Thanks again for the info I'll give the orange trick a try.

What do I measure with the google planimeter? I know the amount of acres surrounding my land but obviously I don't get watershed from all of it right?

My pond site is a low spot with a high watershed and its right at the water level. I've done a couple of test holes about 5 ft deep and they filled right up and have not went down. The property behind me is all higher ground then mine and that is 400 acres.

Any help figuring out how to calculate the watershed acres would greatly be appreciated