The tag water_works=* is great for use with man_made=water_works - but that's for treating water before it is used, not for treatment of sewage, normally: "water works is a place where drinking water is found and applied to the local waterpipes network."
But there is also https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dwastewater_plant - man_made=wastewater_plant so perhaps the key wastewater_plant=* would be appropriate, e.g.: landuse=basin + content=sewage + wastewater_plant=decanter for your example? I note that the page suggest using "water=wastewater" in this case instead of water=basin or water=reservoir: https://wiki.openstreetmap.org/wiki/Tag:water%3Dwastewater - "A clarifier/settling basin of a wastewater treatment plant" - used >32,000 times and pretty widespread globally: https://taginfo.openstreetmap.org/tags/?key=water&value=wastewater#chronology - https://taginfo.openstreetmap.org/tags/?key=water&value=wastewater#map -- Joseph Eisenberg On Thu, Dec 17, 2020 at 3:07 PM François Lacombe <fl.infosrese...@gmail.com> wrote: > > > Hi Joseph, > > Le jeu. 17 déc. 2020 à 20:16, Joseph Eisenberg <joseph.eisenb...@gmail.com> a écrit : >> >> I don't think mappers can know the maximum volume or capacity of a water reservoir or water basin, unless it is written on a public sign somewhere? We can map the surface area, but knowing the average depth or maximum depth is quite difficult, especially when it is not uniform. However for man_made=reservoir_covered and =storage_tank we have capacity=* (in cubic meters?) and content=water/sewage/etc. > > > volume, elevation would be optional and mostly got from local signage. > You may have opendata, knowledge or sometimes measurements. > Many tags are already available but not used at the proper extent. > For example, if we add capactiy (in cubic meters) on a waste water basin, we could do the same for man_made=covered_reservoir or even water=reservoir (if information is available somewhere) > Look at this water tower hunting website giving many details from ground http://chateau.deau.free.fr/rdef/PagesHTML/Sommaires/GermanDossiers.html > >> >> The usage is not often tagged yet, since this might be hard for a mapper to know. > > > Regarding waste water basins, it could be useful to distinguish > - sand traps > - oil separator > - floccuation > - decanter basins > - aeration tanks > and so on... https://www.horiba.com/fileadmin/_migrated/pics/Wastewater_Processing_E_.jpg > That looks complex but easilly guessable from aerial imagery or even clearly explained during public visits of facilities. > We could define simpler values if it helps > >> >> Currently for landuse=reservoir and water=reservoir this is some use of reservoir_type= - https://wiki.openstreetmap.org/wiki/Key:reservoir_type - with values of water_storage, sewage, tailings, evaporator, tank, salt_pan, wastewater, slurry, irrigation, aquicultura, cooling, etc - though only the first 4 are at all common. >> >> basin=* is used with landuse=basin or water=basin to describe the form and function of the basin: >> >> basin=infiltration - An infiltration basin catches storm water and allows it to seep into an aquifer. >> basin=detention - A detention basin catches storm water and allows it to drain slowly into natural waterways. >> basin=retention - A retention basin catches storm water and retains it, forming an artificial pond. >> >> >> And note that salt ponds (used to evaporate salt from sea-water) are tagged as landuse=salt_pond >> Pools for swimming are leisure=swimming_pool >> >> I don't see many combinations with usage=* or another tag that might describe how the reservoir or basin is used, so perhaps this could be proposed? > > > > That's right, usage=* corresponds to large familiy of activities and more specific tagging would be more suitable to describe precise purpose of a particular basin > reservoir_type and basin looks like to refer to reservoir/basin purpose but mixes may concepts that may collide (irrigation is a water_storage as well) > Only some values would match with usage=* ones: usage=irrigation is used 12k vs reservoir_type=irrigation 50 > > Waste water processing could be described with less used water_works=* > man_made=basin (An artifical structure designed to store some fluid, you find basins for storm/rain/radioactive water, sewage, oil, ...) > content=sewage (Let's put waste water inside) > usage=industrial (It's part of an industrial process) > water_works=decanter (It's an actual decanter) > capacity=xxxx > > I'd find great to use water=* with content=water, substance=water or natural=water only. > > That's my 2 cents, let's refine it > > All the best > François > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging
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