Hello!

Can I ask where the name "plavūpe" is from for https://www.openstreetmap.org/way/1203087391?

This is also almost certainly not a river. It could be considered a stream, but it's most likely just a ditch. I'm not sure how you are measuring the width, but it's definitely not 5 meters wide water.

Also, tidal=yes shouldn't be specified on any water bodies so far from the coast - none of these are affected by the tides.

The geometry of https://www.openstreetmap.org/way/1203090258 looks incorrect - it's drawn almost on top of the road but the road here is 2 lanes wide.

I fixed some other issues with waterway relations. Notably, there are no tributaries or springs here.

I'll leave some additional comments on some other of your changes.

Thanks

P. S. I can reply in Latvian or Russian if English isn't the best.