[GRASS-user] r.mapcalc: compare two maps [RESOLVED]

[Rich Shepard]

On Thu, 30 Mar 2017, Laurent C. wrote:

> In that case, you will not see the accumulation upstream the culvert that
> should normally occur if the pipe is actually higher than the ground.

Laurent,

   Both invert and outfall are above ground level and below the road. If
r.carve used the mean elevation between the two then the 'stream' is higher
than the bottom of the roadside swale. This should accumulate water until
the elevation matches the invert, correct?

> Please note that in a future version, Itzï will be able to model culverts
> more accurately thanks to a coupled drainage model. But this might be in a
> few months.

   I'd like to do the best that Itzi can with the current version. I may have
opportunities to do more flat land hydrologic models so the more fluent in
Itzi I am the easier it will be and the less I'll be asking for help. :-)

Rich