A well is constructed to pump water from a confined aquifer. Two observation wells are constructed at distances of 100m and 1000m respectively. Water is pump from the pumping well at a rate of 0.2ms/min. at steady state, the draw down is observed as 2m and 8m, respectively in the farthest and the nearest observation wells. Diameter of the test well is 1m. a) Determine the coefficient of permeability in cm/sec if the thickness of the aquifer is 20m. b) Determine the draw down in the test well.

A well is constructed to pump water from a confined aquifer. Two observation wells are constructed at distances of 100m and 1000m respectively. Water is pump from the pumping well at a rate of 0.2ms/min. at steady state, the draw down is observed as 2m and 8m, respectively in the farthest and the nearest observation wells. Diameter of the test well is 1m. a) Determine the coefficient of permeability in cm/sec if the thickness of the aquifer is 20m. b) Determine the draw down in the test well.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter7: Seepage

Section: Chapter Questions

Problem 7.1P

See similar textbooks

Similar questions

A well is constructed to pump water from a confined aquifer. Two observation wells are constructed at distances of 100m and 1000m respectively. Water is pump from the pumping well at a rate of 0.2m3 /min. at steady state, the draw down is observed as 2m and 8m, respectively in the farthest and the nearest observation wells. Diameter of the test well is 1m. a. Determine the coefficient of permeability in cm/sec if the thickness of the aquifer is 20m. b. Determine the draw down in the test well.
Q-26: A 0.5 m diameter well fully penetrates an unconfined aquifer whose bottom is 150 m below the undisturbed groundwater table. The water is pumped out from the well at a constant rate of 0.1 m³/s. After equilibrium is reached, the drawdown observed in two observation wells at radial distances of 10 m and 50m are respectively 10 m and 5 m. Determine (i) The coefficient of permeability (in m/s) (ii) The drawdown in the well (in m)
A confined aquifer has a of recharge. K for the aquifer is 60 m/day, and n is 0.3. The piezometric head in two wells 1500 m apart is 70m and 60m respectively, from a common datum. The average thickness of the aquifer is 35m. Calculate the following. a. Volume discharged in 2 days in m3 Blank 1 b. Seepage velocity (cm/s) Blank 2
PROBLEM 2 A well is constructed to pump water from a confined aquifer. Two observation wells are constructed at distances of 100 m and 1000 m respectively. Water is pump from the pumping well at a rate of 0.2m3/min. At steady state, the draw down is observed as 2 m and 8 m respectively in the farthest and the nearest observation wells. Diameter of the test well is 1m. a. Determine the hydraulic conductivity in cm/s if the thickness of the aquifer is 20 m. b. Determine the drawdown in the test well.
A 2 ft diameter well penetrates vertically through a confined aquifer 50 ft thick. Whenthe well is pumped at 500 gpm in 1 day, the drawdown in a well 50 ft away is 10 ft andin another well 100 ft away is 3 ft. The storativity of aquifer is 0.0005. What is the valuefor transmissivity and drawdown? Note; the piezometric head is 100ft from datum.Combination of thiem & thies equation
Q3. A well pumping from a unconfined aquifer at steady rate of 293 m³/hr. Two observational wells were installed at distances of 35 and 100 m form the pumping well. Assume h,=45 m Determine the: a. Drawdown (hz' hı) if K = 0.25 m/hr b. Drawdown (hz hj) if K = 0.75 m/hr
A 2‐ft diameter well penetrates vertically through a confined aquifer 50 ft thick. When the well is pumped at 500 gpm, the drawdown in a well 50 ft away is 10 ft and in another well 100 ft away is 3 ft.(a) What is the approximate head in the pumped well for steady‐state conditions, and what is the approximate drawdown in the well?(b) Compute the transmissivity. Take the initial piezometric level as 100 ft above the datum.
QUESTION 11 1. The discharge from a fully penetrating well operating under steady state in a confined aquifer of 30 m thickness is 1500 liters/minutes. The drawdown observed at an observation well located at 20 m is 3 m. The transmissibility is 0.005 m²/s. Determine the location of the observation well with 0.5 m drawdown. Round off to two (2) decimal places, in m
A 0.5 m diameter well fully penetrates an unconfined aquifer whose bottom is 150 m below the undisturbed ground water table. The water is pumped out from the well at a constant rate of 0.15 m³/s. Coefficient of permeability of the medium is 30 m/d and draw down in an observation well at a radial distance of 50 m is 5 m. The draw down in the main well is m (round off to two decimal places).
The permeameter in a permeability test setup involves a sample 200mm diameter and a length of 30mm. The height of water is kept constant at 400mm. In a duration of 4 min, water was collected in the graduated flask having a volume of 450cu.m. Determine the flow rate. *
9) A well is located in a confined aquifer near the intersection of a constant head and impervious boundary. a) Estimate the steady state drawdown in the well for Q=2 ft³ s, rw = 1 ft, distance from the well to stream= 300ft and distance from well to impervious boundary= 150 ft. T = 0.14ft²/s b) Estimate the steady state drawdown at point P located midway between the well and the steam. The angle between the stream and the impervious boundary is 90°
The thickness of a horizontal, confined, homogeneous, isotropic aquifer of infinite areal extent is 30m. A well fully penetrating the aquifer was continuously pumped at a constant rate of 0.1 m³/s for a period of 1 day. The drawdowns given in the table below were observed in a fully penetrating well 90 m from the pumping well. Compute the transmissivity and the storativity by using: a) the Theis method of log-log matching. b) the Cooper-Jacob method of semi-log plotting. [For Part a), you have to first use attached Table to plot the values of W(u) versus 1/u on a log-log graph in the range of 10-9