Thanks for the info.. The tank has a 1” threaded fitting on one side, near the bottom. I was going to attach directly to it, however after saying that out loud , the fitting is probably too small to begin with. So, it’s over the side.. I really don’t want to cut holes in the tank/liner. The bog tank is just mocked up right now, the blocks are just sitting in dirt, it will rise about 6 inches, and of course be level, once the footing goes in. Still considering a decorative wall about 4 ft tall between the bog and the pond, maybe brick or stacked stone.
I looked at custom one piece liners for $600+, but I found very little on seaming your own. I actually thought of that after seeing custom sized liners. The idea seamed doable but I couldn’t find enough specific instructions / results to invest money in materials.
It does get hot here, hotter the last 3 years than ever. In the july and august months we‘ve been seeing 105 -110 degrees in the day and only dropping to 68-72 at night. Not every day, but about 40% of the time. I sure hope the sun’s radiant heat isn’t too much.. The area will be about 50% shade in the peak of the day ( 2” lattice / 2” space ) So the UV may still be an issue at the area above the waterline, but somewhat reduced at least. I could create a denser shade, but the plants would suffer, and I think plants are a must. (Even considered grow light above the pond). It may be possible to drape a scrap piece of liner all around the hard top edge to shield the real liner.
Thanks Again,
Rich…
okay, I may be a bit confused, so straighten me out if I am.
You're trying to use the secondary, smaller tub for a bog. You want to take water from the pond (larger tub) and send it to the smaller, then have it overflow back, correct?
So to do all that, this is what I'd do; line each and make sure the bog tub is at least 6" higher than the pond tub. Make the bog liner long enough to drop 12" into the pond tub. Make sure the pond tub liner is 12" higher on the bog side and it can fold OVER the bog tub and UNDER the bog liner. This last is optional as you CAN just drop the bog water down into the pond tub but the above is more secure re keeping water inside the system. I hope that's clear. What this does is prevent wicking.
Make sure your bog tub liner is 6" higher than the bog water level as with time and clogging, the water level is going to rise and you don't want it to overflow your bog on the wrong side. You're going to need to alter the bog tub to create a weir (your waterfall) and it's here you can make this weir the 6" needed. Think of it like this; you cut a part of your bog tub out and the water rises then pours at this level, leaving your bog water level 6" lower than the remaining sides. Btw, your bog liner (and pond liner coming up if you go this route) is routed up and over and through this new weir cutout.
Now as for the plumbing; I like to keep all the plumbing inside my liners so if there's a leak, no water can escape the pond/bog system. The basic plan is to have a pump a bit off your pond bottom, send water via flex pvc up and over the bog wall (I'd put it in the cutout you created for your weir and NOT over the side, though that can be done. Putting it in the weir channel keeps all the water inside your system, should you develope a leak. This tubing then goes to the bottom of your bog tub to a manifold made from pvc or other pipe (I used 4" corrugated drain pipe), which has slits cut 1/3 the way through. The manifold lays on the bog tub bottom. Over this, you put some pea gravel. There's other more complex ways but this is the easiest; search for 'bog' here and you can see your other options.
The water will be forced to rise up through the gravel and since your weir cutout is lower, the water exits that way, over the edge, down the bog liner, and back into your pond. That's the basic idea. To hide this liner, you can get some Rock On A Roll or plan some other facia. Doing so means you'd have to construct a support for anything heavy you want in front of your bog liner to hide it.
It's simpler than it seems, you just need to figure out how to cover making the esthetics to your taste. You don't need the drain, imo, and can ignore it. You can also ignore the ratchet strap as the water will keep your liner in place, esp if you're planning on covering the top with any kind of heavy stone decor.
