[OSM-newbies] Small streams under minor tarmac roads

[exnpo-openstreetmap at yahoo.co.uk]

Greetings,

What is the standard way of mapping small streams under rural minor unclassified roads?

If I'm standing on a bridge, however tiny, it's a bridge!
 
However, in my area there's loads of streams criss-crossing the countryside and I'm not at all sure how to map a stream, which often dries up in midsummer, which goes into a smallish diameter - 600mm - concrete pipe which then passes under a tarmac road, about 3 metres in width, and reappears the other side where the stream continues it's way on the surface?

I've considered pipeline and tunnel but don't think their use applies here?

Any advice please?

Regards, Pete
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