Welcome to PB DonB, tell us a little more about yer pond, did you have to import clay to seal it, or was it dug in native clay....any other types of soils or rock present? was there groundwater present when you dug pond? if yer construction techniques were good, it is likely just absorption into pond substrate and sides, however, if there is any hydraulic communciation under the dam or between the pond bottom or sides to the water table aquifer or coarser grained soils, you might have some reverse flow and hence seepage from pond, if its slow seepage and rainfall and other factors (creek, spring) can keep up with it than no problems.
