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effective porosity

effective porosity
1. The proportion of the total pore space in a rock which is capable of releasing its contained water. Clay, for example, may have a total porosity of 50 per cent or more, but little if any of the water contained in these pores may be released, because of the retentive forces (e.g. surface tension) that hold it within the rock.

2. The proportion of the pore space through which groundwater flow occurs. For example, in fractured rocks the majority of flow occurs in the fractures, and intergranular pore water may be almost static. In porous rocks some pores may have only one connection with the general pore space (‘blind’ pores) and so contain only static water.

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"effective porosity." A Dictionary of Ecology. . Encyclopedia.com. 18 Oct. 2017 <http://www.encyclopedia.com>.

"effective porosity." A Dictionary of Ecology. . Encyclopedia.com. (October 18, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/effective-porosity-0

"effective porosity." A Dictionary of Ecology. . Retrieved October 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/effective-porosity-0

effective porosity

effective porosity
1. That proportion of the total pore space in a rock which is capable of releasing its contained water. Clay, for example, may have a total porosity of 50% or more, but little if any of the water contained in these pores may be released, because of the retentive forces (e.g. surface tension) that hold it within the rock.

2. The proportion of the pore space through which groundwater flow occurs. For example, in fractured rocks the majority of flow occurs in the fractures, and intergranular pore water may be almost static. In porous rocks, some pores may have only one connection with the general pore space (‘blind’ pores) and so contain only static water.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"effective porosity." A Dictionary of Earth Sciences. . Encyclopedia.com. 18 Oct. 2017 <http://www.encyclopedia.com>.

"effective porosity." A Dictionary of Earth Sciences. . Encyclopedia.com. (October 18, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/effective-porosity

"effective porosity." A Dictionary of Earth Sciences. . Retrieved October 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/effective-porosity