What hight should Riffles be?

[mrmanpig1]

What hight should my riffles be they keep getting backed up and I think they are to tall

 

[Jason in Enid]

That's a complicated question! Riffle height is one part an equation that also includes, style of riffle, riffle spacing, riffle angle, sluice box angle, depth of water, speed of water, type of material being run, size of material being run.

Is this for a river sluice, dredge or highbanker?

 

[mrmanpig1]

I'm running rocky sand and it is just a wooden sluice that I'm using in my yard with buckets of dirt to see if creeks have gold in them.

 

[Ragnor]

I would go with about one inch high, 7 inches on center. Run it near flat, like 1:14 or so.

That's what I would do. For wood. But I would use 6" corregated pipe flayed in half instead.

 

[Goldwasher]

you want your riffles to be the height of the material your running.. !/2 inch classification = 1/2 inch riffles. around 1 1/2 to 2 inches apart. If your going to have slow flow and only fine gold classify more and go smaller.