Am Do., 27. Feb. 2020 um 01:33 Uhr schrieb Joseph Eisenberg < joseph.eisenb...@gmail.com>:
> > Christmas trees are intended to regulate the well pressure or manage > filling product injection to raise field pressure. > > You'll find them independently on oil or water wells depending on the > pressure. > > Very few water wells have high enough pressure to require such a > device. 99.9% of water wells are a few meters to a few tens of meters > deep, and most of those that are mapped in Openstreetmap are in > low-income countries where they will have a manual pump on top, or a > bucket that goes into a hand-dug well. > pumps and buckets are typical for all smaller water wells, and from looking at the map, it doesn't seem a tag that is used more in lower income countries than in richer countries. https://taginfo.openstreetmap.org/tags/man_made=water_well#map Water wells are typical for all areas where the people want or have to be independent from the public water supplies (e.g. in private gardens where the public aqueduct is too far away), or where it is the only source of water (no aqueducts). > > Tags in Openstreetmap are designed by ordinary people for mapping the > usual situation. They do not need to cover the 0.1% of cases that are > strange exceptions or outliers. > tags in OSM are designed to be universally applicable. A tag for a water well would usually apply to all kinds of water wells, including those with higher pressure and regulating devices, unless it would have been excluded in the definition (or we all agree that it is fundamentally differerent and not covered by the definition / expectation). The current water well definition states: "A water well is a structural facility created to access ground water from an aquifer. It is a vertical or sometimes horizontal excavation, shaft or structure created in the ground by digging, driving, boring or drilling. The subsurface water is usually drawn by pumping or raising containers, such as buckets." so it seems it would apply to the above wells as well. Note that it says "to access", which would IMHO include accessing water for monitoring it, rather than extracting it. Do you agree? It also says: "from an aquifer", which seems to include deep aquifers, but then mentions "subsurface" which is a term I would usually understand as close to the surface (or am I misguided)? https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dwater_well > > "The same applies on geothermal wells with substance=steam or > substance=water + utility=heating > > https://www.slb.com/drilling/rigs-and-equipment/wellhead-systems/geothermal-wellhead-system > " > > I agree, and I would not use man_made=water_well for a geothermal > energy facility. +1, I agree, because the intention is not to get water but to get heat. Cheers Martin
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