On 09/03/13 19:07, Richard Welty wrote:
i've started drafting a proposal for some tags to extend the
fire_hydrant tagging system.
i have a question for the non-US mappers...
in the US, the American Water Works Association has a classification
system dividing
hydrants into 4 groups based on their flow capacity (e.g., class AA is
output greater
than 1,500 gallons per second.) is there any equivalent in other parts
of the world that
should be factored into the tagging scheme?
for the US, GPS is the normal flow capacity unit. i presume that
liters per second is the
norm elsewhere. correct?
for the US, water mains are specified in inches. i presume that
centimeter is the correct
unit elsewhere. correct?
In the UK, hydrants are almost also below ground level, with a cover to
gain access. Nearby there is a yellow sign with a characteristic 'H' in
black on the sign. There are two numbers: the upper is the diameter of
the fitting usually now in millimetres but there may still be some in
inches, the lower number is the distance in whole metres (or yards) from
the sign to the hydrant cover. The water flow rate is determined by the
local water pressure and the diameter of the pipe fitting. This is not
published, as it seems are the location of the hydrants :-)
http://chris-osm.blogspot.co.uk/2012/05/fire-hydrant-locations-are-confidential.html
--
Cheers, Chris
user: chillly
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