Thank you for this advice! We did run into this already at one place we were looking at...a pond at the back of the property was "seasonal." Filled up in the Fall/Winter and emptied in late Spring/early Summer. It turns out the land had been screwed up by the Army Corps of Engineers about 60 year prior, and they created a bunch of non-functional culverts and created a wet, soggy, nasty mess in this valley of about 10 acres. We were interested in fixing the culverts and bringing up part of the topography to create better drainage and year round maintenance of the pond--- but part of the pond (which the county had decided to name) was on a neighbor's property so we wouldn't have full rights to it. The icing on the cake was when I found out from a fellow farmer friend that they had JUST declared that swampy mess to be protected wetlands for the Salmon. So. We moved on.