could/should I add a bog?


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What I would do is build it up a bit 10 inches or more above the pond edge. Tuck the new liner OVER the pond liner. The water will waterfall into the main pond and most likely will not leak.
That’s kinda my plan here. I was just thinker tuck under because of how funky the edge of the liner is where it was attached to the biofalls. Here’s a pic of the front/pond edge of the bog box. I was gonna use one row of timber and dig down from there because if the odd shape I need I thought it’d be hard to build a structurally strong box on site

9DC888F4-9392-4CAD-B94B-5DD82B3C881F.jpeg
 
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What addy said...you want to lay the new liner OVER the old liner. If you do it the other way, the water will flow under the old liner.
Make sure you have good amount of liner overlap. What I have done is laid my new liner over the old one with enough overlap to reach into the pond water. Before you lay the new liner, try to build up a slope of soil under the old liner pitched toward the pond. I would even shape that soil mound in a concave fashion for extra insurance to guide the water away from the edges and down into the pond.

Here's how I transitioned my new bog liner into my existing pond:
20200425_123444.jpg


In the picture below, you can see the old liner goes up and over the new transition wall between the bog and pond. I was lucky, I had plenty of old liner that used to be under my old waterfall.
20200425_120457.jpg

Almost done in the picture below:
20200521_140627.jpg
 
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That’s kinda my plan here. I was just thinker tuck under because of how funky the edge of the liner is where it was attached to the biofalls. Here’s a pic of the front/pond edge of the bog box. I was gonna use one row of timber and dig down from there because if the odd shape I need I thought it’d be hard to build a structurally strong box on site

View attachment 129106
That's great!
Lift the old liner and pack soil in there to create a slope away from that timber. Pack it good and make it concave shaped as I stated in my previous post.
Try and think ahead and shape that packed soil with some sort of shelves too. This way when you lay your liners, you'll have a stable base to stack large stones to hide the liner for a more natural look. You don't want a big ugly unnatural black liner eye sore.
Here's a couple more ideas:
I personally have never used it, but some people have used the black waterfall spray foam to hide the liner. They spray it on and stick small stones and sand into it before it hardens. I don't know how durable that stuff is. I'd worry about it peeling and only use it minimally if necessary at all.
Then there's the rock on a roll stuff. Basically liner material that comes in different natural looking patterns. Maybe you can buy a small piece just to cover the falls area. Lay it over your new liner just in that exposed area. It will just be for looks and not serve as a liner.
 
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So in looking at this, if I only go one or two rows high of timbers I could pull the old liner up over the lip of the bog box. Then I put in the bog liner and lay it over the top of the old liner and down into the splash zone/rock shelf that already exists. Put the splash/landing rocks on top of both liners there. Would I need to seam the two liners then? Or would I be safe with the overlap? The pond level even when really full doesn’t reach up to where the timbers are now
 
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You won't have to seam it, especially with that amount of overlap and the fact that it reaches all the way up and over the timber.
Just make sure to shape the soil under the liners in a concave fashion so the water can't escape over the right or left sides before it reaches the pond. Remember, water will seek the path of least resistance and you (of course) want that to be down and into your pond.
 
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Try to create a nice wide notch in the center with the timbers. This will be the height of your water level. The water will flow through the notch. You don't want it flowing over the whole width of the timber you have there now. It will escape over the sides. When you add the second tier of timber, use two short pieces, creating the notch in the center. You probably realize this. I don't mean to sound condescending, I just wanted to make sure.
 
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Try to create a nice wide notch in the center with the timbers. This will be the height of your water level. The water will flow through the notch. You don't want it flowing over the whole width of the timber you have there now. It will escape over the sides. When you add the second tier of timber, use two short pieces, creating the notch in the center. You probably realize this. I don't mean to sound condescending, I just wanted to make sure.
Not condescending at all, no worries. Thanks for all the advice!
 
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I wish it could be bigger. And problems if I turn the corner behind the shed with the bog? I’m a little concerned that the water wouldn’t flow all out the low spot in front. But it would have to wouldn’t it? Even if that meant turning a 45 degree corner to do so? I have plenty of liner. As shown the bog is 3’ wide and 5’ long. I have a 10 x 15 liner for the bog.

AB10C72A-31D9-498C-B179-27F5FF0C004F.jpeg
 
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I wish it could be bigger. And problems if I turn the corner behind the shed with the bog? I’m a little concerned that the water wouldn’t flow all out the low spot in front. But it would have to wouldn’t it? Even if that meant turning a 45 degree corner to do so? I have plenty of liner. As shown the bog is 3’ wide and 5’ long. I have a 10 x 15 liner for the bog.

View attachment 129111
You are doing great and keep the pictures coming!
Don't worry, the water will seek it's level and flow out of the "notch" (or low spot) by the pond. Make sure your bog walls are at least a few inches higher than the water level. Try not to trim the liner. Fold it over and stack rocks or lumber on top. You never know when you might need more liner.
I stacked rocks on top of the gravel all along the sides against the liner to hide it.
 
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It might be a good idea to drill holes in the timbers and hammer rebar through into the ground for anchorage. A little extra insurance for possible shifting.
 

addy1

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And problems if I turn the corner behind the shed with the bog?
None, water will flow out the low spot. But like said keep the liner uncut, a year or two after I built mine I had to unroll the extra liner for the rise in the water level. As roots grow, as gravel settles as who knows the water gets higher.
 
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addy1

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It might be a good idea to drill holes in the timbers and hammer rebar through into the ground for anchorage. A little extra insurance for possible shifting.
We did that with our 26 foot long timber bog wall. Drilled holes and pounded the rebar through them. With our wall we also did cement columns at the end, but we have a long wall and it was 3 foot tall.
 
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What I would do is build it up a bit 10 inches or more above the pond edge. Tuck the new liner OVER the pond liner. The water will waterfall into the main pond and most likely will not leak.
old under new ...... or new over old ....and it sounds like your overlaping not seaming
 
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old under new ...... or new over old ....and it sounds like your overlaping not seaming
As it turns out, I can bring the old liner up over the lip of the bog wall. Would you advise still seaming? Or can I get away with overlapping?
40F96D3E-2083-446B-9C77-BBF40A5F9E15.jpeg
 

addy1

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I think your overlapping will work just fine.
 
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I’ve hit the wall for today. Will be back at it in the morning....but this is the rough shape of the bog. Need to finish the top layer of timbers but ran out of rebar so off to the store.

EAAF0E14-AA7B-4026-85B0-7C0772C0C4FF.jpeg
 

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