ditch vs. drain
How do I decide between the two? The picture and descriptions look very similar
As I see this page included in Category:Way Direction Dependent category, should I assume that the way must be draw so that the direction of the way is downstream?. If so is it better to add, as in page Tag:waterway=stream, the following sentence?
Direction of the way should be downstream.
waterway=ditch rendering change proposal on Mapnik
I have opened a request on the openstreetmap-carto Github to change the default rendering of waterway=ditch in the OSM default Mapnik render
Github request: https://github.com/gravitystorm/openstreetmap-carto/issues/1101
Currently, ways tagged with waterway=ditch are rendered from zoom level 13 onwards and they are rendered quite prominently at this zoom level. This can leave the render rather crowded in areas where ditches are used for land drainage
I propose that waterway=ditch is not rendered until zoom level 16+ and that it is rendered thinner also, similar to barrier=ditch
Crowding with waterway=ditch in Mapnik: http://www.openstreetmap.org/#map=13/54.7150/-8.7022
Clean rendering of barrier=ditch in Mapnik: http://www.openstreetmap.org/#map=16/54.6648/-8.7823
Example of good, clean rendering from Humanitarian render: http://www.openstreetmap.org/#map=15/54.7150/-8.7022&layers=H
- In my opinion neither implies the other one (there may be small ditch that is not a barrier, there may be a dry ditch that is a barrier but not a waterway) Mateusz Konieczny (talk) 08:31, 18 December 2014 (UTC)
- Both are distinctive. A waterway=ditch is for draining, a barrier=ditch for denying access. Neither implies the other. Perhaps barrier=ditch should be man_made=ditch/trench? --Jojo4u (talk) 20:40, 25 March 2015 (UTC)
For drainage and irrigation
In Asian countries, ditches are commonly used as minor irrigation channels from a larger canal or pond. How do we differentiate a ditch used for drainage from that used for irrigation? --Planemad/Talk 07:15, 13 April 2016 (UTC)