sf data.frame NHD Flowlines with comid, pathlength, lengthkm,
hydroseq, levelpathi, rpuid, vpuid, and arbolatesu
(dnhydroseq is required if tocomid is not provided).
vpu
character e.g. "01"
include_null_rpuid
logical default TRUE. Note that there are some
flowlines that may have a NULL rpuid but be included in the vector
processing unit.
run_make_standalone
logical default TRUE
should the run_make_standalone function be run on result?