First Pond Excitement!

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Thanks @addy1 and thanks for modding this forum. Question for you and all: When I bring the skimmer pump in for the winter won't the bog water push down through the bottom manifold and equalize with the pond water level? That would leave just 5" of water in the bottom of the 12-14" deep bog. Will that kill my young, hardy plants (the taro is doomed in zone 5 of course)? Should I retrofit my plumbing with some sort of removable junction fitting to break the siphon and keep all the water in the bog?
 
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addy1

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Mine stays full of water, it does drop a bit below the gravel level. But not much. I think if the water goes that far below the plants they will die. The gravel will dry out. Mine freezes up hard.

I have mine built so it can not drain back down. The input line is above the level of the pea gravel, or right about equal to the level. Then it goes down to the manifold level.
I turn all off for the winter, my pump is external. Open the lines, leave any water in them that is there, pull the pump and so far, 9 years now, have not loss any pipes.

My pond is build on a slope so it was easy to build it this way without a lot of lines sticking up. The down slope side of the bog is a 8 foot berm of dirt built to make the land level.
 
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Good to know. Yes, my input line is above the gravel so should be fine. It comes up and over the bog wall down to the manifold. I used white pvc and painted it for UV resistance and to match the block walls. The bog will freeze up solid over winter. Btw I planted arrowhead sagittaria, blue pickerel, Louisiana iris, water celery, Chinese lizard's tail, variegated rush and variegated sweetflag. 6 small comets and shubunkins were added after Prime conditioning and beneficial bacteria. Now, 7 weeks later the parameters are good and water clarity is stellar. The pond is about 600 gallons, 200 gallon bog about half of which I suppose is water.
 
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If you drill a hole in the pipe at the top of the gravel just above the stone when you shut down the power or if you were to loose power it can create a siphon break , and prevent the water from draining back to the pond.
 

addy1

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Mine has never drained back. So far.
 
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If you drill a hole in the pipe at the top of the gravel just above the stone when you shut down the power or if you were to loose power it can create a siphon break , and prevent the water from draining back to the pond.
Not quite visualizing this. Can you get a bit more specific for my physics challenged self? Thanks
 

addy1

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the pipe goes under the pea gravel, a small hole (red) is drilled in the pipe to break the water flow when the pump is not running. Air gets in the pipe and the water flowing out of the bog is stopped. No siphon happens.
cap.JPG
 
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Interesting. I would think that you would have a fountain from that hole while the pump is running. Hmmm
 

addy1

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Interesting. I would think that you would have a fountain from that hole while the pump is running. Hmmm
I did it once, long time ago, had a dribble come out.

I was thinking this out, I do have a Y that feeds a garden hose that feeds three ponds. So when I turn off my bog for the winter or a power out, the hose is basically a open air line. So that would be my siphon fix.

I pump around 6500 gph into the bog, minus the bit to the small ponds and a bit to the stock tank.
 
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OK, so a small hole like 1/8" placed such that the (minimal) dribble during pump operation falls into the bog? Would removing the cap of my vertical cleanout pipe break siphon? Of course, that wouldn't take care of the power outage scenario.
 
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We have a ball valve on the bog so we can stop back flow. Most of the water stays in the bog even with the pump off, but it was a "just in case" plumbing decision during our build. We also have that thing that doesn't allow water to flow backwards to the pump (the name is escaping me right now... very common piece... not a hard word... ) CHECK VALVE! haha! We have a check valve just ahead of the pump so the water from the bog can't flow back to the pump. But if we have to disconnect the pump for any reason the bog will empty back to the pump vault unless we shut the valve at the bog.
 
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I placed a tee in my plumbing at the high point, placed aproxamatly 8" of pipe and the airvent valve on top of that. I used the plumbing vent shown.
Screen Shot 2019-09-10 at 12.35.05 PM.png
 
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Thanks @Ronfire that's an interesting solution. I have yet another question for y'all. Thanks for being patient with this newbie.
My pond is only 600 gallons and the bog is 200 gal. The pump inside my skimmer is 2000 gph. I would like the pond water to spend more contact time with the bog gravel and plant roots before returning to the pond. There is too much surface turbulence and the water lily does not look happy. If I install a ball valve and close it just until I am satisfied with the flow rate will that cause damage to the pump?
Also, I have a fibrous filter pad that came with the skimmer. Should I use it to filter out the fine debris after the net catches the leaves? Would that be starving the bog?
 
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I only use the basket and the leaf trap before the pump to prefilter before sending the water to the bog. If the pad is a course pad and would allow the fish waist to pass would be good but you bo not want to filter out the finer waste to the bog and starve it. You can valve down the pump but a better option might be to put in a Tee with a valve on each line and send the extra water to another water feature or a return line to the pond like a "tangent pond return" or similar. Another option that I did was to add a sand and gravel filter and use it to collect some of the fine particles in the water, mine runs maybe 20% of the water flow, dont think that will starve the bog with my high fish load. My bog is larger than my pond but seams to be doing ok for the 4 months it has been running.
 
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addy1

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I only use the basket and the leaf trap before the pump to prefilter before sending the water to the bog.
I only use a leaf trap, which seldom needs cleaning. I do not draw water from the bottom of the pond, my pump intake is around a 1.5 feet off the bottom.
 
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