Creating a River

What I'd like to do is create a river something a lot like is in BDX_Breach where there are multiple animated layers, a mesh which isn't a simple flat plane, and extra 'rapids' where other meshes (like the bridge supports) are placed.

Since all of these materials are in the game somewhere, I imagine it should be possible to recreate this effect without needing new assets (besides a new mesh for the particular shape of my river.)

Does anyone have a tutorial/steps which would cover creating something like this?
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