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A well 12-in in diameter penetrates vertically through a confined aquifer with an initial piezometer level of 125 feet (ho). After a long period of pumping at a rate of 500 gpm, the drawdowns in the wells 80 ft and 120 ft from the pumped well were found to be 6.8 ft and 4.2 ft respectively. The thickness of the aquifer is 60 ft. What is the approximate drawdown in the pumped well to the tenths digit in feet? Hint: Use the Confined Well equation. Do not enter units, only the numeric answer.

A well 12-in in diameter penetrates vertically through a confined aquifer with an initial piezometer level of 125 feet (ho). After a long period of pumping at a rate of 500 gpm, the drawdowns in the wells 80 ft and 120 ft from the pumped well were found to be 6.8 ft and 4.2 ft respectively. The thickness of the aquifer is 60 ft. What is the approximate drawdown in the pumped well to the tenths digit in feet? Hint: Use the Confined Well equation. Do not enter units, only the numeric answer.

Principles of Geotechnical Engineering (MindTap Course List)
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter7: Permeability
Section: Chapter Questions
Problem 7.22P: Refer to Figure 7.24. The following data were collected during the field permeability measurement of...
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A well 12-in in diameter penetrates vertically through a confined aquifer with an initial piezometer level of 125 feet (ho). After a long period of pumping at a rate of 500 gpm, the drawdowns in the wells 80 ft and 120 ft from the pumped well were found to be 6.8 ft and 4.2 ft respectively. The thickness of the aquifer is 60 ft. What is the approximate drawdown in the pumped well to the tenths digit in feet? Hint: Use the Confined Well equation. Do not enter units, only the numeric answer.
Transcribed Image Text:A well 12-in in diameter penetrates vertically through a confined aquifer with an initial piezometer level of 125 feet (ho). After a long period of pumping at a rate of 500 gpm, the drawdowns in the wells 80 ft and 120 ft from the pumped well were found to be 6.8 ft and 4.2 ft respectively. The thickness of the aquifer is 60 ft. What is the approximate drawdown in the pumped well to the tenths digit in feet? Hint: Use the Confined Well equation. Do not enter units, only the numeric answer.
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