A permeability test was carried out from a well that sunk through asurface layer of loose sand. Figure below shows the arrangement of pumping wells,together with relevant dimensions. Initially, the piezometric surface (ground water table)was located at a depth of 2.5m. When steady state was achieved at a pumping rate38. 5 m, the following drawdowns were observed.hourPumping well, d, = 3. 64mObservation well, d, = 0. 96mObservation well, d, = 0.48m%3DCalculate the coefficient of permeability of the sand in m/hr.62 m18 mGW.T12 mImpermeable strata

The given figure shown is an unconfined aquifer. Discharge, Q= 38.5 m3/hr The total depth of…

Answered: Calculate the coefficient of…

Engineering

Civil Engineering

Calculate the coefficient of permeability of the sand in m/hr.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Stresses In A Soil Mass

Section: Chapter Questions

Problem 8.14P

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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

A permeability test was carried out from a well that sunk through a
surface layer of loose sand. Figure below shows the arrangement of pumping wells,
together with relevant dimensions. Initially, the piezometric surface (ground water table)
was located at a depth of 2.5m. When steady state was achieved at a pumping rate
38. 5 m, the following drawdowns were observed.
hour
Pumping well, d, = 3. 64m
Observation well, d, = 0. 96m
Observation well, d, = 0.48m
%3D
Calculate the coefficient of permeability of the sand in m/hr.
62 m
18 m
GW.T
12 m
Impermeable strata

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