[Tagging] Waterway directionality in drainage canals

Alan Mintz Alan_Mintz+OSM at Earthlink.Net
Sun Apr 29 04:42:20 BST 2012


At 2012-04-28 02:24, Nathan Edgars II wrote:
>It's the standard to draw a waterway in the direction of flow. I've 
>questioned this several times, but it's an ingrained default.
>
>My question is more specific: what happens to a drainage canal that 
>reverses direction? I offer the Everglades and surrounding agricultural 
>land as an example. There are huge "water conservation areas" that store 
>water. When it rains, gates are closed and opened to direct water into 
>these. During a drought, gates send water back out into the canals for 
>local use. When there's a big storm, water will instead go directly out to sea.
>
>So there are a lot of major canals that have no fixed direction. How 
>should these be mapped? Is there any existing scheme that can show how 
>water flows under different conditions?

oneway=no would make sense, since the (unusual) default assumption for this 
type of object appears to be oneway=yes.

--
Alan Mintz <Alan_Mintz+OSM at Earthlink.net>




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