[OSM-talk] river - stream

Dave F davefoxfac63 at btinternet.com
Sat Jun 6 16:00:13 UTC 2020


Do you have an example?

Whether it's a bridge or tunnel is fairly easily defined by determining 
which is taking the load.
If a tunnel's structure was removed, would whitewater's above it 
collapse? If 'yes' then it's a tunnel.

DaveF


On 06/06/2020 16:48, Martin Koppenhoefer wrote:
>
> sent from a phone
>
>> On 5. Jun 2020, at 15:44, Dave F via talk <talk at openstreetmap.org> wrote:
>>
>> There can't be both a tunnel and bridge. It's one or the other. This goes for all scenarios, including roads.
>
> you can have both, but it is rare...
> and it depends on your definitions of course  (e.g. you might call it an enclosed bridge or sth. like this). In engineering standards, tunnels are not only dug structures but also completely enclosed linear ways with certain length (e.g. in Germany it’s from 80m onwards according to concrete standards, IIRR), which can also in exceptional cases lead over a bridge.
>
> Cheers Martin
>
>




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