Proposed features/Fire Hydrant Extensions (part 2)

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Fire Hydrant Tagging Extensions
Status: Voting (under way)
Proposed by: Viking81
Tagging: emergency=fire_hydrant
Applies to: Node
Definition: additional information for emergency=fire_hydrant
Drafted on: 2013-03-09
RFC start: 2017-10-21
Vote start: 2017-11-13
Vote end: 2017-11-27

Rationale

This proposals aim to conform the use of new tags for hydrants. It is a post-vote revision of Fire hydrant extensions proposal.

Dry hydrants

We discussed a lot about moving dry hydrants (= hydrants without pressure, where you need a pump with you to get water) in emergency=suction_point.
But this would involve a definition change of emergency=fire_hydrant, because currently a fire hydrant can be pressurized or not (distinguishable by fire_hydrant:pressure=# / suction).
But changing this meaning would create many issues, as emerged from discussion in tagging mailing list:

  • In some countries, pressurized hydrants and dry hydrants have the same shape, only their colour may change. There is 100% chance a not knowledgable mapper will use emergency=fire_hydrant instead of anything else.
  • 10% of hydrants in France don't have a type/pressure/water_source tag and the current meaning is "maybe with pressure, maybe not". The most common value for pressure in France is fire_hydrant:pressure=suction, this shows that this is a common case.

If you change the definition, all emergency=fire_hydrant would be assumed to be pressurized, but that wouldn't be true: error rate would be significant and this would be a regression.
So at the end we decided to keep the current definition of fire hydrant:
emergency=fire_hydrant is a device to take water for firefightening purposes. It can be pressurized or not (distinguishable by fire_hydrant:pressure=# / suction).
emergency=suction_point can be intended as a place where to park the fire engine to easily take water with your pump from a river, pond, lake... But a separate refinement proposal will be needed for it.

Proposal

Basics and advanced tags

Basic tags are:

All other tags are optional but are useful for firefighting purposes. If you don't know the data, simply don't use these tags.

Existing tags

These tags will remain unchanged:

Unchanged tags
Tag Description Valid values
fire_hydrant:diameter=* This is the nominal diameter of the flanged connection to the underground pipe that feeds the hydrant. In some countries you can read it on the pillar or on the signboard. # in mm, inches or letters.
fire_hydrant:pressure=* Pressure at which the water is supposed to flow through the hydrant. If the hydrant is connected to a pond/stream/tank/pool and a pump is needed to get water pressure=suction. # in bar, or suction if a pump is needed to get water.
fire_hydrant:position=* Position lane/parking_lot/sidewalk/green
fire_hydrant:count=* Number of hydrants, if there are more than one. Anyway it would be preferable to tag each hydrant with its own node (according the policy "one feature = one node"). #
fire_hydrant:style=* For special designs. wsh/.../
ref=* Reference number, if applicable.
name=* Name, if applicable. #

Revisions to fire_hydrant:type=*

fire_hydrant:type=* in its current form improperly conflates two concepts, the water supply (pond) and the physical delivery mechanism (underground/pillar/wall). We want to separate this two concepts in two different tags, introducing water_source=*.
Therefore:
fire_hydrant:type=pond will be deprecated because it will be replaced by water_source=pond.
fire_hydrant:type=pipe will be added for hydrants that are a simple raising pipe, without the usual hydrant shape.

Values for fire_hydrant:type=*
Value Description
pipe An hydrant consisting of a simple capped pipe.
Hydrants 20130326 112938.JPG
pillar A pillar type hydrant. If you want to be more specific, see pillar:type=* below.
Downtown Charlottesville fire hydrant 1.jpg
wall A wall-mounted fire hydrant.
Guentherscheid Tunnel Rescue4.jpg
underground A fire hydrant simple outlet located underground, underneath a metal cap. Hard to know anything about couplings, whench or sizes without opening the cap.

It is necessary to carefully look on the cap. There are other types of objects hidden below similar caps in some places like measuring points (e.g. labelled "GWM") or natural gas (labelled "Gas"). Hydrants are of course labelled "HYDRANT".

In Austria and Germany underground hydrants are of the same type. Inside there is not a normal coupling, but a bayonet coupling where the standpipe is locked in. The coupling should be Bayonet 70 mm all over the two countries.

Berlin hydrant 20050211 p1000517.jpg

New Tags

Note that most of the following tags haven't the fire_hydrant prefix. This is because they can be used on other features, for example on emergency=dry_riser_inlet (now is only proposed feature Dry riser inlet) , man_made=pipeline, natural=water, waterway=*.
For numeric values with units, see the guidelines: Map Features/Units

Proposed tags
Tag Description Valid values
fire_hydrant:awwa_class=* In the US, classification per American Waterworks Association. If flow_rate=* is present, this tag is redundant. AA, A, B, C
flow_rate=* Nominal flow rate. If fire_hydrant:awwa_class=* is present, this tag is redundant. # (numeric value) with unit of measure, in International System standard unit is m3/s. But for hydrants are preferable l/min (liters per minute), usgal/min (US gallons per minute), ukgal/min (UK gallons per minute), or m3/h (cubic meters per hour). e.g.: flow_rate=600 l/min.

