[GRASSLIST:1600] Creating flow areas

[Artemis]

Hi all,

My problem is to calculate the watershed basin
average height. With the basins, I got with 
r.watershed I applied several formulaes and
got the realistic results.

But how to get the area of flow for a particular
point? (I need to calculate the avheight for 
the raster polygon that represents area, from
which water flows to the point, that I give).
Is there such a module in GRASS?

Thanks in advance, 

Artemis.