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 |