[Tagging] fire_hydrant extensions proposal

Richard Welty rwelty at averillpark.net
Mon Mar 11 12:29:57 UTC 2013

On 3/11/13 7:25 AM, Andreas Labres wrote:
> Richard,
> On 09.03.13 20:07, Richard Welty wrote:
>> i've started drafting a proposal for some tags to extend the fire_hydrant
>> tagging system.
> Please keep in mind, there already a rather big list of possible tags:
> http://wiki.openstreetmap.org/wiki/DE:Tag:emergency%3Dfire_hydrant
> (only in German) and what the OpenFireMap displays (the diameter):
> http://openfiremap.org/?zoom=17&lat=48.11435&lon=16.31743
i don't propose to change those tags, only supplement with tags
relevant for US usage and possibly expand the suite for other locales
where the usage is different. the internal diameter of the hydrant is
not the dimension in common use in the US. in the US, usage is not
standardized but departments generally think in terms of one of these

1) American Water Works Association classes (AA, A, B, C). this is a
      simple coding system for flow capacity

2) flow capacity in Gallons per Second

3) water main diameter (not hydrant diameter)

internal hydrant diameter isn't going to play in the US, nor is pressure
in bar, hence the proposal for extending the tagging system.

i would also note that in the UK, according to the docs i've reviewed,
the diameter recorded on the hydrant signs is the main diameter,
not the internal hydrant diameter.


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