[Tagging] Drain vs ditch

[Eugene Podshivalov]

The primary concern of mine about the current definitios of drain and ditch
is that some people are differentiating them by size.
Since there is no consent on "drain" tag deprecation, I suggest to at least
correct the current definitions to prevent the misuse.

We can either make a clear distinction between the two as suggested in
Varian #1 in
https://lists.openstreetmap.org/pipermail/tagging/2019-February/042762.html

or stay close to dictionary definitions which assumes some overlapping
between the meanings. Here is an example:
drain - a narrow artificial open-air channel that takes away waste liquids
or rainwater
ditch - a narrow channel dug at the side of a road or field to hold, bring
or carry away water

Cheers,
Eugene

ср, 20 февр. 2019 г. в 12:50, Eugene Podshivalov <yaugenka at gmail.com>:

> ср, 20 февр. 2019 г. в 02:30, Warin <61sundowner at gmail.com>:
>
>> On 19/02/19 20:40, Eugene Podshivalov wrote:
>>
>> Canals and ditches are artificial channels carrying naturual water
>>
>> this suggests there is 'unnatural' water...
>>
> What does "unnatural" water mean to you? To me, "natural" means emerging
> from springs and flowing by it's own along an open-air channel. Examples of
> "unnatural" is a swimming pool which you fill in with a hose or stome water
> drainage channels or when water is served by a pumping station.
> Both navigable canal and a canal of a straightened river carry water
> through an aritificial (digged out) channel.
>
> Here is an example of such river.
> http://www.picshare.ru/view/9902044/
> On the left is the natural waterway of a river in the year of 1937. On the
> right is the same river nowadays. Note that the current geometry is drawn
> detailed enough, it is the waterway itself which is very straght now.
>
> Cheers,
> Eugene
>
> ср, 20 февр. 2019 г. в 02:41, Warin <61sundowner at gmail.com>:
>
>> On 19/02/19 21:21, Tony Shield wrote:
>>
>> I'm not in favour of combining ditch and drain. My mind sees a ditch as a
>> dug-out stream which may flow into a stream or flow into a drain, the drain
>> being a much larger flow. I see drains as  having water flow several metres
>> wide but a ditch as less than a metre of surface flow.
>>
>>
>> Those differences can be mapped using the key width.
>>
>> Other than the width .. what other differences do you see?
>>
>> To me;
>>
>> a drain is a ditch that only provides for water removal. Some of these
>> are small - less that 1 meter wide. The direction of water flow will tell
>> you if it is a supply or a removal (drain) system.
>>
>> a ditch could provide water supply or removal and possibly in some cases
>> either depending on water levels?
>>
>> TonyS
>> On 11/02/2019 16:18, Hufkratzer wrote:
>>
>> On 10.02.2019 14:57, Eugene Podshivalov wrote:
>>
>> [...}
>> *Variant #2*
>> Combine "ditch" and "drain" tags into one.
>> [...}
>> Personally I lean toward variant 2 [...}
>>
>>
>> This would require to deprecate "drain" and remove it from the presets,
>> otherwise we will continue to have 2 tags in the long run.  As far as I
>> know deprecating a tag is only possible if it's usage declines. Currently
>> its usage increases steadily. How do you intend to change that? What is the
>> incentive for the mapper to use "ditch" instead of "drain" from now on? I
>> am not even sure that most mappers will notice the change on the wiki pages.
>>
>>
>> _______________________________________________
>> Tagging mailing listTagging at openstreetmap.orghttps://lists.openstreetmap.org/listinfo/tagging
>>
>>
>>
>> _______________________________________________
>> Tagging mailing listTagging at openstreetmap.orghttps://lists.openstreetmap.org/listinfo/tagging
>>
>>
>> _______________________________________________
>> Tagging mailing list
>> Tagging at openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/tagging
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tagging/attachments/20190222/14d90bb7/attachment.html>