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You might want the riffles closer together...depends on the material you plan on running. 20 degrees is also a little shallow. keep in mind you want to run material classified to the size of your riffles. Your riffle size is the height from the top of your expanded to the top of the riffle. So, if your riffles were at 90 degrees you would have 1/2 riffles and would want to classify to around have inch. Your gonna be at less than 1/2 tall so you would want to classify smaller. There is some wiggle room. You also want your riffles to be spaced about twice as far apart as your riffle is high.. too far apart and you may get packing in your moss. You want active exchange. when you get away from the riffle eddy material doesn't exchange as well. All of this is related to feed and capture ability. if you are dealing with mainly fine gold and classifying down pretty small your set up may be just fine. if your running material that is classified less you may want to adjust your riffle set.
Where do you live what kind of material are you running? It is a nice build and will last forever....hope you don't need to install wheels to move it...12 inches is a wide stream sluic..you will be moving a lot of water through that box..fast water is good but angle riffles lift fine gold into upper flow, and out the box you may want riffles at the head that are taller and shallower after. that way any fine gold that hasn't settled gets its chance and you won't have too much turbulence keeping it off the bottom.
Or you could stop all guess work and go with GOLD HOG !!!!!!!!
Riffles and Lake Superior sand are a bad combination from what I've seen. Look into "beach boxes" instead.
If you can remove everything from your sluice (expanded, riffles) You can put deep V matting in it. I have a Keene A52 and that's what I'm doing for a "beach box" I might go half V and half vortex also. Or a third half... Gold Hog matting. I will have to ask Doc which Hog mat is best for the beach.
If you can remove everything from your sluice (expanded, riffles) You can put deep V matting in it. I have a Keene A52 and that's what I'm doing for a "beach box" I might go half V and half vortex also. Or a third half... Gold Hog matting. I will have to ask Doc which Hog mat is best for the beach.
A year or so back I asked Doc the same question on another forum. At that time he suggested that I alternate a couple of Downdraft sections then a couple of Razorback, etc. for ocean beach sands. This summer I set my 5' sluice up with them and tried it at a beach just north of your location. The little creek I set up in had little flow at the time so my setup was far from ideal (not much black sand either) but I did catch some gold. I go there every year so maybe my next trip will have better operating conditions and more black sand availability.
Good luck.