What is this constant latent megalomania with you? 4K camera, infinity pool, six-figure outdoor facilities ... I’m not Jeff Bezos.
I just look like him, but I’m not. :D
It is not insignificant in the whole matter to not make the calculation without the host - that is to say: the lower-lying neighbors who are to be spared from the surface water flowing away.
Don't exaggerate. The water used to flow down the slope before. The L-shaped stones rather prevent the water from immediately flowing to the neighbor.
It's better if you show us the plan of your property, the building application with the surveyor's indicated heights.
I didn't get one with heights, we also had an exemption procedure here, maybe that's why. But it wouldn't help anymore since major changes have already been made to the heights.