[Tagging] Flood mark or high water mark

[Robert Szczepanek]

Right Phil, thanks for this remark.
Tides are rather short-term and more predictable water table variations. 
As such, seldom marked with physical signs. In Poland we found 0 within 
262.

High water mark (boundary) is probably more legal term - demarcation of 
water/land mainly in coastal zones. It can be found in US, GB, AU and 
probably many other countries [1][2].

Big problem is very wide (misleading) meaning of "high water mark" [3].

regards,
Robert

[1] 
http://www.valuergeneral.nsw.gov.au/__data/assets/pdf_file/0008/216980/Valuation_of_land_below_high_water_mark_commercial_waterfront_occupancies_July_2017.pdf
[2] http://cromersurveyors.com.au/blog/high-water-mark-title
[3] http://www.mikelynaugh.com/MalvernHill/images/IMG_2341.jpg

W dniu 25.07.2018 o 14:21, Philip Barnes pisze:
> High water is commonly used in terms of tides.
> 
> Phil (trigpoint)
> 
> On 25 July 2018 13:05:56 BST, Robert Szczepanek <robert at szczepanek.pl> 
> wrote:
> 
>     Hi all,
> 
>     We work on flood marks project [13] and your opinion on proper tagging
>     is crucial for us, as database of existing features is based on OSM
>     records. We have identified probably most of existing marks in Poland,
>     but would like to finally unify tagging within OSM project.
> 
>     Both terms (flood mark and high water mark) can be treated as synonyms
>     [1][2].
>     High water mark is more popular in USA [3][4], while flood mark in
>     Europe [5][6]. But this is not a rule [7].
> 
>     Why "flood mark" term is better in our opinion?
>     1. "Flood" term is shorter and easier to understand worldwide compared
>     to "high water".
>     2. Flood mark is more popular in scientific publications [8, 9, 10].
>     References are from "Hydrology and Earth System Sciences", one of the
>     best hydrological journals [11].
>     3. "High-water mark" term is used also in economy and has another
>     meaning [12].
>     4. All additional keys usually contain "flood", not "high water" term.
>     Like "flood_date". It will be more consistent.
> 
>     In OSM database there are now:
>     - 262 features with flood_mark=yes [14]
>     - 80 features with historic=highwater_mark [16]
>     - 20 features with high_water_mark=yes [15]
> 
>     Question 1:
>     a/ flood_mark
>     b/ high_water_mark
>     c/ highwater_mark
> 
>     Question 2:
>     Which tagging convention should we follow:
>     a/ flood_mark=yes + historic=memorial + memorial:type=flood_mark
>     b/ historic=flood_mark + flood_mark:type=(plaque, painted, ...)
>     c/ historic=highwater_mark
> 
>     Not every flood mark is a memorial, so probably 2.a/ is not the optimal
>     option. Short discussion about this can be found here [17].
> 
>     Thank you for help,
>     Robert
> 
> 
>     References
>     [1]http://floodlist.com/dealing-with-floods/flood-high-water-marks
>     [2]
>     https://theconversation.com/historical-record-shows-these-floods-are-no-high-water-mark-23266
>     [3]https://www.weather.gov/gld/1935flood-hwmarks
>     [4]https://www.fema.gov/high-water-mark-initiative
>     [5]
>     https://www.ceh.ac.uk/news-and-media/news/ceh-experts-contribute-environment-agency-report-feh-local-flood-frequency-estimation
>     [6]
>     http://www.studia.photos/england/oxford-oxfordshire-england-uk/attachment/flood-marks-osney-lock-river-thames-oxford-oxfordshire-england-uk/
>     [7]
>     https://www.alamy.com/stock-photo-flood-level-hight-marks-on-st-margarets-church-porch-kings-lynn-norfolk-11448961.html
>     [8]https://www.hydrol-earth-syst-sci.net/19/3517/2015/hess-19-3517-2015.pdf
>     [9]
>     https://www.hydrol-earth-syst-sci-discuss.net/12/6541/2015/hessd-12-6541-2015.pdf
>     [10]
>     https://www.hydrol-earth-syst-sci.net/18/4029/2014/hess-18-4029-2014.pdf
>     [11]https://www.scimagojr.com/journalsearch.php?q=hydrology
>     [12]https://www.investopedia.com/terms/h/highwatermark.asp
>     [13]http://openhydrology.org/maps/flood_mark/
>     [14]https://wiki.openstreetmap.org/wiki/Key:flood_mark
>     [15]https://wiki.openstreetmap.org/wiki/Key:high_water_mark
>     [16]https://wiki.openstreetmap.org/wiki/Tag:historic%3Dhighwater_mark
>     [17]https://wiki.openstreetmap.org/wiki/Talk:Tag:historic%3Dhighwater_mark
> 
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