For heightfields, you could use the "hf_height_at"-function, for
flowline calculation, you could check the erosion function in HF-Lab:

http://www.best.com/~beale/

Your idea is definitely worth trying even though I'm not sure if it
leads to useful results with common patterns.  

Christoph

--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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