Gravel Calculator
In the Udden-Wentworth scale, gravel is categorized as granular gravel if it is 2-44 mm (0.079-0.157 in) in diameter or pebble gravel if it is 4-66 mm (0.2-2.5 in) in diameter. On the other hand, ISO 14688-1:2002 classifies gravel as fine (2.0-6.3 mm), medium (6.3-20 mm), or coarse gravel (20-63 mm). ... also referred to as bank run or river ...
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