Relative to normal force.

Normal force, acting at any one point on a globe, perpendicular.

Therefore, quite easily, you can have 'level' water on a globe.

Fluid Dynamics even account for this.

But if we wish to misuse basic Fluid Dynamics, go for it.

It’s not so easy, when it’s neither observable, or measurable in real life. Two demands proof needs. And you can’t assume a measurement, without first observing.

No, but you observe that too.

Water finds 'level' relative to the normal force induced on it.

We do not observe water curving over a sphere.

Rather, normal force is its reaction to compressive forces of gravity.

We do, however.

Consider for a moment...

Why do we see the horizon further out when we raise altitude?

Which is disproportionally longer in distance

Than if we were at sea level, or even at 5,000'

The distance at which it increases is quite noticeable, up to a point.

Why is this the case?

We are supposed to see the horizon curve on a sphere.

That is the nature of every sphere in reality.

Earth doesn’t do that.

You didn't answer my question, though.

We are supposed to see farther when we elevate.

Why is that on a flat surface?

It would make no rational difference how far we can see from 5,000' to 25,000'

In fact, the distance is actually disproportionately higher at 25,000'

And yet you are not seeing further.

That horizon remains consistent on a flat earth.

So *why*?

A horizon is supposed to be consistent on a flat earth.

And yet it isn't in real life.

I’m sorry what?

The only difference you should see is equivalent to, say, Lat[axial] / Sin(Θ)

And yet, at sea level, you can see, what, 9 miles or so? Whereas the higher you go, the further beyond that limit you can see.

Again, up to a point.

How far are we supposed to see on a sphere earth?

At sea level?

Arguments like these just get redundant. Either you know the answer, and know it doesn’t match reality. Or you don’t know the answer, and might keep contesting, trying to explain why.

At sea level? For me it would be about 5,500m

In your case though, you haven't explained your answer to my inquiry.

Do you not know it? Or are just avoiding it?