I'd be inclined to go for used-defined tags. The existing tags do not
accurately describe the feature, and are at best misleading. A suggestion:
emergency=water
water=tank
As far as capacity is concerned, I'd opt for the standard unit for
measuring large water volumes - megalitres (ML).
1 ML = 1000 cubic metres exactly.
In my experience, large water tanks are never stored under pressure.
Rather, the water surface is at atmospheric pressure, and the position
of the tank on a hill provides any pressure to taps below it. So the
lack of pressure is a given.
A large tank under pressure could be a dangerous thing.
John H
On 30/10/11 14:46, [email protected] wrote:
I've come across some large water tanks for fire fighting purposes, and
was wondering what exactly to tag them as.
I've found a few in the Kinglake area, there's a few more to put on the
map too.
Pictures of them:
http://imageshack.us/photo/my-images/843/20111022040.jpg/
http://imageshack.us/photo/my-images/510/p1020609n.jpg/
Where some of them are:
http://www.openstreetmap.org/browse/node/1476005382
http://www.openstreetmap.org/browse/node/1472743040
Best-suited tag that's not quite spot-on:
https://wiki.openstreetmap.org/wiki/Tag:emergency%3Dfire_hydrant
What I'm wanting to know, is what should I call the fire_hydrant:type
tag?
I've temporarily put down "tank", but maybe it should be "reservoir" as
proposed in
http://wiki.openstreetmap.org/wiki/Proposed_features/Fire_Hydrant
Next thing would be to tag the capacity (or estimated capacity), which
would be in meters cubed, estimated by doing a
(pi*radius*squared)*height
And perhaps a tag to say that the water is not stored under pressure,
and would probably require a pump.
Any suggestions would be welcome. Otherwise I guess I could contact the
CFA up there for ideas.
_______________________________________________
Talk-au mailing list
[email protected]
http://lists.openstreetmap.org/listinfo/talk-au
