> including massive siphons that literally pull the water over mountain ranges. I don't think that is physically possible. Water won't siphon more than 33ish v

> including massive siphons that literally pull the water over mountain ranges. I don't think that is physically possible. Water won't siphon more than 33ish vertical feet. It will just draw a vacuum in the pipe. EDIT: Found a good link. The word "siphon" is quoted on every use in this link, suggesting that they're not actual gravity-powered siphons. See #10. http://www.kcet.org/news/redefine/revisit/commentary/concrete-and-chaparral/a-self-guided-tour-of-the-los-angeles-aqueduct.html http://www.kcet.org/news/redefine/revisit/commentary/concret... EDIT2: Ok, they are gravity-powered, but not by the "pulling" action of the water on the downslope side of the siphon, as much as by the pushing action of the previous downward slope feeding into the siphon. Technically, it's still a siphon i guess, just operating at higher than atmospheric pressure.