A confined aquifer has a transmissivity, T, of 30 m2/day and a storage coefficient, S, of 0.0008. A production well of radius, r, 0.2 m is pumped at 200 litres/min for 4 days and shut off. Calculate the maximum drawdown and the drawdown 10 days after the start of pumping at the well.

A confined aquifer has a transmissivity, T, of 30 m2/day and a storage coefficient, S, of 0.0008. A production well of radius, r, 0.2 m is pumped at 200 litres/min for 4 days and shut off. Calculate the maximum drawdown and the drawdown 10 days after the start of pumping at the 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 7.6P

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Question

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A confined aquifer has a transmissivity, T, of 30 m2/day and a
storage coefficient, S, of 0.0008. A production well of radius, r, 0.2 m
is pumped at 200 litres/min for 4 days and shut off. Calculate the
maximum drawdown and the drawdown 10 days after the start of
pumping at the well.
Note: Calculate the result rounded to the second digit after the
decimal point.
Hint: Cooper-Jacobs Solution is valid for u<0.01:
In
2.25Tt
p2 S
S =
47T

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