=?K3=10 mkday300m600m400m-1300m

Given data Rate of Flow(Q) = 0.01 m3/ hr = 0.24 m3/day Height of water in well 1(H1) = 5 m Height…

Answered: * Two observation wells have been…

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter9: In Situ Stresses

Section: Chapter Questions

Problem 9.6P

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1. Calculate the equivalent hydraulic conductivity for the soil profile shown in figure 2. An excavation is proposed for a square area near the bend of a river, as shown in figure. It is expected that the flow of water into the excavation will come through the silt layer. Pumping test reveal an average horizontal hydraulic conductivity of 2 x 10 -5 cm/s in the silt layer. The excavation has to be kept dry. Determine the flow (qs) into the excavation.
Two observation wells have been constructed in the formation shown. The flow rate is 0.01 m3/hr per unit width of the formation. 1. Compute the hydraulic gradient. 2. Compute the equivalent hydraulic conductivity. 3. Compute the value of K2.
L = 370 mm A = 145 cm^2 h = 340 mm Water collected in 3 min Q = 580 cm^3 Void ratio of sand e= 0.66 Determine the Hydraulic conductivity and seepage velocity.
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 sand has Gs = 2.66. Calculate the hydraulic gradient that will cause boiling for e = 0.35, 0.45, 0.55, 0.7, and 0.8.
From the figure shown, H1 = 0.60, H2 = 0.90 m. and h = 0.45 m. The sad has a saturated unit weight of 18.65 kN/m3 . Hydraulic conductivity of sand K = 0.12 cm/sec. If the cross sectional area of tank = 0.46 m2 , determine the following: 1. Total stress and Effective stress at C. 2. Pore water pressure at C. 3. Rate of upward seepage of water in liters/sec.
Illustrated laboratory setup includes a column of homogenous soil with a square cross-section area of 25 cm2. A constant head difference is applied for the setup. Assume continuous, steady-state flow in a fully saturated medium, and all head loss occurs in the soil. Points A, B, and C are located as shown in the figure. The saturated unit weight of sand is 18 kN/m3. a) Determine the elevation, pressure and total head at Points A and B.b) Determine the hydraulic gradient.c) Determine the total amount of flow per minute if k = 10 cm/mind) Show the direction and calculate the seepage force acting on plane x-x.e) Calculate the effective stress along the plane parallel to the direction of flow assuming that the total stress along that direction is 25 kPa at Point C.
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)
Refer to the figure. If H1 = 1.94 m, H2 = 2.37 m, h = 1.c m, e =0.49, Gs = 2.67,area of the tank = 0.64 m2, and hydraulic conductivity of the sand (k) = 0.3d cm/sec. What is the upward seepage force per unit volume of soil?
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.
An unconfined aquifer exists where a buried river channel cut into underlying impermeable bedrock. The figure below shows the orientation and pertinent dimensions. The flow rate at the pumping well is 250 gpm, and its radius of influence is 1000 ft. The hydraulic conductivity of the aquifer is 15 ft/d, and the initial saturated thickness is 120 ft. Find the drawdown at the observation well under equilibrium conditions.
At n = 0.45, the hydraulic conductivity of the sand is 0.010 cm/sec. Determine the hydraulic conductivity at n = 0.50.

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