In France, a normalized fire hydrant needs to supply 120 m3 during two hours. In the US, this specification is in Gallons Per Minute.
The use of usgal/min or ukgal/min instead of gpm is necessary because UK and US gallons are different.

water_source=* The water source for the hydrant. main, stream, river, canal, drain, ditch, pond, lake, water_tank, swimming_pool, groundwater, ...

"main" means a hydrant connected to a pipe which is fed by the local distribution network.
"groundwater" is for water wells.
This list may not be exhaustive. As a rule of thumb the value of water_source=* should repeat the tag of the related water source, if present (e.g. if the hydrant takes water from a source that is tagged as waterway=river then water_source=river, and so on).

water_volume=* Volume of the water reserve, applicable only to water tanks and swimming pools. # in m3. If another unit of measure is used, specify it
survey:date=* Date of the last site survey (this tag is not specific to fire hydrants). This means that someone observed the hydrant at this location on this date. This does not imply that a functional check was done at that time.

For the date of last functional check, another tag (not yet defined) will be necessary.

yyyy-mm-dd
colour=* The colour of the hydrant. Unless otherwise specified, the entire hydrant is this colour. blue, green, yellow and red are the valid values in the AWWA scheme, but many jurisdictions do other things
bonnet:colour=* Colour of the top section ("bonnet") of the fire hydrant if different from the colour tag value. blue, green, yellow and red are the valid values in the AWWA scheme, but many jurisdictions do other things
cap:colour=* Colour of the caps of the fire hydrant if different from the colour tag value. The caps are the covers over the hose openings. blue, green, yellow and red are the valid values in the AWWA scheme, but many jurisdictions do other things. If caps are painted in more than one colour, list all colours separated by semicolons
reflective:colour=* Colour of reflective material, if any (commonly stripes or bands around the barrel).
couplings=* Number of couplings. #
couplings:type=* Coupling standard. Bayonet, Barcelona, Guillemin, Klaue, Sprawny, Storz, UNI

More types are described at: https://en.wikipedia.org/wiki/Hose_coupling

couplings:diameters=* Each coupling diameter, separated by semicolons. #;#;# Always specify the unit of measure, normally use mm. For inches use ". In some countries characters A, B, C are used to specify the connector (Austria and Germany)

e.g.: taken this image & guessing diameters, this could result in: couplings:diameters=45 mm;45 mm;110 mm

pillar:type=* See below. dry_barrel, wet_barrel
disused:emergency=* See below. fire_hydrant
manufacturer=* To retreive information from manufacturers' documentation (this tag is not specific to fire hydrants).
model=* To retreive information from manufacturers' documentation (this tag is not specific to fire hydrants).

American Water Works Association colour scheme

Wet Hydrants are generally fed by water mains in urban and suburban areas. The dimensions of the mains vary greatly, and so the flow capacity of the hydrants can vary substantially. The location of hydrants is the first requirement in a mutual assistance call; the second most important piece of information is the flow capacity. Some jurisdictions in the United States have adapted a colour scheme specified by the American Water Works Association. In these jurisdictions, flow capacity may be determined simply by examining the colour of the bonnet and caps of a fire hydrant. In other cases, finding out the capacity may be more difficult.

Flow Capacities and AWWA Colour Scheme
Class Flow Capacity Bonnet & Caps Colour
AA more than 1500 US gal/min Light blue
A between 1500 and 1000 US gal/min Green
B between 1000 and 500 US gal/min Yellow
C less than 500 US gal/min Red

Adding pillar:type=* for pillar type hydrants

For better description of pillar hydrants, in addition to fire_hydrant=pillar you can add pillar:type=*

Values for pillar:type=*
Value Description
dry_barrel A style of pillar hydrant where the water shutoff valve is below ground, hopefully below the frost line. These are used on pressurized systems where freezing is a risk. They are occasionally used for dry hydrants when the water supply is higher in altitude than the hydrant.

The type may be determined by inspecting the caps: they are usually arrayed at the same level as there is no corresponding valve inside the hydrant barrel. The handle to operate the underground valve is ususally on the top (bonnet) of the hydrant.

Bethlehem 20130426 102052.JPG
wet_barrel A style of pillar hydrant where the barrel is pressurized at all times, with individual valves for each outlet. These are common in temperate climates, but not used wherever the temperatures may be consistently below freezing.

The type may be determined by inspecting the caps: each cap has a valve internal to the hydrant barrel and the handle to operate it is usually opposite to the corresponding cap. The caps usually are not arrayed on the same level, but this peculiarity, if alone, is not enough to identify a wet barrel hydrant.

