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#482496 - 11/11/17 11:07 AM Automatic syphon system in northern climates
DC70 Offline

Registered: 12/15/08
Posts: 12
Loc: Indiana
My syphon system is two 6 inch pipes sharing a single vent. The entire system is inside of the dam. I used a 10 inch sock pipe to bring the water level of the pond inside the dam to the vent. Not pictured is the 18 inch piece of culvert pipe I put over this that acts as a pit. I ran a 4 inch piece of pipe to the surface with a grate flush with the ground for the air to enter. I also capped the pit with a concrete cap and covered it with dirt and grass. My dam is 3 feet higher than the water level and I live in an area with an 18 inch frost depth. Even in southern climates, You wouldn't have to worry about debris clogging the vent or having a pipe to mow around with this design.

I extended the sock over the tee to keep any dirt from entering the sock pipe as I backfilled. I removed it once I had everything backfilled and compacted.

This is the inside of the dam.

The sock pipe is covered in #2 gravel.

Here is the syphon in action.

Edited by DC70 (11/18/17 11:02 AM)

#482584 - 11/12/17 07:38 PM Re: Automatic syphon system in northern climates [Re: DC70]
gully washer Offline

Registered: 01/07/13
Posts: 308
Loc: Texas
That’s an interesting concept. Took me a moment to wrap my head around it…..lol

Looks like you did a really nice pipefitting job………. Thanks for posting the pics.

#482771 - 11/16/17 05:25 PM Re: Automatic syphon system in northern climates [Re: DC70]
DC70 Offline

Registered: 12/15/08
Posts: 12
Loc: Indiana
I wish I had taken more pictures. I installed this in October 2010 and I haven't had a problem with it yet.I did a search on syphon systems and didn't come up with any designs for cold climates. I did find some post about not being able to do an automatic syphon system in cold climates. So I just wanted to put something on here in case somebody searched for it.

#482773 - 11/16/17 07:39 PM Re: Automatic syphon system in northern climates [Re: DC70]
wbuffetjr Offline

Registered: 08/16/14
Posts: 680
Loc: in the mountains
I wish you had taken more pics too!!!

#482821 - 11/17/17 08:41 PM Re: Automatic syphon system in northern climates [Re: DC70]
DC70 Offline

Registered: 12/15/08
Posts: 12
Loc: Indiana
I just finished another pond with this same design. It is a small 1/3 acre pond. It has a watershed around 3 acres. So two 4 inch pipes should be enough. I just finished it mid September. So here are some pictures of that install with a little description of what I did:

I used two 4 inch sdr 35 pipes for the primary drain with a 2 inch vent. I used a 6 inch sock pipe to allow the water level inside the dam up to the 2 inch vent. All this is just in front of the core.

Here you can see where the sock pipe resurfaces on the slope of the dam.

I covered the sock pipe in #2 gravel.

I'm at full pool and my grass is coming up, I haven't had enough rain to confirm if it will go into syphon. My dam is 16 inches higher than the full water mark and my emergency spillway is 6 inches lower than the dam.

Edited by DC70 (11/18/17 11:05 AM)


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