Canyoncreek, in a previous comment, it sounded like you were tryin got understand the siphon system in this link? http://www.ponddampiping.com/syphon1.html

If so, I believe this video explains it well. You have to read the captions but I believe it explains it pretty well. See if that helps. From there, I think we can figure out how they are bringing this into the dam. Help?