I agree with Greg. You need to have the situation looked at by a pro. If you put in a siphon system and it is done perfectly the problem is not fixed. If that old pipe goes it could empty the lake and even damage the dam. The key is the status of the old pipe. Here is a link to a typical siphon system.

http://www.ponddampiping.com/ look at the left side for piping examples



Last edited by ewest; 03/30/10 01:17 PM.