7824

• UCREFRP Catalog Number: 7824
• Author: Miller, W. H., et al.
• Title: Colorado River Fishery Project, Part III, Final Report, Contracted Studies.
• USFW Year: 1982.
• USFW - Doc Type: \
• Copyright Material: NO

to canyon topographies; 3) lack of certain headwater and tributary
temperature data and 4) lack of certain temperatures against which model
output might be validated.
The description, development, calibration and validation aspects
of the temperature model are presented in this report. A temperature
screening for suitable Colorado squawfish spawning is also presented.
Continued refinement of the model would be facilitated by careful review
of and comment upon the material-in this report.
Flow-Habitat Linkages
Because BR intended to conduct PHABSIM analysis of its future
project operations, and because a BR model known as the Colorado River
Simulation System (CRSS) had been used in the past to simulate basin-wide
flow effects of these project operations, a linkage system between CRSS
output and the PHABSIM system was developed. The intent was to provide a
more comprehensive evaluation of project analyses by utilizing the water
budgeting model to provide flow regimes expected at key points in the
basin as a result of single or multiple BR water depletions.
The output of the CRSS model was in the form of monthly flow
sequences for time periods from 10 to as many as 70 years at single or
multiple points in the basin. The computer linkages between CRSS (or
other sources of flow time-series) and PHABSIM were developed as com-
ponents of a program library; structure and use of this library is
described in Appendix II.
MATERIALS AND METHODS
PHABSIM Site Selection
From the meeting on March 17 and 18, 1980, in Grand Junction,
Colorado, it was determined that the rationale for initial consideration
of segments (called "strata" by CRFP personnel) would be Colorado squaw-
fish nursery areas. Based upon this criterion, Segments, A, C, and F from
the CRFP study were suggested on the Green River and the strata enclosed
by river miles 0-48, and 71-86 were suggested for the Colorado River. In
addition, the Black Rocks and Westwater Canyon areas were suggested,
based on the captures of humpback chubs at those areas. Further, it was
suggested that the upper- and lower-most five miles of each segment
be considered "transitional" and removed from consideration as
potential sampling sites.
Because of logistic problems involved
in Westwater Canyon, no commitment was made
summer 1980.
• Of the remaining five segments, each was
of its entire stratum (after elimination of
areas noted as being entirely anomalous, such
in measurement of a reach
to study that area during
considered representative
transitions) except those
as Black Rocks or certain
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