8274

• UCREFRP Catalog Number: 8274
• Author: Pitlick, J. and R. Cress.
• Title: Longitudinal Trends in Channel Characteristics of the Colorado River and Implications for Food-Web Dynamics.
• USFW Year: 2000.
• USFW - Doc Type: Recovery Implementation Program Project 48-C,
• Copyright Material: NO

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Observed Sediment Load (tons/day)
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Observed Sediment Load (tons/day)
Figure 11. Comparison between observed and predicted suspended sediment loads for pre- and
post-peak phases of the annual hydrograph, Colorado River near Cisco, Utah.
Daily suspended sediment loads were calculated for each gauging station using the appropriate
equation from Table 2 and the recorded daily discharge. The calculations were repeated for each
day of the water year for each year in the period 1934 through 1997. The individual daily values
were then summed to give the annual suspended sediment load (see appendix Table A-1).
Table 2. Coefficients and exponents used in the rating curve equation (2) to fit sediment load-
discharge data from various USGS gauging stations on the Colorado River.
Location k Q. a Eqn. No.
----------------------------------
Glenwood Springs ------------------
0.04 --------------------
4 --------------------
2.2 -----------------.
3a
Cameo
pre-peak 3.0 25 1.6 3b
post-peak 0.07 20 2.0 3c
State Line
pre-peak 3.0 40 1.6 3d
post-peak 0.1 -30 1.9 3e
Cisco
pre-peak, 1934-66 40 45 1.2 3f
pre-peak, 1967-97 12 85 1.4 3g
post-peak, all years 5 35 1.4 3h
late season, all years
---------------------------------- 30
------------------ 40
-------------------- 1.8
-------------------- 3i
------------------
15