An unconfined fine sand aquifer has a base elevation of 50 ft (15.2 m). From elevation 50 to 68 ft (15.2 to 20.7 m), the average horizontal nydraulic conductivity is 0.8 ft/day (0.24 m/day), and from 68 to 95 ft (20.7 to 29.0 m) the average horizontal hydraulic conductivity is 3.0 t/day (0.91 m/day). Calculate the transmissivity of the saturated portion of the aquifer when the water table is at (a) elevation 75 ft (22.9 m), and ´b) at elevation 85 ft (25.9 m).

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Q: depth h of the water.

A:

Q: Write down the Falling-head permeability test.

A: Falling head permeability test: For fine sand falling head permeability test is used. In case of…

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A:

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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.