Well the siphon system is installed and here are some picts of the installation. I ended up going with 10" because based on my calculations this should have been an increase of 880gpm over the exsisting standard 15" drain pipe. So 55 percent more flow. Well we had some flash flooding yesterday and I wasnt impressed. The water rose faster than I had ever seen it and I ended up spending 2hours trying to clear out the emergency spillway which looked like a river. So the question comes to this. Do I need more freeboard? Do I need to add a second siphon? Did the exsisting siphon not start early enough? Or did everything work fine and and I'm just not use to seeing the water go over the emergency spillway and thats what it's for? I just thought that with the size of the pipe I used being a siphon and only supporting about 70 acres of watershed It would handle a fast 2 or 3 inch rain fall. its only a 1.3 acre pond. I guess I'm a little dissapointed. I'll post some picts of the install and yesterdays test of the siphon when we got some flash flooding. Click on the link below for all the photos of construction and yesterdays event.

pond siphon photos and videos





Last edited by Mikecr250; 06/08/13 12:45 PM.