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A test well is to be constructed for dewatering purpose in a planned excavation for foundation. The radius of the test well is 400 mm. The constant yield from the test well is 5.25 m3/min with a drawdown height of 6.3 m. Thickness of the water-bearing stratum above an impervious layer of clay is 11.5 m. Water table level is 1.80 m below the ground surface. The hydraulic conductivity of the pervious stratum is 0.15 m/min. Draw the aquifer and determine the following parameters: a. Radial distance at zero drawdown b. Depths of excavations for horizontal radial distances of 100 m and 280 m from the test well that will just reach the water surface levels along the drawdown curve.

A test well is to be constructed for dewatering purpose in a planned excavation for foundation. The radius of the test well is 400 mm. The constant yield from the test well is 5.25 m3/min with a drawdown height of 6.3 m. Thickness of the water-bearing stratum above an impervious layer of clay is 11.5 m. Water table level is 1.80 m below the ground surface. The hydraulic conductivity of the pervious stratum is 0.15 m/min. Draw the aquifer and determine the following parameters: a. Radial distance at zero drawdown b. Depths of excavations for horizontal radial distances of 100 m and 280 m from the test well that will just reach the water surface levels along the drawdown curve.

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 7.3P
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A test well is to be constructed for dewatering purpose in a planned excavation for foundation. The radius of the test well is 400 mm. The constant yield from the test well is 5.25 m3/min with a drawdown height of 6.3 m. Thickness of the water-bearing stratum above an impervious layer of clay is 11.5 m. Water table level is 1.80 m below the ground surface. The hydraulic conductivity of the pervious stratum is 0.15 m/min. Draw the aquifer and determine the following parameters:
a. Radial distance at zero drawdown
b. Depths of excavations for horizontal radial distances of 100 m and 280 m from the test well that will
just reach the water surface levels along the drawdown curve.

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