Once upon a post there was a handy solution to the origiinal request...
@unknownuser said:
Ok, let me tidy this thing up, set up an animation plan and I'll get back to you.
...but from the very next post forward it went very bad. All the chatter in the background seems to have spoiled a good thing. At least I would have enjoyed creating a little animated piece for you. It has been a while since I made that kind of offer.
Once upon a time my suggestion would have prompted others to try their own hand at an example with their own tools. As you know....a picture...a thousand words,,, and so on.
That didn't happen.....things have changed.
There is a lot for you to learn to pull off this animation whether it be Lumion or Blender. To suggest 3 days is going to get you satisfactory results is not realistic.
Anyone who has created the scene you have described and animated it, including water effects will say that it is very advanced and tedious work.
If it does become a priority for you to complete this work I still offer free Lumion advise when and if you buy a licence. I have no affiliation to Lumion. I just enjoy unusual projects.