Hi Gambler. If your pond stays full from runoff, it will probably stay full after digging it deeper. Of course that depends on what you run into when you dig. If your pond has a dam, it will certainly deepen and continue to hold water if you raise the dam height.

Filling a pond is no problem for those of us in high rain areas. If annual rainfall is in excess of 50", even a "sky pond" (a pond with no runoff) will stay reasonably full. Of course having runoff is much more reliable and desirable.

Shrimp