Pls help ASAP A well pumping test was carried out in an unconfined soil layer ofthickness 15 m to determine its hydraulic conductivity. The rate ofpumping was 10.6 L/s. Drawdowns in observation wells located at15 m and 30 m from the centre of the pumping well were 1.6 mand 1.4 m, respectively, from the initial groundwater table located at1.9 m below the ground level. Calculate the hydraulic conductivity ofthe soil layer.

Given data in question Unconfined aquifer Discharge Drawdowns Radius of influence Total height…

Answered: A well pumping test was carried out in…

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 carried out in confined aquifer thickness 2 m and the following measurement was recorded. Rate of pumping was 10 m^3/s; drawdown in pumping well was 2.0 m while on the observation well located at 15 m and 20 m from the centre of the pumping well were 1.6 m and 1.4 m, respectively. Determine the hydraulic conductivity of soil.
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
49. 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. Determine the coefficient of permeability of the soil.
The permeameter in a perrneability test setup involves a soil sample 200 mm diameter and a length of 30 mm. The height of water is kept constant at 400 mm. In a duration of 4 min, water was collected in the graduated flask having a volume of 420 cu. cm. Determine the following. Flow Rate Hydraulic gradient Hydraulic conductivity
A constant head hydraulic conductivity test is performed on a sample from anaquifer. Determine the horizontal hydraulic conductivity for the following specimen in units of [cm/s].The length, L, of the specimen is 25cm and the diameter of the specimen is 7.5cm. The specimen issubjected to a head, e, of 0.2m. In 5 minutes of steady flow, 20ml of water exited the specimen. Specifythe most likely type of geologic material the specimen is based on the hydraulic conductivity value.
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.
P 4: A sand sample of 35cm2 cross sectional area and 20cm long was tested in a constant head permeameter. Under a head of 60cm, the discharge was 120ml in 6min. The dry weight of sand used for the test was 1120g, and G3=2.68. Determine (a) the hydraulic conductivity in cm/s, (b) the discharge velocity, and (c) the seepage velocity. Answers: a) 3.174 x 103 cm/s, b) 9.52 x 10³ cm/s, c) 2.36 x 10-² cm/s
A well was constructed to pump water from a confined aquifer. Two observation wells were constructed at distances of 350 m and 800m respectively. At a steady pumping rate of 0.39 m^3/min, the drawdown in the observation wells were respectively equal to 1.6 m and 7.8 m. Diameter of the test well is 0.95 m and thickness of confined aquifer is 16 m. a. Determine the hydraulic conductivity of the soil in m/min. (IN EXPONENTIAL FORM AND IN 2 DECIMAL PLACES) b. Determine the drawdown at the test well in m. (IN 2 DECIMAL PLACES) c. What is the value of the transmissivity of the confined aquifer in m^2/day? (IN 2 DECIMAL PLACES)
Question 2 * The permeameter in a permeability test setup involves a soil sample 200 mm diameter and a length of 30 mm. The height of water is kept constant at 400 mm. In a duration of 4 min, water was collected in the graduated flask having a volume of 420 cu. cm. Determine the following. Flow Rate o Hydraulic gradient o Hydraulic conductivity
Q-In a groundwater field test, a tracer took 8 hours to travel between two observation wells which are 56 m apart. The difference in water table elevations in these wells was 0.70m. The volume of the void of the aquifer is 30% of the total volume of the aquifer. What is the hydraulic conductivity of the aquifer, if the dynamic viscosity of water is 0.995×10-³Ns/m³?
A site consists of a homogenous dense silty sand layerof 8m thickness which is underlain by an imprevious stiff clau stratum. The initial water table was at 3m depth below the ground level. A pumping test was carrier out by pumping water at the rate of 0.7 m^3/min. Onservation wells were dug into the ground at 25m and 50m distances from the center line of the well. At steady state (i.e., when there was no change in water levels in the observation wells), the water levels in the two wells dropped by 500mm and 150mm, respectively. Determine the hydraulic conductivity of the clay sand layer.
Problem (4) The following results have been reported for field pumping test from a well, where the top permeable layer is unconfined and underlain by an impermeable layer, for a steady state condition: m3 q = 0.68 min h, = 5.6m at r, = 60m h, = 5m at r, = 30m Calculate the hydraulic conductivity (cm/s) of the permeable layer.

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