Key:waterway/Narrow variants

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There was some discussion that waterway=ditch does not differentiate a waterway from a waterway=stream by size, but only by having been excavated by human intervention. Comparing the first and the last picture in the table below I propose that waterway=stream isn't suitable for the full range of differents streams. Some of these might well be man made, but the problem stays the same.

I have tagged some of the first examples as waterway=brook for now, until there's some sort of a guideline.

Image Approximate width Description Tags?
Brook02.png 20 cm An intermittent brook, just a narrow depression most of the time.
Brook04.png 40 cm An intermittent brook, just a narrow and possibly moist depression most of the time.
Brook06.png 60 cm An intermittent waterway, possibly just a moist depression part of the year. Ditch, brook or stream?
Brook08.png 80 cm A waterway filled with water most of the year, but could run dry in the summer. Ditch, brook or stream?
Stream10.png 1 m A stream filled with water year round. All but the elderly could just jump over it.
Stream15.png 1.5 m A stream filled with water year round. Not all would, but most people could still jump over it.
Stream17.png 1.7 m A stream filled with water year round. Most people wouldn't try to jump over it, even if many could with a running start.
Stream20.png 2.0 m A stream filled with water year round. Only few could jump over it.