On Mon, 19 Sep 2016, Mark Seibel wrote:

Flow accumulation can be modeled with r.watershed or r.terraflow, with the
former as a preference for drainage networks.


Mark,

  I wondered is these were appropriate for such a small area. I'll use them
and see what results I get.

r.stream.extract will vectorize the drainage network.

  I doubt there's much of a drainage network, mostly laminar surface flows.

Thanks,

Rich
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