A pumping test as made in a fine sand extending to a depth of 50 ft where a bed of clay was encountered . The normal ground- water level was at the ground surface. Observation wells were established at distances of 10 ft and 20 ft from the pumping well. A steady state was reached at a rate of pumping equal to 1.2 gpm. The drawdown at the outer well was

A pumping test as made in a fine sand extending to a depth of 50 ft where a bed of clay was encountered . The normal ground- water level was at the ground surface. Observation wells were established at distances of 10 ft and 20 ft from the pumping well. A steady state was reached at a rate of pumping equal to 1.2 gpm. The drawdown at the outer well was

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 pumping test was made in a sand layer extending to a depth of 16m. The initial groundwater table was located 2m below the ground surface. Observation wells were sighted at distances 4m and 9.5m from the pumping well. Using a discharge of 0.4 cubic meters per hour, a steady level is attained at the pumping well. The measured drawdowns at the two observation wells are 2m and 0.25m respectively. Solve the drawdown 5m from the pumping well.
Problem # 2. A pumping test was made in a sand layer extending to a depth of 15m. The initial groundwater table is located 2 m. below the ground surface. Observation wells were sighted at distances 3m and 7.5m from the pumping well. Using a discharge of 0.4 m^3 per hour, a steady level is attained at the pumping well. The measured drawdowns at the two observation wells are 1.5 m and 0.35 m. respectively. a. Find the hydraulic head at the first observation well.b. Find the hydraulic head at the second observation well.c. Compute the coefficient of permeability.
A pumping test was carried out in a soil bed of thickness 15 m and the following measurements were recorded. Rate of pumping was 10.6 x 10^-3 m3/s ; drawdowns in observation wells located at 15 m and 30 m from the center of the pumping well were 1.6 m and 1.4 m,Trespectively, from the initial groundwater level. The initial groundwater level was located at 1.9 m below ground level. Determine k in cm/s. a. 2.6 x 10^-6 b. 5.0 x 10^-2 c. 3.47 x 10^-2 d. 6.7 x 10^-1
) 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 well with a diameter of 18 in. penetrates an unconfined aquifer that is 100ft thick. Two observation well are located at 100 ft and 235 ft from the well, and the measured drawdownsare 22.2ft and 21ft, respectively. Flow is steady and the hydraulic conductivity is 1400 gpd/ft^2. What is the steady-state rate of discharge from the well?
A well with a diameter of 18 in. penetrates an unconfined aquifer that is 100 ft thick. Two observation wells are located at 100 ft and 235 ft from the well, and the measured drawdowns are 22.2 ft and 21 ft, respectively. Flow is steady and the hydraulic conductivity is 1400 gpd/ft 2
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 pumping test was carried out in a soil bed of thickness 15 m and the following measurements were recorded. Rate of pumping was 10.6 x 10^-3 m3/s ; drawdowns in observation wells located at 15 m and 30 m from the center of the pumping well were 1.6 m and 1.4 m, respectively, from the initial groundwater level. The initial groundwater level was located at 1.9 m below ground level. Determine k in cm/s. a.2.6 x 10^-6 b.6.7 x 10^-1 c.3.47 x 10^-2 d.5.0 x 10^-2
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
“For a well draining 80 acres, with thickness 80 ft and permeability 15 md, assume Bo = 1.2, μ = 1.8 cp, rw = 0.3 ft, and the flow is steady-state flow following the Vogel correction. Plot IPRs in one figure for skin va“ues of s = 0, 5, 10, and 20. Assume the reservoir and bubble-point pressure are 5000 psi.”