![]() ![]() The high pressure pump and a nozzle can also be used to move sand directly before you get to the layer where the targets are.Many dredging jobs are a maintenance situation where your pond or sewage lagoon is full and you need to clean it or you’ll run out of space. I don't know if you are searching for coins and jewelry or dredging for gold. It needs to be sized to develop the target point on the pump's operating curve. The most critical design decision will be the size of the nozzle restriction. ![]() The length of the hose carrying the sand will be critical, however, because of the high flow rate and the low pressure. The high pressure pump can be almost any distance from the venturi because the pressure head is high and the hose diameter will probably be large relative to the flow. You are probably looking at a suction pipe size of 2 or 3 inches and a pressure pump of roughly 25 GPM and 50 to 100 psi. I built mine out of 4 inch PVC pipe with a 5/8 nozzle and a pump that would put out 100 psi at 100 gallons per minute. If it will fit in the intake, it will come out the other end. I don't recommend a grid in front of the intake because it will block up almost immediately. The pump yes, but it will take a large filter or set of baffles to handle the large quantity of water and junk (small stones, shells, seaweed, etc.) that the pump will bring up. I don't think you can fit all you need for this on a small bicycle trailer. ![]() The principle is that a high pressure jet of water is shot into a larger water pipe and transfers the energy to the larger column of water, but at a much lower pressure and a much higher flow rate. I call the design a venturi pump and you can find some info on the internet on venturi pumps. Incidentally, the 6 foot deep hole was approximately 20 feet in diameter because of the angle of the sand falling into the hole is a constant. I did dig out a mooring that was 6 feet under the sand. The intent was to remove sand from sunken boats and moorings that had been buried under shifting sand banks. I have built a suction dredge similar to what you are considering. ![]()
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