[GRASS-user] Flow accumulations units

[stephen sefick]

the S8, MFD(8), and Dinf are all ways to get flow accumulation.  What
are the units?  Grid accumulation?  So if I were to multiply a flow
accumulation by the squared resolution of the raster input map
(50x50=2500m).  I would get flow accumulation in squared meters and
then multiply by average areal runoff from USGS data in m/s for the
HUC areas that the project area resides.  This would give me cubic
meters per second.  I can then set some threshold in mapcalc say
.3cubic meters per second (arbitrary) to extract possible permanent
streams.  Does this make sense, or am I missing something.  Thanks for
all of your help,
kind regards,

-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis