Total length of riffle units is a useful factor in evaluating
fish habitat, particularly for steelhead. To obtain the
total length of riffle units for each 6th field from
USFS
Region 6 tabular data, we summed the lengths of all
units defined as type "R" (riffle). For the
ODFW
GIS data and the
Lincoln
District data, we summed the lengths of all units
classified as type "RI" (riffle) and "RP" (riffle with
pockets).
The ODFW total length was calculated in the
habitat-level
GIS layer, and reach totals were then joined to the
reach-level GIS layer. We calculated total length
of units classed as "riffle" and "riffle with pockets"
per reach in the
Lincoln District
database. Total riffle length per reach from all three
sources was then summarized by 6th field and joined to
the aquatic habitat summary table (
Lrif_all
in
aqhab_sum_final.zip).
Please address questions or comments
to:
Dr. Ralph Garono
Principal Investigator
Earth Design Consultants, Inc.
rgarono@earthdesign.com
Laura Brophy
Principal Investigator
Green Point Consulting
brophyl@peak.org |
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