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