Welcome to the forums Wilco!
It sounds like you have a slightly off-the-norm pond plan, but nothing the professionals can't handle.
My novice concern would be the amount of watershed your pond would have. I cannot tell from your topo, but a one acre pond might require 10 acres of water shed...depending. You might be able to get by with less IF the rain runs off the hillside faster that it soaks in. I should not be advising you on this topic, actually. My point is...start with the water shed concerns too! Too little watershed and you have a one acre hole with 1/4 acre of water...not good. Or the opposite, too much water shed and the dam gets overrun too often.
Augusta is a beautiful area I am sure you will like it.
