Tag:water=stream
 water =
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| Description |
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The water covered area of a stream: a naturally-formed watercourse which is narrower than a river 
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| Group: water |
| Used on these elements |
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| Status: de facto |
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The water covered area of a stream, used with natural=water. Should contain a waterway=stream way inside.
This tag is not very common, because a waterway=stream is defined as a naturally-formed waterway which is narrow enough that an active, able-bodied adult can jump across it. Usually, the precise area of a stream is too narrow to be mapped unless there is very high resolution aerial imagery available.
Also see the more common tag water=river which is used to map the area of a river: a natural watercourse which is too wide to be jumped across.
How to map
Draw the outline of the stream and add natural=water + water=.
For long streams, the area should be split into several segments of manageable size.
In addition, a way 
tagged as waterway=stream, must be drawn in the direction of the river flow. All tags of the stream (like name=* and other supplemental tags) should go to this centre line.
Tags used in combination
intermittent=yes- when the water surface of a stream is only temporarily filled with water. This may or may not apply to thewaterway.