[Tagging] Fire hydrants vs suction_point

[Moritz]

> In a water well, the initial water level corresponds to
> min_suction_head=# because it is the highest level that water can
> reach. Then water level will drop and suction head will increase.
> If you can't measure max_suction_head, simply leave the tag empty.
> 

You are right ;)

>> Maybe we should find a better suitable value for water_source=stream
>> which reflects also lakes.
>> What about
>> water_source=waterbody instead of stream?
> 
> So pond, stream, river, lake go in waterbody? For me it is ok.
> 

I would go for

stream, river, lake, ocean, sea -> water_source=waterbody

pond if it is a natural pond also -> water_source=waterbody

if it is an artificial created pond then it should be water_source=pond
and get the water_volume key.

With that scheme it is clear, that the amount of water is unlimited 
(waterbody) or limited (pond, together with the
volume key)

Moritz