Hi!

Just wanted to let you know that local melioration and ditch system waterways should almost always be ditches (rather than streams or canals) For example https://www.openstreetmap.org/way/1255567865 . Generally, there are very few canals in Latvia (these are larger man-made constructed waterways, normally with built-up banks). And most streams are much longer. Unless you know there's a spring or something at the source, then it's probably not a ditch.

Thanks