No. | Material | Porosity (%) | No. | Material | Porosity (%) |
1 | Soil | 50 - 60 | 7 | Gravel | 30 - 40 |
2 | Clay | 45 - 55 | 8 | Gravel and sand | 20 - 35 |
3 | Mud (silt) | 40 - 50 | 9 | Sandstone | 10 - 20 |
4 | Medium sand and coarse | 35 - 40 | 10 | Shale | 1 - 10 |
5 | Uniform sand | 30 - 40 | 11 | Limestone | 1 - 10 |
6 | Fine sand and medium | 30 - 35 |
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