Not sure if this counts for anything but I recently drained one of my small ponds. Within a day or so water seeps up and fills it partially to about 6 inches. When I fill this pond completely, seepage is not a problem. In fact, the very slow rate it does go down (maybe an inch a month if that) is probably due to evaporation.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.