?? Q.11.19A field pumping test was conducted from an aquifer of sandy soil of 4 m thickness confinedbetween two impervious strata. When equilibrium was established, 90 liters of water was pumpedObservation wellsAp-ImeTest well7, = 6 mImpermeable stratum= 3 mhz = 2.7 mh, = 2.1 mHo = 4 mConfined aquiferImpermeableManCEi. DeKKER, INC.270 Mudison Avenue, New York. New York 10016out per hour. The water elevation in an observation well 3.0 m away from the test well was 2.1 mand another 6.0 m away was 2.7 m from the roof level of the impervious stratum of the aquifer. Findthe value of k of the soil in m/sec. (Copyright © Marcel Dekker, Inc. All rights reserved.

Answered: Image /qna-images/answer/cb7ff874-84b4-4f04-b90a-38bfce5dac91.jpg

Q.11.19 A field pumping test was conducted from an aquifer of sandy soil of 4 m thickness confined between two impervious strata. When equilibrium was established, 90 liters of water was pumped Observation wells Ap Test well Imet 7, = 6 m Impermeable stratum , = 3 m h, = 2.7 m h, = 2.1 m Ho = 4 m Confined aquifer Impermeable ManCer. DEKKER, INC. 270 Mudison Avenue. New York. New York 10016 out per hour. The water elevation in an observation well 3.0 m away from the test well was 2.1 m and another 6.0 m away was 2.7 m from the roof level of the impervious stratum of the aquifer. Find the value of k of the soil in m/sec. ( Copyright O Marcel Dekker, Inc. All rights reserved.

Q.11.19 A field pumping test was conducted from an aquifer of sandy soil of 4 m thickness confined between two impervious strata. When equilibrium was established, 90 liters of water was pumped Observation wells Ap Test well Imet 7, = 6 m Impermeable stratum , = 3 m h, = 2.7 m h, = 2.1 m Ho = 4 m Confined aquifer Impermeable ManCer. DEKKER, INC. 270 Mudison Avenue. New York. New York 10016 out per hour. The water elevation in an observation well 3.0 m away from the test well was 2.1 m and another 6.0 m away was 2.7 m from the roof level of the impervious stratum of the aquifer. Find the value of k of the soil in m/sec. ( Copyright O Marcel Dekker, Inc. All rights reserved.

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

See similar textbooks

Similar questions

The static level of water table in an unconfined aquifer was 30 m above the underlying impermeablestratum. A 150 mm diameter well, penetrating the aquifer to its full depth, was pumped at the rate of20 liters per second. After several weeks of pumping, the drawdown in observation wells 20 m and 50m from the well were 3.5 m and 2 m respectively, and the observed drawdowns were increasing veryslowly (B.Sc., DU, 2012).a) Assuming equilibrium conditions, estimate the hydraulic conductivity and transmissivity of theaquifer.b) Estimate the drawdown just outside the pumped well.c) What will be the yield of a 300 mm diameter well which will produce the same drawdowns justoutside the well and at the 50 m distance observation well in (2)? What would be the drawdown at anearer observation well?
b) A 30-cm well fully penetrates an unconfined aquifer of saturated depth 25 m. When a discharge of 2100 lpm was being pumped for a long time, observation wells at radial distances of 30 m and 90 m indicated drawdown of 5 and 4 m respectively. Estimate the coefficient of permeability and transmissibility of the aquifer. What is the drawdown at the pumping well?
A well pumping test was carried out to determine the bulk permeability of a confined aquifer. The aquifer was overlain by a clay layer 4m thick, the depth of the aquifer was 20m, and the initial piezometric level in the aquifer was 2m below ground level. After a period of pumping when steady state conditions had been reached, the following observations were made:pumped flowrate q=1.637 li/swell radius=0.1mdrawdown just outside well = 2mdrawdown in piezometer at 100m distance from well = 0.2m.Determine the bulk permeability of the aquifer in m/s . Use the format for your answer 1.111 x 10^(-4).
A pumping test was carried out in a confined aquifer 15m thick overlain by an impermeable layer 30m thick. Rate of pumping was 0.12 m3/s, drawdowns in observation wells located 15m and 30m from the center of the pumping well were 1.60 m and 1.40 m respectively, from the initial groundwater level. The diameter of the pumping well is 0.40m. Determine the coefficient of permeability
) A pumping test carried out in a 50 m thick confined aquifer resulted in a flow rate of 600l/min. The thickness of the impermeable layer above the aquifer is 20 m and the originalwater level in the well was 2 mm below the ground surface (which is also the top of theimpermeable layer). Drawdowns in two observation wells located 50 m and 100 m fromthe well are 3 and 1 m respectively. Calculate:i) The coefficient of permeability of the aquifer, ii) The drawdown in the well, iii) The radius of influence. The diameter of the well is 0.6 m.
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. If the hydraulic gradient is 0.0092 determine the seepage velocity at 0.25 void ratio?
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?
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 well 12‐in in diameter penetrates 108 ft below the static water table. After a longperiod of pumping at a rate of 350 gpm, the drawdowns in wells 57 ft and 148 ft from thepumped well were found to be 12 ft and 7.4 ft, respectively.(a) What is the transmissivity of the aquifer?(b) What is the approximate drawdown in the pumped well?
A permeability pumping test was carried out in a confined aquifer with the piezometric level before pumping is 2.18 m. below the ground surface. The aquiclude (impermeable layer) has a thickness of 5.7m. measured from the ground surface and the confined aquifer is 7.6 m. deep until it reaches the aquiclude (impermeable layer) at the bottom. At a steady pumping rate of 15.6 m3/hour the drawdown in the observation wells were respectively equal to 1.62 m. and 0.47 m. The distances of the observation wells from the center of the test well were 15 m. and 32 m. respectively. 1.Compute the depth of water at the farthest observation well. 2. Compute the coefficient of permeability. 3. Compute the transmissibility of the impermeable layer.
The following data relate to a pump-out test: Diameter of well = 24 cm; Thickness of confined aquifer = 27 m; Radius of circle of influence = 333 m; Draw down during the test = 4.5 m; Discharge = 0.9 m^3/s.What is the permeability of the aquifer in mm/s? Choices: a. 2.15 x 10^-2 b. 4.5 x 10^-1 c. 93 X 10^-1 d. 1.6 X 10^-1
A 30 cm well penetrates an unconfined aquifer of saturated depth of 25m. When a discharge of 2100 lpm was being pumped for a long time, observation wells at radial distances of 30m and 90m indicated drawdown of 5m and 4m, respectively. Estimate the coefficient of permeability and the drawdown at pumping well.