A permeability test apparatus of diameter 82.5 mm contains a column of fine sand 460 mm long. When water flows through it under a constant head at a rate of 191 cm3/minute, the loss of head between two points 250 mm apart is 380 mm. Calculate the coefficient of permeability of the fine sand. If falling head test is made on the same sample using a standpipe of diameter of 30 mm, in what time will the water level in standpipe fall from 1560 mm to 1066 mm above outflow level.
A permeability test apparatus of diameter 82.5 mm contains a column of fine sand 460 mm long. When water flows through it under a constant head at a rate of 191 cm3/minute, the loss of head between two points 250 mm apart is 380 mm. Calculate the coefficient of permeability of the fine sand. If falling head test is made on the same sample using a standpipe of diameter of 30 mm, in what time will the water level in standpipe fall from 1560 mm to 1066 mm above outflow level.
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 7.17P
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A permeability test apparatus of diameter 82.5 mm contains a column of fine sand 460 mm long. When water flows through it under a constant head at a rate of 191 cm3/minute, the loss of head between two points 250 mm apart is 380 mm. Calculate the coefficient of permeability of the fine sand. If falling head test is made on the same sample using a standpipe of diameter of 30 mm, in what time will the water level in standpipe fall from 1560 mm to 1066 mm above outflow level.
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