How to keep elements outside the top of the pool?

Continuing the discussion from Support for vertical modeling (pool)?:
I was imitating the horizontal pool to make a vertical pool, but encountered many problems in the process.I don’t know why the element is at the top of pool, I don’t know which file I can change.

In addition, in the process of doing the vertical pool, there are some calculation methods, I don’t know what they mean, do I need to rewrite the algorithm for the vertical pool?Such as:

Thank you very much!

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Thanks :heart:

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