[Talk-us] NHD accuracy on ski slopes (Winter Park, CO)

Ian Dees ian.dees at gmail.com
Wed Feb 10 16:37:53 GMT 2010

On Wed, Feb 10, 2010 at 10:27 AM, SteveC <steve at asklater.com> wrote:

> How accurate is NHD data?
> I have a lot of streams going approximately down ski runs in CO here:
>        http://www.openstreetmap.org/?lat=39.8671&lon=-105.7518&zoom=14
> (yes the ski runs need mapping too)
> There's no streams for many of those there in winter. I'm pretty sure
> summer is the same but I will check with people who know the area well.

Take a look at the nhd:fcode. If the fcode is 46006, then it should exist
year-round (perennial), if it's 46003, it should be marked as intermittent
(i.e. it might not exist in winter).

> If it turns out they don't exist, is it safe to kill them or might they
> actually be underground rivers now? And, does NHD know about underground
> rivers, and what should they be tagged if so?

NHD does know about underground pipelines, but underground rivers don't have
an fcode.
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