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>> It's time for us to start working on the bottom drain.
So we're gonna show you the placement of where we need to put
this in the very floor of the pond.
My first bit of advice is I wanna get it right in the center.
As you know, we dug the pond in a perfect circle like an egg shape and
then everything is tailored down to the center of the pond.
So I've measured it out, we're about 14 inches.
I mean, 14 feet across, so I'm gonna mark half of that.
And then we are 16 foot long this way,
which is pushing the limits a little bit.
We talked about that.
I'm gonna come over to 8 feet.
So there's the center of the floor in the pond And
this is right where our bottom drain is going to be located.
Now the bottom of the pond is coned.
And actually, if I took a level and went back,
this is about where we are in the middle, so
to give you some perspective or it's about 12 inches.
We're 12 inches deeper in the center of the pond floor than
where the walls are connecting.
So the next step is for
us to dig this down because right here,
this is where our liner is gonna attach.
So the pond's floor needs to line up with right here.
So we're gonna dig this out and then we're gonna trench for the pipe.
We have a four inch pipe, that's gonna connect here and we're going
to trench this through the floor of the pond underneath the wall.
We'll tunnel underneath the wall and
this is going to take us all the way over to our settlement tank.
Now, if you'll notice my bottom drain is about
16 inches across and we dug around 28 inches.
We're gonna dig 28 inches.
So this will allow us to, once we get this down in here and
level, we're gonna pour a little bit of concrete around the bottom drain
to help stabilize it.
In rare cases, the bottom drain can heave below the pond If water
accumulates below the pond then the bottom drain can rise up and
push the liner up and that's called heaving.
So if we put an anchor of concrete around the bottom drain,
it will keep it secure all the way level with the pond floor right
exactly where we want it.
So we're gonna start jumping into this.
One other tip I wanna give you is when we trench this through
the wall, the pond floor is at an angle like so.
It's not level.
So we technically,
we could trench at an angle to get our pipe out of the pond.
And I see a lot of people do that,
cuz it's a lot of work to dig down deeper, but what we're gonna do
is we want this pipe that feeds through the settlement tank.
I want it level as much as possible.
Imagine gravity's working below water level,
things settle into the bottom drain and
then they are gonna make their way through this pipe.
Now if the pipe's at an angle, it's harder for
the stuff to go floating in the upward fashion.
So we're gonna get it perfectly level,
things will travel down the line and
as it gets closer to the settlement tank, then we can run some sweeps so
we can get the plumbing to tie into the settlement tank.
So the next step for us is to start digging this out and
we'll show you how we're gonna put the concrete around the drain.
If you'll notice the bottom drain is below the floor of the pond.
Now if I put a level across here,
you'll see it's about four inches low.
What this is gonna allow me to do is put concrete below the bottom drain,
so it'll be completely encased.
One thing I do want you to notice is we do have some plumbing coming
through the bottom as well and this is gonna be for our air.
We're gonna inject air into the bottom of the bottom drain and
that air will come up through this check valve and then we'll put
the dome on the top of here and the air comes through this dome.
So, I want everything to be encased.
I want all this to be encased in concrete, so we go ahead and
dig it just a little bit deeper.
Now the next thing for us to do is to run our trench for
the four inch pipe, that's gonna connect into the settlement tank and
that's where we're headed next.
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