Unless you happen to be standing on a hilltop or swimming in the ocean right now, you are on a watershed. These unsung wonders of topography and hydrology are an important contributor to the rain cycle and yet we humans tend to abuse them.
"How Watersheds Work" 12 January 2017.
HowStuffWorks.com. <http://www.stuffyoushouldknow.com/podcasts/watersheds.htm> 17 January 2017