Effective porosity

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The effective porosity , also open or flow-effective porosity , describes the pore portion of a rock volume that allows hydraulic transport of fluids in the subsoil: ${\displaystyle \Phi _{f}}$

${\displaystyle \Phi _{f}={\frac {V_{f}}{V_{ges}}}}$

in which

• ${\displaystyle V_{f}}$the pore space that contributes to the flow of water ${\displaystyle (m^{3})}$
• ${\displaystyle V_{ges}}$the entire volume of rock . ${\displaystyle (m^{3})}$

This rock volume must be hydraulically connected to one another, so-called dead-end pores do not contribute to the flow.

The effective porosity of aquifers is determined e.g. B. by a tracer experiment . The size of the effective porosity corresponds approximately to the size of the usable porosity in pore aquifers.