A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. Compute the hydraulic conductivity?

A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. Compute the hydraulic conductivity?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Hydraulic Conductivity

Section: Chapter Questions

Problem 6.15P

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A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. Compute the Transmissibility?
Determine the following: a) depth of water in the test well is ______ m b) Transmissbility of the impermeable layer is _____ sq.m/s c) Permeability of the aquifer is ____ m/s
Problem 8 A permeability pumping test was carried out through a confined aquifer. The aquiclude (impermeable layer) above confined aquifer has a thickness of 6.8 m from the ground surface. The water table before pumping was 2.3 m below the ground surface. The well penetrates through a confined aquifer which is 5.8 m thick. Below the confined aquifer is a solid bedrock (aquiclude). At a steady pumping rate of 26.8 m³/hr, drawdowns on two observation wells located 15 m and 30 m from the main well are 1.4 m and 0.42 m, respectively. Determine the pumping rate in GPD. 169915 174563 154256 a. A. C. 166325 b. Determine the coefficient of permeability in m/day. A. 5.89 ن ن نے C. 4.25 C. B. D. A. C. 901.4 B. D. the Determine coefficient of transmissibility in liters per hr per vertical meter of the saturated aquifer. 1056.2 B. D. 3.24 3.73 ENGR. CHRYSLER G. DUASO, CE. RMP 854.7 963.4
2. A well with a diam. of 0.6 m. is constructed in a confined aquifer as shown. The sand aquifer has a uniform thickness of 15 m. overlain by an impermeable layer with a depth of 35 m. A pumping test was conducted to determine the coefficient of permeability of the aquifer. The initial piezometric surface was 15 m. below the ground surface datum of the test well and observation wells. After water was pumped at a rate of 13 liters/sec. for several days, water levels in the wells stabilized with the following drawdowns, 6.4 m. in the test well, 3.7 m. in the observation well 10 m. from the test well and 2.4 m. in the second observation well at a distance 30 m. From these data, o Find the depth of water in the test well. • Calculate the permeability of the aquifer. O Compute the transmissibility of the impermeable layer. 71-30 Ground surface 20 15m Water Leve intern 72=10 Static water level observation wall -impermeable confined aquifer hi hr
Q4 (a) A confined stratified aquifer has a total thickness of 22 m and is made up of three layers. The bottom layer has a coefficient of permeability of 12 m/day and a thickness of 6.0 m. The middle and top layers have permeability of 14 m/day and 20 m/day respectively and are of equal thickness. Calculate the following: (i) Equivalent hydraulic conductivity (kp(eq), if the flow is perpendicular to the stratification. (ii) Equivalent hydraulic conductivity (kn(eg)), if the flow is parallel to the stratification. (ii) Ratio of equivalent hydraulic conductivities.
a) A confined stratified aquifer has a total thickness of 16 m and is made up of four layers. The bottom layer has a coefficient of permeability of 30 m/day and a thickness of 5.0 m. Above it is a layer 4 m thickness with a coefficient of permeability of 35 m/day. The third & fourth layers have a permeability of 20 m/day and 45 m/day respectively and are of equal thickness. Calculate the equivalent permeability and transmissivity if the flow is along the stratification.
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Situation 3:The water table in a certain deposit of soil is at a depth of 2m below the ground surface. The soil consists of clay up to depth of 4m from the ground and below which lies sand. The clay soil is saturated even above the water table:Clay strata: ? = 30%, ?? = 2.72Sandy Strata: ? = 26%, ?? = 2.64 1. Compute the total pressure.2. Compute the pore water pressure.3.Compute the effective stress pressure at a depth of 8m below the ground surface.
Figure 1. shows a barrier system consisting of a primary leachate collection system, a primary clay liner with a hydraulic conductivity of 10° m/s underlain by a hydraulic control (HC) layer. It is assumed that the HC layer is kept free draining without significant build-up of head in this layer. Therefore, there is no head loss between point B and C. Underneath the HC layer there is 1.5m thick natural clay (secondary clay liner) with hydraulic conductivity of 5 x 10-10 m/s and an aquifer. a) Calculate the total head at A, B & D. b) Calculate the rate of flow per unit area for the secondary liner. c) Calculate the pore water pressure in kPa at point B 1.5 m DATUM 0.2 m Leachate Collection 1.2 m Primary Liner 0.1 m -Hydraulic Control k =0.1 m's 1.5 m Secondary liner Aquifer Fig 1. Barrier system
Problrm 7.12
A silty-sand aquifer has a hydraulic conductivity of 10-4 cm/s. Two piezometers are located 300 m apart and indicate groundwater elevations of 12m and 10m above a datum. The porosity of the aquifer is 0.30. (a) What is the specific discharge in this aquifer? (b) What is the maximum velocity that a salt tracer would move in this aquifer? (c) Assuming that the aquifer is 8 m in depth, what is the discharge per meter perpendicular to the water flow?
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