2: A (50 cm) well fully penetrates an unconfined aquifer of saturated depth 80 m. When a discharge of (50 m3/min) was being pumped for a long time, observed wells at radial distances of 100 and 300 m indicated drawdown of 1 and 0.5 m respectively. Estimate the coefficient of permeability (K) and transmissibility (T) of the aquifer, drawdown at the pumping well and the slop of water table?

2: A (50 cm) well fully penetrates an unconfined aquifer of saturated depth 80 m. When a discharge of (50 m3/min) was being pumped for a long time, observed wells at radial distances of 100 and 300 m indicated drawdown of 1 and 0.5 m respectively. Estimate the coefficient of permeability (K) and transmissibility (T) of the aquifer, drawdown at the pumping well and the slop of water table?

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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Similar questions

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.
Answer both 1 (i) and (ii) 1) i) A 6 inch diameter well that fully penetrates a 40ft thick open aquifer is pumped at a rate of 100 gpm. The drawdown in the well is 22ft when a steady water level is established. The drawdown in a well 152ft distant is 12ft. Estimate the coefficient of permeabiliity of the soil deposit. ii) Discuss the validity of the answer obtained in 1( i ) and suggest how would you improve the test data obtained to produce a better value of k. Why?
a 30 cm well penetrates an unconfined aquifer of saturated depth 25m. When a discharged of 2100 lpm was being pumped for a long time, observation wells at radial distances of 30 and 90 m indicated drawdown of 5 and 4 m respectively. estimate the coefficient of permeability of the aquifer and the drawdown at drawdown at pumping well.
A confined aquifer has a transmissivity T = 200 ft2/day (18.6 m2/day) and a storativity S = 0.0002. A fully penetrating well begins pumping in this aquifer at a rate of 1500ft3/day (42.5m3/day). Using the Theis solution predict the drawdown h0 h at a radius of r = 100 ft (30.5 m) at the following elapsed times: 10 minutes, 1 hour, 5 hours, and 24 hours. *tip* Spreadsheet software could help you do these repeated calculations.
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.
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)
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°
Given A pump test was conducted on a test well drilled into a confined aquifer that is 4.80 m thick. Two observation wells were drilled at 11 m and 44 m from the observation well, respectively. Once equilibrium was reached, the height of the piezometric surface was 7.3 m at the first observation well and 9.2 m at the second observation well. Required If 425 L/min were pumped at steady flow, determine the coefficient of permeability of the permeable soil in the aquifer, in cm/s (include 3 digits after the leading zeros). Your Answer:
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?
Q2) A fully penetrating well of diameter 0.3 m is located in an uncontined aquifer of saturated depth 45 m. If the drawdown in the well is 15 m for the discharge of 1200 m³/day and the radius of influence is 300 m, compute hydraulic conductivity?
26: ( ) A 40 cm well fully penetrated an unconfined aquifer of saturated depth 15 m. when a discharge of 1200 Ipm was being pumped for a long time, observed wells at redial distances of 25 and 100 m indicated of 7 and 4 m respectively. Estimate the coefficient of permeability of the aquifer. What is the drawdown at the pumping well?
2. (a) A well in an aquifer is pumped over a long period at a rate of 0.05 m3 /s under approximate steady-state conditions. The steady-state drawdowns, from the water table level, at two observation wells at 25 m and 50 m from the abstraction well were observed to be 15.3m and 9.5m, respectively. If the saturated thickness of the aquifer prior to pumping is 80 m, determine the hydraulic conductivity of the aquifer material. (b) Will the actual drawdown in the pumping well be more than the theoretical drawdown? If yes, why and what measures can you recommend for reducing the drawdown in the pumping well?