Unbalanced water pressure on walls

[J1D]

For a swimming pool or water containing basin with an expansion joint, the water static pressure on one side of the basin is apparently not balanced. I wonder how to calculate the unbalanced pressure if a basin has an opening on a wall and the water falls down from the opening like a waterfall?

Thanks for comments in advance.

 

[JedClampett]

I'm not sure I'm clear on what you're asking. If there is water on one side of a wall and a different level of water on the other side of a wall, the pressure is caused by the difference in heights of water. It varies by elevation starting at zero at the top.
If there is a hole in the wall, water will flow from the side with higher head to the side with lower head. But that's a different problem.

 

[J1D]

Jed, the question is for a swimming pool-like basin with opening. No higher end, lower end. When the water is flowing out through the opening (not a hole, it is a segment of a wall), what would be the unbalanced water pressure? I don't know whether it is the same as the way to calculate the unbalanced static water pressure.

 

[BRIS]

I think you have a weir. You need to design for the worst case condition. Can the pool be empty on the downstream side ??

You need to clarify the problem!

 

[JedClampett]

If the water is on both side of the walls, there must be a difference in head to make water flow through the hole. this difference might be imperceptable, but it's there. One-tenth of an inch of head difference would create a large flow through a large opening, but not necessarily impact the wall's design. You might not even realize there is a head difference.
Basically, if there is a difference in water elevation between the two chambers, the wall must be designed for it. But if it's very small, it may be ignored.