St. wrote:
> 
>    I'm having a job to see where it's flowing uphill?
> 

When i say "it should always flow downhill" this does not necessarily 
mean it flows uphill in the image (although i am sure it does in some 
places).  It is simply not taking the downhill direction everywhere 
(i.e. the *steepest* direction going down).

Christoph

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