I'm currently doing mapping for the island of Maui in Hawai'i.  The leeward
side of this island has a large number of streams that are dry nearly all
the time, only containing water during periods of heavy rain.  On maps,
these streams are often depicted as dashed or dotted blue lines.

Is there any existing tagging convention for such seasonal or dry streams?

A typical example of such a dry stream can be seen in the satellite images
at this location:

http://www.openstreetmap.org/?lat=20.62645&lon=-156.20935&zoom=17&layers=B000FTF

-Scott

-- 
Scott Atwood

The hill isn't in the way, it is the way.
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