1 - The Water System


The water system is like a busy airport; there are arrivals in to the system, movement towards the departure gates, exiting from the system and of course the inevitable delays in holding pens.

Photo Credit: <a href="https://www.flickr.com/photos/10687935@N04/8541178173/">Robert S. Donovan</a> via <a href="http://compfight.com">Compfight</a> <a href="https://creativecommons.org/licenses/by/2.0/">cc</a>