>>    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).

Momentum and viscosity - but yeah, I see what you're saying.

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