Indoor pond liner

evilhorde

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Hello everybody,
I am starting to build my indoor pond and I have a question.
But first I will attempt to explain what I am trying to do.
I have a plastic pond liner, similar to this. Mine is a different shape and larger, but it is the same sort of thing.
15410.AD49060_4.jpg

It will be framed up to support the water load. I want to build a shelf, maybe 1-2 feet out, all the way around the circumference. On the shelf I will eventually have a dirt ring with plants growing. It will vaguely look like a lake in the center of a dead volcano.
lake-troitskoe-in-the-volcano.jpg

I said vaguely.
I will build a retaining wall around the outside to, well, retain the dirt hill.
I haven't decided what I intend to do for auto watering, but whatever I do, it will eventually drain back down to the pond.

My question and problem is: How do I seal the plywood and make the transition from plywood deck to plastic pond without my house getting wet?

My best idea to date:
I had thought to make the plywood deck height just an inch or three above the water height and then to use some sort of pond liner on the deck and let the end dangle down into the water. This should waterproof the plywood deck and direct the run off water to where it needs to go. Then I may cover the exposed edge with stones to conceal the last bit of unburied liner. Does this seem like a reasonable idea?

Assuming it is:
Can I use multiple pieces of liner and tape them together or do I need to find a single sheet large enough?
Will houseplant roots rip through a pond liner?
Liner recomendations?
Tips, tricks, or hints?


I have some unusual ideas for my pond including floating islands with ants and pillbugs, model railroad, Deserted towns and maybe a little stream. Actually the pond is an attempt to solve a problem with my vivarium. Dang fish are breeding and the fry are taking over the sump. The sump is painful to get into at the best of times and trying to catch danio fry is impossible. So I am going to use the indoor pond for the new sump and if the fry want to live in there, well it's okay with me.
Link to the Vivarium build.: Lurking no longer. - Vivarium Forums
 
I quickly made up a picture with 'paint' to try to illustrate what I am trying to say.
tubliner.png


This terrible picture is a sideview cross section.
The black line is the plastic tub or pond,
Blue is water,
Brown is the plywood deck,
Red is the pond liner,
Green is dirt, plants, and stuff,
Grey circles are rocks.

I would say that it looks good on paper, but I don't think any printer in the world is going to help it. Poor drawing skills aside, will my idea work?
 
Are you going to be pumping water onto the "shelf" area (ie, the part with the pond liner)? I'm not really understanding what you mean by runoff water.

How will the rocks stay in place?
 
I don't think I will be pumping a stream's worth of water on to the shelf, but I may. Most of the 'run off' will be drainage from watering the plants.

The rocks will be held in place by careful placement. I may use bricks, or stones or maybe even sacrificial wood or moss. Just so long as it conceals the plastic tub and liner.
 
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