Begemann (1974)
| • | correlation derived from experiences in Greece |
Buismann-Sanglerat
| • | correlation valid for sand and clay sand |
Farrent (1963)
| • | valid for sands, sometimes for sand with gravel (modified from experimental data) |
Menzenbach and Malcev
| • | valid for fine sand, sand-gravel and sand and gravel |
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