If it's groundwater, then digging a deeper hole in the pond, locating the pump there and continually pumping while digging out the muck would be one solution. As long as the water table was higher than part of the pond, the pond would fill up to that depth once the pump stopped.

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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).