I'm with esshup, you should very seriously consider installing a primary drainage system. You're not too far north of me and at the very least, you need an overflow "emergency" spillway at least 15 foot wide and 2 feet below the lowest part of your dam. The E spillway should also be cut to drain water completely away from any part of the dam to avoid dam erosion and a breech.
A one acre pond with only 10 acres of watershed is "borderline" on a drain, because you really need 15 acres of watershed to support one surface acre of water there.
If you still have your pond builders there, you should really consider installing a 4-6 inch siphon system. That will move a lot of water when in full withdrawal mode, is reasonably priced for the pocket book, and could save your nerves (and a dam breech) when you get those 10-15" rain events we are never supposed to have here.
