[Tagging] Waterway directionality in drainage canals

Volker Schmidt voschix at gmail.com
Sat Apr 28 11:01:15 BST 2012

Interesting question.
I do have do navigable canals that can have the water flow in either
direction, under operator control. I think there must be many of them.
I so far have not bothered about the flow direction, as boat traffic goes
both ways independently of the actual flow of the water, but you have a
point here.

Padova, Italy

On 28 April 2012 11:24, Nathan Edgars II <neroute2 at gmail.com> 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?
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