Begemann (1974)
•correlation derived from experiences in Greece
Limo with sand: a=2.05403, b=27,46451
Gravel with sand: a=9.1, b=93
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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