I vote for the gasoline powered trash pump and fire nozzle method too. I'd see if I could do it from the back side providing the water isn't over the inlet side. Wash out as much dirt as possible, pull sticks out with rake, repeat.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).