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Let take a high powered 5quot; dredge with water entering the sluice at 10 feet per second. The water under a 1/2quot; woven wire will drop the speed approximately 20% a 3/8quot; woven will drop the speed 35% slower a 1/4quot; woven will slow the material 50%. So we all know that a flour gold is very difficult to capture at higher speed water flows.