![]() ![]() ![]() Water velocity can be increased by either putting more water through the sluice box or by moving the same amount through faster. By increasing or decreasing the amount of water velocity over a set of riffles, the amount of water-action behind each riffle is also increased or decreased-which has an effect on the amount of concentrating action taking place. Most of the riffles being used today are designed so that a concentrating-action takes place behind the riffles. ![]() In setting up a sluice, if feasible, it is desirable to have enough water flow to move the material through the box as fast as you can shovel (or dredge) it in at full production speed. In this way, you will be able to act from direct observation to ensure that your, or anyone else’s, sluicing device will be recovering gold to the fullest extent possible. Therefore, rather than give you a formula, I will attempt to give you an understanding of what affects the proper amount of water velocity will cause in a sluice box, and also what the affects are of too much or too little water velocity. There is no exact formula for setting the proper water velocity through a sluice box which will work optimally under all conditions for all the different types of riffles being used today. This can change, depending upon the volume and velocity of water being used, and/or the average shape, size, volume or weight (specific gravity) of material that you are processing. As a general rule, the optimum slope-setting of a sluice is around one inch of drop per linear foot of box. ![]()
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