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The specific yield S_{γ} of an aquifer is defined as the ratio of volume of water drained by gravity V_{wy} to the total volume V. It is expressed as percentage. The specific yield S_{γ} is an indication of the water yielding capacity of an unconfined aquifer.
The value of specific yield depends upon the shape of the pores.
The specific yield S_{γ} is given by,
S_{γ}=(V_{wy}/V)*100. The specific yield S_{γ} is proportional to the volume of water drained. This implies that the value of specific yield depends upon the shape of the pores.
The specific retention SR of an aquifer is defined as the ratio of volume of water retained VwR to the total volume V. It is expressed as percentage.
The relation between porosity n, specific retention SR, specific yield Sγ is __________
The porosity n, specific retention S_{R}, specific yield S_{γ} is given by,
S_{γ }= (V_{wγ}/V)*100 and S_{R }= (V_{wR}/V)*100
V_{w }= V_{wγ}+ V_{wR}
But n = (V_{w}/V)*100
∴ n = S_{R}+S_{γ}.
In the storage coefficient, the unit change in the component of the head is measured in _________ to the surface.
The storage coefficient is defined as the volume of water that an aquifer releases per unit surface area per unit change in the component of head normal to that surface.
The coefficient of transmissibility is defined as the rate of flow of water through a horizontal strip of unit width and full saturation height under unit hydraulic gradient.
For a fully saturated soil mass of unit width extending to depth infinity, the discharge through it is known as the coefficient of transmissibility when the hydraulic gradient is unity.
If b is the aquifer thickness, the relationship between coefficient of transmissibility T and coefficient of permeability is ________
The coefficient of transmissibility T equals the coefficient of permeability k multiplied by the aquifer thickness b. T = bk.
The drawdown, corresponding to a steady discharge, are observed at a number of wells in _______
The permeability can be determined by pumping out test. Pumping must continue at a uniform rate for a sufficient time to approach a steady state condition.
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