Hey Joe,
Listen to Greg he knows his stuff!!
Here is something else you may want to keep in mind. Also keep in mind the information I am giving you here is general. Not written in stone. As Bill Cody says "It All Depends"
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.
