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・ Aquia, Virginia
・ Aquib Afzaal
・ Aquidaba
・ Aquidaban
・ Aquidabán River
・ Aquidabã
・ Aquidabã River
・ Aquidabã River (Mato Grosso do Sul)
・ Aquidabã River (Paraná)
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Aquifer properties
・ Aquifer storage and recovery
・ Aquifer Susceptibility
・ Aquifer test
・ Aquifer thermal energy storage
・ Aquifers in the United States
・ Aquifex
・ Aquifex aeolicus
・ Aquifex pyrophilus
・ Aquificaceae
・ Aquificae
・ Aquifoliales
・ Aquiherbosa
・ Aquil Abdullah
・ Aquila


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Aquifer properties : ウィキペディア英語版
Aquifer properties
The aquifer properties of the aquifer essentially depend upon the composition of the aquifer. The most important properties of the aquifer are porosity and specific yield which in turn give its capacity to release the water in the pores and its ability to transmit the flow with ease.
==Porosity==
In soil mechanics and hydrology, porosity is defined as the ratio of volume of voids to the total volume of porous medium. Mathematically it can be represented by the equation expressed as
:n = \frac = \frac = \frac
where e is void ratio, n is porosity, ''V''V is the volume of void-space (air and water), ''V''S is the volume of solids, and ''V''T is the total or bulk volume of medium.〔 Craig, R. F. ''Craig's Soil Mechanics.'' London: Spon, 2004, p.18. ISBN 0-203-49410-5.〕
The significance of the porosity is that it gives the idea of water storage capacity of the aquifer. Qualitatively, porosity less than 5% is considered to be small, between 5 and 20% as medium and the percentage exceeding 20% is considered as large.〔(【引用サイトリンク】 title=Properties of Aquifers )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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