You will not believe this: Arapaima Gigas in our stormdrain

Thanks for the comment. It's funny indeed, petting your fish. He is a big fish, so damaging is not likely unleash you go slapping..lol.
For the big pond, lot of things to sort out. Houses are piled with concrete skeleton construction, so any wall can be removed and changed at will. Just stay away from the frame and you're ok.
Thing is, house is about 15 yr old. The ground seems to be stable now, early years there was substantial sinking of the land around the houses in my area.
However, we are in a river delta with a very high water-table. With recent flooding, water just pushed through the seams of the concrete base plates for the kitchen floor. So you can imagine that we have a very 'fluid' underground, in other words, there is quite some upward pressure from the water table.

The pond with water in it, will have a downward pressure of roughly 1500 to 1800 kilogram per square meter. For starters, I need to ensure that it will not crush the drains from the back of my house to the front.
1 solution could be to have 2 separate concrete structures with the area over drain pipe free, imagine it as a shoebox cut in half and separated leaving the opening free. Then the liner goes over it. When the pond does sink a bit, the drainpipe stays as is and the liner has some extra space to account for the sinking.
With the liner, this might be the easiest way to not press the drain down.
Of course, everything will be free, not attached to surrounding walls.
 
Is the water table high enough to create a permanent pond without the liner? (curious)

As for pipes... in the extreme you could move them around the pond instead of under/through it (unclear on that). I do like the sounds of the "cut in half" shoe box, that would allow it to flex more then a solid single piece would. I'd just be worries about tearing through the liner if something was to go wrong...
 
Is the water table high enough to create a permanent pond without the liner? (curious)

As for pipes... in the extreme you could move them around the pond instead of under/through it (unclear on that). I do like the sounds of the "cut in half" shoe box, that would allow it to flex more then a solid single piece would. I'd just be worries about tearing through the liner if something was to go wrong...

For the liner, I will allow stretch area. Some extra liner that's folded in like a harmonica over the pipe. Stuf does go down, then it will pull the liner more straight.

For the watertable, too bad it is at times high enough but the dry season would sure empty it. Besides, this area has been filled in with dirt before construction. God only knows what's in there. It's Thailand after all.
Rerouting the drain would be difficult, the stretch is too short. Only like 15 meters from start to the street line. It's a slighty sloping straight pipe with two Thai size manholes lol.

Had my contractor in to first make an estimate. Then I will get that approved by my boss,...or not.
Next step is then to get blue prints of the house, find a qualified engineer to check and approve the plans.
Once that is done and we are sure it's safe, then we will work out the details.
After that, breaking ground. Given the speed my contractor normally works, builind it will be finished in no time.
 
My contractor came in to drop of the drum for the temp filter.
When we talked about the pond he at first thought I was joking.
But then, he liked the idea of the half shoe-boxes.

He renovated my house last year. Does not do half work. Pretty sure he will come up with a solution that works. Piling under it, strong slab to avoid breakage of the bottom, etc. Hard to find contractors here where you know for sure that the end result will meet your demands.
 
Checked in this morning. Changed water yesterday, crystal clear and he is active. Waiting for prawns, but will only arrive afternoon. Next week will try dry food, pellets...maybe mix with prawns..
 
Well, good luck with the design, once you've got that the rest will be cake I hope :)
 
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