Average Porosity (ϕ) values

ϕ < 0.05

0.05 < ϕ < 0.1

0.1 < ϕ < 0.15

0.15 < ϕ < 0.25

0.25 < ϕ < 0.30

ϕ > 0.30

Qualitative description

Negligible

Poor

Fair

Good

Very Good

Excellent