A fully penetrating 12-in diameter well has its bottom 80 ft below the static water table. After 24 hr of pumping at 1100 gpm, the water level in the test well stabilizes to 10 ftbelow the static water table. A drawdown of 3.65 ft is noticed in an observation well 320 ft away from the test well. Determine the hydraulic conductivity of the aquifer.

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Answered: A fully penetrating 12-in diameter well…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A 12 inch diameter well was installed in an unconfined aquifer consisting of a 60 foot thick layer of sand. The water table was 15 feet below the ground surface before pumping of the well began. The well was then pumped at a rate of 30 gallons per minute and the water level in the well dropped to 45 feet below the ground surface after a steady-state condition was reached. The radius of well influence is 4000 feet. a) Calculate the permeability of the sand b) Compute and plot the drawdown surface
A 300 mm diameter test well penetrates 24 m. below the static water table. After 24 hours of pumping at 69 liters per second, the water level in an observation well at a distance of 96 m. from the test well is lowered by 0.60 and the other observation well at a distance of 34 m. from the test well, the drawdown is 1.2 m a) Compute the coefficient of permeability of the unconfined aquifer b) Compute the transmissivity of the unconfined aquifer.
A 400 mm diameter test well penetrates 27 m below the static water table. After 24 hours of pumping at 75 liters/sec. the water level in an observation well at a distance of 100 m from the test well is lowered 0.35 m. The other observation well at a distance of 40m from the test well has a drawdown of 0.97 m. Compute the transmissibility of the aquifer in m2/day.
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.
A single ideal pumping well, with radius of 1.0 ft and flow rate of 155 gpm, exists in an ideal confined aquifer. The aquifer has a saturated thickness of 82 ft. The pump continues running until equilibrium conditions are reached. The drawdown at the pumping well is 42 ft, and the drawdown at an observation well 138 ft away is 7.5 ft. Determine: Find the transmissivity in ft^2/day and hydraulic conductivity in ft^2/day Find the radius of influence in feet.
14. A 300 mm diameter test well penetrates 24 m below the static water table. After 24 hours of pumping at 69 liters/sec, the water level in an observation well at a distance of 96 m from the test well is lowered 0.60 m and the other observation well at a distance of 34 m from the test well, the drawdown is 1.2 m. Compute the coefficient of permeability of the unconfined aquifer in m/day. Compute the transmissivity of the unconfined aquifer in m2/day. Compute the transmissivity if there is a confined aquifer of 8m, thick below the unconfined aquifer m2/day.
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.
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?
Question Two An unconfined aquifer with a well pumping 0.4m3/s and saturated thickness is 24m.lf the drawdown 50m from the well is 1m and the drawdown 100m from the well is 0.5m, calculate the hydraulic conductivity and transmissivity of the aquifer.The solution should include a labeled diagram.
Problem 1 A field test is conducted in a confined aquifer by pumping a constant discharge of 525 ft/hr from a 8-in. diameter well. After steady state is reached, a drawdown of 3.2 ft is measured in the pumped well. Also measured are drawdowns of 2.55 ft, 2.1 ft, 1.9 ft, and 1.86 ft respectively at 10, 150, 300, and 450 ft from the pumped well. Determine the transmissivity for this aquifer and the drawdown at a location 1,500 ft from the well. (Create a plot of s versus log r in excel and provide your plot)
Hydrology engineering Q3. An unconfined aquifer has a thickness of 30m . A fully penetrating 20cm diameter well in this aquifer is pumped at a rate of 35 liter/ sec. . the drawdown measured in two observation wells located at distance of 10m and 100m from the well are 7.5m and 0.5m respectively .Determine the average hydraulic conductivity of the aquifer . At what distance from the well the drawdown is insignificant?
A 30cm diameter well fully penetrates an unconfined aquifer with saturated thickness ho=60m and hydraulic conductivity K-9x10-3 m/min, calculate the drawdown at point k and the drawdown at the pumping well, assume ro=120m near an impervious boundary. The well is being pumped at a constant rate of 1.5m³/min. Pw 30m k 50m 35m Impervious boudary

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