The best thing to do is start working with an agent that can help you with these answers. Personally, I would contact Planning and Zoning of your county and find Storm Water Management Design. They may have blue prints of the pond and can answer questions you may have. They would be more experienced in these matters. I would ask is their an additional run-off from the pond in case of a severe storm. These ponds are not designed to hold water for a long period of time...their should be adequate run-off.
On a side note, friends of mine own a home in a cul-de-sac in Abingdon. The home backs to a Storm Water Management Pond which then backs to woods. They love it. You will see different types of birds, frogs, etc. If you like this sort of thing great.
Another quick thought. After a rain, go by and visit the pond. See for yourself how it is filling if it is filling at all.
Any questions, please fee free to contact me. Thanks.