Thanks VikingSniper, in that picture, the drop section between triangle wedge riffles seem very shallow in depth, and I do not understand all the numbers in the picture?
I see Calfornia Sluice Box(Jr., Stream, & GMS), US Prospector(G1 & G2), and Angus MacKirk's 'Omega' all have plastic drop riffles. But the 'Omega' is the only one with a combination of both drop and dual ramp riffles-two step ramp riffles(like used on the Angus MacKirk's river sluices and the Le Trap).
I have a Le Trap and have never owned or used a drop riffle sluice BUT I just ordered parts for two Calfornia Sluice Box highbankers and they have not come in the mail yet.
Anyone out there that has used drop riffles, how is their performance, and are you satisfied with them??