Why don't we have a tag for smalll freshwater channels?

The issue here are small freshwater channels not too wide to jump over, similar to waterway=stream, but not from natural origin. The physical appearance is the same like waterway=ditch, but they are carrying freshwater instead of exess or waste water.

Gutter has been used already for very small prefabricated channels as discussed here: Tagging of a steel gutter inlet