Yes. I also have different size & spaced riffle ladders depending on the material & what gold size. Sometimes just a large type expanded mesh as riffles. Like in this photo
Which helped with a more gentle water flow to catch very fine gold. It allowed the bigger stones to tumble on down & out without them getting caught up behind a higher riffle, that would have needed a stronger water flow to push them on & also washing out the finer gold. These were the riffles that helped catch this fine gold in the Coromandel that was lost in the tailings from a stamper battery operation. .
JW 