Well, I just got off the phone with the NRCS, and they said preliminary calculations show me to have about 40 acres of watershed there. Which would go with what RC51 said for a 2-3 acre. The NRCS guy said 1/2 acre again. I'm not sure what to think...
Excavated ponds may be preferred over embankment ponds in flat or gently sloping terrain and may not require an expensive dam. Floodplains should be not be selected as sites for either type of pond because the dam may be eroded by floods.
I figured since the land was so flat that I would end up with more of an excavation, rather than building a dam. There might be a small dam, but nothing big...
