A sample of water has been analyzed for common ions and results are presented in the form of a bar diagram as shown. 2.65 4.10 6.35 6.85 meq/L 2+ Ca* Mg Na K 2- HCO, So, meq/L 0. 3.30 3.90 6.75 The non-carbonate hardness (expressed in mg/l as CaCO,) of the sample is

A sample of water has been analyzed for common ions and results are presented in the form of a bar diagram as shown. 2.65 4.10 6.35 6.85 meq/L 2+ Ca* Mg Na K 2- HCO, So, meq/L 0. 3.30 3.90 6.75 The non-carbonate hardness (expressed in mg/l as CaCO,) of the sample is

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 6.12P

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Concept explainers

Field applications of hydraulic conductivity

Hydraulic conductivity is one of the hydraulic properties of soil defined as a measurement of the ability of a porous medium to permit water movement or fluid flow through it. It is denoted by the letter K. It is influenced by the density and viscosity of the fluid. It is also called permeability. Hydraulic conductivity is defined as the ratio of velocity to the hydraulic gradient. The different methods used to determine the hydraulic conductivity are laboratory methods (constant head permeability tests and falling head tests), in-situ field methods (pumping in and pumping out tests), small scale field tests (infiltration tests and slug tests), and indirect methods such as estimation from grain size, consolidation test data, and horizontal capillary test. The pedotransfer function (PTF) method is a specific empirical estimating approach employed in the soil sciences is also used to determine the hydraulic conductivity of the soil.

Question

A sample of water has been analyzed for common
jons and results are presented in the form of a
bar diagram as shown.
2.65
4.10
6.35 6.85
meq/L
2+
Ca*
Mg
Na
K
2-
HCO,
SOA
cr
meq/L
3.30
3.90
6.75
The non-carbonate hardness (expressed in mg/l
as CaCO,) of the sample is

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A limestone core sample is saturated 100% with water. Calculate the absolute permeability of the core sample if the water is flowing at 4.15 cubic centimetres per second. The length of the core sample is 13.61 centimetres and its diameters if 7.13 centimetres. The pressure differential across the core sample is 25 atmospheric pressure and the water viscosity is 1.1 centipoises. Explain a method of how the permeability of this reservoir can be improved.
The result of the liquid limit tests where N is the no of blows and w is the water content in % are given as follows: Trial 1 N=11 w=53.9; Trial 2 N=15 w=50.6; Trial 3 N=23 w=48.1; Trial 4 N= 30 w= 46; Trial 5 N= 46 w=43.3; Trial 6 N= 53 w=41. The PL= 20 and the in situ moisture content is 35%. Determine the liquidity index. a.0.56 b.0.91 c.1.25 d.0.59
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The result of the liquid limit tests where N is the no of blows and w is the water content in % are given as follows: Trial 1 N=11 w=53.9; Trial 2 N=15 w=50.6; Trial 3 N=23 w=48.1; Trial 4 N= 30 w= 46; Trial 5 N= 46 w=43.3; Trial 6 N= 53 w=41. The PL= 20 and the in situ moisture content is 45%. Determine the plasticity index. a.22 b.17 c.27 d.12
The result of the liquid limit tests where N is the no of blows and w is the water content in % are given as follows: Trial 1 N=11 w=53.9; Trial 2 N=15 w=50.6; Trial 3 N=23 w=48.1; Trial 4 N= 30 w= 46; Trial 5 N= 46 w=43.3; Trial 6 N= 53 w=41. The PL= 30 and the in situ moisture content is 35%. Determine the plasticity index. A. 27 b. 12 C. 17 d. 22
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A cylindrical soil sample 50 mm in diameter and 200 mm in height is used as thepermeameter in a falling head permeability test setup. In one minute of observation, thehydraulic head in the 10 mm diameter standpipe through which test water went reducedfrom 900mm to 500 mm. During that time, 1.5 liters of water were collected in the graduate. Calculate the soil sample's permeability coefficient in cm/s.
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