[GRASSLIST:7280] Hazard Assessment

[Dave Kent]

I am looking at a project which involves a hazard assessment of several 
hundred kilometres of pipeline route.  I need to find where the 
pipeline crosses valleys and classify the steepness of the approach 
slopes to the stream.

I have vector coverage of the stream courses and raster DEM topographic 
data.

How can I extract the locations where the pipeline intersects the 
streams?

What options are available to classify the steepness of the slope on 
the pipeline route and perhaps display with a vector line with a width 
proportional to slope or colour proportional to the slope.

Thanks in advance for any help.

Dave