Just take a look at the watershed for the pond and locate the nearest body of water, be it a creek, river, pond, whatever.
What you're looking for is the possibility of fish migrating from there to your pond during a high water event, which seems to occur a lot lately here in Indiana.
Over the past 7 years, in addition to normal Spring flooding, my part of the state has experienced 2 so-called 100 year floods, and 1, 500 year flood.
That last one did a nice job of stocking the dugouts at the local ball field, with common river carp.
