having hydraulic conductivity of 2.0 cm/sec. The middle layer consists of the fine sand of thickness 300 cm, having hydraulic conductivity of 0.002 cm/sec. The bottom layer consists of coarse sand of thickness 400 cm, having hydraulic conductivity of 0.01 cm/sec.

having hydraulic conductivity of 2.0 cm/sec. The middle layer consists of the fine sand of thickness 300 cm, having hydraulic conductivity of 0.002 cm/sec. The bottom layer consists of coarse sand of thickness 400 cm, having hydraulic conductivity of 0.01 cm/sec.

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 7.14P

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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

Calculate the transmissivity of the confined aquifer if the flow is along the strata consist of a 3 layers. The upper layer consist of gravel of 400 cm having hydraulic conductivity of 2.0 cm/sec. The middle layer consists of the fine sand of thickness 300 cm, having hydraulic conductivity of 0.002 cm/sec. The bottom layer consists of coarse sand of thickness 400 cm, having hydraulic conductivity of 0.01 cm/sec.

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