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…

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 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.
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.
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Determine the following: a) hydraulic conductivity is ______ x10^3 cm/sec b) Transmissbility of the impermeable layer is _____ cm^2/sec c) The drawdown in the test well is ____ m

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