We've been working on one for a while now with very good results. The problem is that the average bilge pump is only made to run for about 20 minutes. So we went out and found 12 volt pumps that have actual bearings, not bushings. Then we run twin pumps to get the proper pressure.

It works very well in places where you can't use gas powered equipment.

I made one after some trial and error got it to work well. of course dredging is currently illegal here in California and we would NEVER and I mean NEVER do anything like that....

Find a couple videos here, hope that helps. https://www.youtube.com/channel/UCA6KMETirKJanbEKYPURiXg

My buddy does the electric dredge and does quite well. he bought a nozzle but I don't know how he gets the suction from the nozzle to the header box. I know he uses one or two of his 2,000 gph pumps.

I bought a 3700 gpm 12v pump. I saw where the guy on youtube put a funnel in the clean out pipe to create a jet stream for pressure. My understanding the pump itself does not push enough pressure.

I would like to try that