[GRASS-user] Trying to create a water depth map

[Thomas Adams]

All;

I'm trying to create a water depth map using the following:

(1) DEM
(2) vector polygon indicating the lateral extent of inundation
(3) stream channel centerline

I figure I can intersect the polygon with the DEM raster to get the water
surface elevations along the boundary of the extent of flooding. Assuming
that perpendicular to the stream channel centerline, the water surface
should be level, I don't know how to interpolate water surface elevations
across the channel. But, if I can do this, I could, using r.mapcalc, do a
simple subtraction between the water surface elevation raster and the DEM
raster, resulting with a flow depth raster.

The water surface elevation should, of course, decrease in value in the
downstream direction.

It does not seem that r.lake will do this, or will it?

Any thoughts?

Thank you,
Tom

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