Fire hydrant in Bonifacio Global City.jpg

disused:emergency=fire_hydrant vs in_service=yes/no

Previously it was proposed (but not approved) to use in_service=yes/no. But the prefix disused: is already used in other contexts and indicates the same concept. Therefore there is no need of the tag in_service=yes/no.
Hydrants are supposed to be in service by default.
If not, use the tag disused:emergency=fire_hydrant.

flow_rate=* vs fire_hydrant:flow_capacity=*

Previously it was proposed (but not approved) to use fire_hydrant:flow_capacity=*.
But a tag for flow rate can be useful for many other features (man_made=pipeline, waterway=river, waterway=canal, waterway=stream, waterway=brook, waterway=drain, waterway=ditch), so it is better to introduce a generic flow_rate=*.
"Flow rate" should be the most correct words in English for this attribute.

fire_hydrant:awwa_class=* vs fire_hydrant:class=*

Previously it was proposed (but not approved) to use fire_hydrant:class=*.
But it is not immediately clear to which standard this class refers to. Someone could use it for a non AWWA standard, expecially outside USA. So it is better to introduce fire_hydrant:awwa_class=*.

water_source=* vs fire_hydrant:water_source=*

Previously it was proposed (but not approved) to use fire_hydrant:water_source=*.
But a tag for water source can be useful for other features (emergency=suction_point and virtually others), so it is better to introduce a generic water_source=*.

Voting

Instructions for voting
  • Log in to the wiki if you are not already logged in.
  • Scroll down to voting and click 'Edit source'. Copy and paste the appropriate code from this table on its own line at the bottom of the text area:
I approve this proposal yes {{vote|yes}} --~~~~
I oppose this proposal no {{vote|no}} reason --~~~~
Replace reason with your reason(s) for voting no.
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If you want don't want to vote but have comments. Replace comments with your comments.

Note: The ~~~~ automatically inserts your name and the current date.


  • I approve this proposal I approve this proposal. --Josemoya (talk) 22:37, 18 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --EneaSuper (talk) 09:26, 18 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Ashtez (talk) 16:33, 17 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Viking81 (talk) 23:14, 12 November 2017 (UTC)
  • I approve this proposal I approve this proposal. AlaskaDave (talk) 00:06, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Dr Centerline (talk) 00:25, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Robkoch (talk) 06:07, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --SelfishSeahorse (talk) 07:53, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --MoritzM (talk) 09:32, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Miche101 (talk) 09:44, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. How it looks like now is way better. The remaining changes of tags are sufficiently explained. --Nakaner (talk) 10:53, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Thetornado76 (talk) 11:07, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --GeorgFausB (talk) 11:19, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. Marc CH (talk) 12:28, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. Wambacher (talk) 13:10, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Klumbumbus (talk) 17:47, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. Władysław Komorek (talk) 18:26, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. I would find a similar detailed proposal well for suction points, fire water ponds and water tanks. It doesn't matter if they have a connecting tube or not. --streckenkundler (talk) 20:34, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Whb (talk) 21:35, 13 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Bubix (talk) 10:34, 14 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Simone_girardelli (talk) 11:48, 14 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Miox (talk) 10:49, 14 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --corfede (talk) 10:55, 14 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Zonta72 (talk) 12:34, 14 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Ale_Zena_IT 12:39, 14 November 2017 (UTC)
  • I approve this proposal I approve this proposal. What a work done there. Thx guys Fanfouer (talk) 20:08, 14 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --NonnEmilia (talk) 22:47, 15 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Dieterdreist (talk) 10:01, 16 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --ToniE (talk) 21:15, 16 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --GOwin (talk) 12:11, 17 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Valerietheblonde (talk) 12:38, 17 November 2017 (UTC)
  • I approve this proposal I approve this proposal. Seems like a fairly extensive overhaul and always welcomed simplification of some tags. There is one case that doesn't seem to be quite covered yet, however. In Montreal, there are blue pillar type hydrants that are not used for emergency services to take out water, but to refill underground reservoirs used in the subway system (in case of an emergency in the subway, firefighters would connect their truck to a regular hydrant and pump its water in the reservoir through the blue hydrant. Any idea how to tag those? --Procrastigator (talk) 15:00, 17 November 2017 (UTC)
It seems a particular case of a dry riser inlet, although the blue pillar isn't used to rise water but to pump it undeground. See dry riser inlet proposal. --Viking81 (talk) 17:59, 19 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Michi (talk) 22:43, 17 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Zartbitter (talk) 20:27, 21 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --GPMapper (talk) 17:08, 22 November 2017 (UTC)
  • I approve this proposal I approve this proposal. --Claudius (talk) 17:12, 22 November 2017 (UTC)