Answered: A recuperation test was carried out on…

A recuperation test was carried out on a 1.5-meter diameter clay open well. Calculate the yield in m/hr of the said well at a specific point in time when the depression head is 1 m.

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 7.22P: Refer to Figure 7.24. The following data were collected during the field permeability measurement of...

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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.

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A recuperation test was carried out on a 1.5-meter diameter clay open well. Calculate the
yield in m/hr of the said well at a specific point in time when the depression head is 1 m.

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Problem # 2. A pumping test was made in a sand layer extending to a depth of 15m. The initial groundwater table is located 2 m. below the ground surface. Observation wells were sighted at distances 3m and 7.5m from the pumping well. Using a discharge of 0.4 m^3 per hour, a steady level is attained at the pumping well. The measured drawdowns at the two observation wells are 1.5 m and 0.35 m. respectively. a. Find the hydraulic head at the first observation well.b. Find the hydraulic head at the second observation well.c. Compute the coefficient of permeability.
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