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

Registered: 12/15/08
Posts: 21
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.


Edit: I'm adding a drawing that isn't exactly to scale of what I did, but maybe is representative of my 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 face of the dam.



The sock pipe is covered in #2 gravel.



Here is the syphon in action.


Edited by DC70 (09/26/18 11:18 PM)

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


Registered: 01/07/13
Posts: 345
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.

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

Registered: 12/15/08
Posts: 21
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.

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


Registered: 08/16/14
Posts: 1010
Loc: in the mountains
I wish you had taken more pics too!!!
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#482821 - 11/17/17 08:41 PM Re: Automatic syphon system in northern climates [Re: DC70]
DC70 Offline
Fingerling

Registered: 12/15/08
Posts: 21
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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#510735 - 08/25/19 12:11 PM Re: Automatic syphon system in northern climates [Re: DC70]
Trooper4985 Offline


Registered: 02/20/12
Posts: 29
Loc: NY
Is there any news on this build with regards to achieving full siphon and if it functioning during the winter freeze? The best I can tell I'm somewhere around a 5' frost line on most maps I have found online when going with the next lower level for safety with water pipes. I really like the advantages of this type of system for removing the lower oxygen water at the bottom of the pond and allowing better oxygenated water to enter the pond.

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#512169 - 09/29/19 10:47 PM Re: Automatic syphon system in northern climates [Re: DC70]
DC70 Offline
Fingerling

Registered: 12/15/08
Posts: 21
Loc: Indiana
I haven't had enough precipitation in the last 10 years to make the pipes kick into siphon mode during the winter freeze. I have no reason to think that it wouldn't work during the winter freeze, we just haven't had enough rain to make it go into siphon during winter freeze. I have seen 6 inches of snow weigh down the ice covering my pond push some water out the drainage pipes, just not enough to make it go into siphon mode.

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#512325 - 10/03/19 06:41 PM Re: Automatic syphon system in northern climates [Re: DC70]
Trooper4985 Offline


Registered: 02/20/12
Posts: 29
Loc: NY
I am going to try to replicate your design on the 1.5 - 2 acre pond I having built next summer on the NY/PA border.

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#512755 - 10/14/19 06:22 PM Re: Automatic syphon system in northern climates [Re: Trooper4985]
DC70 Offline
Fingerling

Registered: 12/15/08
Posts: 21
Loc: Indiana
This spring I had a muskrat tunnel down next to my vent and into my siphon pit. I had to dig it out and make sure the tunnels didn't cause any problems with my dam. Luckily it was just in the area of my pit. So while I was doing repair work, I decided to make some modifications. One of the problems with a single vent with 2 drain pipes was that at the start of siphon mode, my pipes would alternate the siphon until the water level raised a little more. It still went into full siphon mode, but probably allowed my water level to raise faster then it would have with two vents. So I modified it so each pipe has its own vent. I would recommend that if you go with dual pipes. I also made my pit with a concrete bottom and concrete blocks all the way to the surface as I never thought a muskrat would get into my system. I'll load some pictures of the finished product here soon.

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