02-B A sandy layer with 3.5x10 cm/s hydraulic conductivity, a pump-out test is carried out in a perforated well of 30 cm in diameter, extending into an impervious zone, and through an aquifer 20 m thick from the ground surface. The phreatic line is at 4 m below ground-surface level (see Fig. below). After 24 h of continuously pumping water out of the well, equilibrium has been reached. The discharge of the pump is 8.4 m³/h and the maximum drawdown is 7 m in pumping well and 6 m in observation well from ground surface. The effective porosity of the soil tested was estimated to be 0.29. Determine the radius of influence R of the well. Observation well 20 Ex WT

02-B A sandy layer with 3.5x10 cm/s hydraulic conductivity, a pump-out test is carried out in a perforated well of 30 cm in diameter, extending into an impervious zone, and through an aquifer 20 m thick from the ground surface. The phreatic line is at 4 m below ground-surface level (see Fig. below). After 24 h of continuously pumping water out of the well, equilibrium has been reached. The discharge of the pump is 8.4 m³/h and the maximum drawdown is 7 m in pumping well and 6 m in observation well from ground surface. The effective porosity of the soil tested was estimated to be 0.29. Determine the radius of influence R of the well. Observation well 20 Ex WT

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 45 cm well in an unconditioned aquifer of saturated thickness (40+8) m yields (600+10(2) lpm under a drawdown of 4m at the pumping well. Assuming radius of influence of (500+10(3)m, a. what is the hydraulic conductivity of the aquifer in m/day? b. what will be the drawdown 200 m from the well? c. what will be the piezometric head 400 m from the well
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A site consists of a homogeneous dense silty sand layer of 9 m thickness, which is underlain by an impervious stiff clay stratum. The initial water table was at 4 m depth below the ground level. A pumping test was carried out by pumping out water at the rate of 0.7 m°/min. Observation wells were dug into the ground at 15 m and 50 m 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 600 mm and 100 mm, respectively. Determine the hydraulic conductivity of the clayey sand layer. (Enter your answer to three significant figures.) k = cm/s
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Assume a chemical solvent, which is denser than water is spilled into the reservoir. How many days will it take for the contaminant to reach the observation well assuming only advection occurs in the aquifer? The stratum has a hydraulic conductivity of 4 x 10-² cm/sec The silty sand in the aquifer has a void ratio of 0.75. Observation well↓ el. 167.3 m Reservoir Clay Silty sand Clay 256 m el. 165.0 m 3.2 m
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13. A 300mm diameter test well penetrates 27m below static water table. After 24 hours of pumping at 6.9liters/second. The water level in an observation well at a distance of 95m from the test well is lowered 0.5m and the other observation well at a distance of 35m from the test well, the drawdown is 1.1m. Determine the coefficient of permeability of the aquifer in m/day 60.27 b. 6.03 e. 70.27 f. 7.03 а.