Adding a bog to an existing pond


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I'm having trouble envisioning how to contruct the point where the water flows from the new bog into the existing pond.

My pond is 1500 gallons with EPDM liner.

I was thinking about getting a small piece of liner for the bog and have it overlap into the pond. I'm guessing the bog liner will have to be pitched toward the pond.
But how do I keep the bog material ( pea gravel, etc ) from washing out into the pond?
Don't I need some type of perforated wall or other material to allow just the water to pass through? Can I achieve this with one or two PVC pipes? But again, how do I filter the pea gravel out?
 

mrsclem

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Your bog is basically a small pond that is a little above your pond level. The water moves via a low point from the bog to the pond.
 
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JBtheExplorer

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Your bog is basically a small pond that is a little above your pond level. The water moves via a low point from the bog to the pond.
Somewhat like this.
bogg.jpg



As far as keeping the pea gravel from being moved into the pond, I use larger rocks to hold it.
 
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Mrsclem, thanks for the response. I understand the concept, but I'm worried that the contents of the bog will wash out into the pond.
I just came up with an idea...I can pile up a bunch of large stones higher than the pea gravel along the last foot or so of the bog. This will act as a barrier that will only let water through.
 

mrsclem

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You can control how large of an area flows back to the pond. You can go entire length of bog or just a small area. I use a 10" chimney flue liner as a spillway.
 
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You can control how large of an area flows back to the pond. You can go entire length of bog or just a small area. I use a 10" chimney flue liner as a spillway.
Thanks again. I was wondering what material your flue liner is made of ( terra-cotta? ) and how you incorporated it into the transition between bog and pond.
 

addy1

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My bog is around a foot higher than the pond. I have a wall between the bog and pond covered with liner, a waterfall rock around 3 feet wide is the flow back into the pond.
 

ashirley

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I am so happy you asked this question! I am thinking of adding a bog to mine but was going to use a stock tank. I know that the return needs to be below the top of the gravel but I am struggling with how to get the water back into the pond.
 

mrsclem

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I'm a little confused by you saying the return needs to be below the gravel. The water flowing in needs to be below the gravel so it's an up flow system. A 3-4" pvc pipe fitted near the top of the stock tank could serve as your return.
 

ashirley

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I'm a little confused by you saying the return needs to be below the gravel. The water flowing in needs to be below the gravel so it's an up flow system. A 3-4" pvc pipe fitted near the top of the stock tank could serve as your return.
I thought that the return pipe needed to be below the top of the gravel as well so that the water has to work through the gravel to return to the pond.
 
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My bog is built from lumber so notched out a section and fitted liner into the notch. Secured with PL roof cement.
Great, the notch is leak proof since the liner covers it. Good thinking!
I'm itching on doing this bog! Spring fever I guess.
Still snow on the ground here in northeastern PA, but it just hit 60F degrees! Hasn't been that warm here in quite a while.
 

mrsclem

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Still trying how to put a bog on a 5' deep above ground pond! Right now using window box mini bogs.
 
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Still trying how to put a bog on a 5' deep above ground pond! Right now using window box mini bogs.
How about a stock tank with a wooden frame or table under it. The support would need to be strong obviously.
Or just build something out of wood and put underlayment and liner in it. Probably be cheaper than a stock tank.
 
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mrsclem

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I currently havery a 150 gallon stock tank I am using as a filter. It's the right height but would need to be moved closer to the pond. I have another 55 gallon filter around here somewhere that I could put into use. The very thought of buying more pea gravel and carrying down there makes me hurt! 11 window box bogs do good once they get going.
 

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