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<br />C. 240,000 D. 240,000
<br /> 220000 - PUBLISHED PEAK DISCHARGE 220,000
<br />0 ' OF THE 1921 FLOOD 0
<br />z 200,000 - z
<br />0 0 200,000
<br />U U
<br />w 180,000 w
<br />OJ OJ 180,000
<br />a: REVERSAL IN a:
<br />w 160,000 CURVATURE w 160,000
<br />D- D-
<br />e- OF DATA I;;
<br />w 140,000 140,000
<br />w w
<br />u. u.
<br />u 120,000 w u 120,000
<br />in I in
<br />:J e- :J
<br />U 100,000 u.O u 100,000
<br /><:: 00 <::
<br /> wO
<br />ui 80,000 (')~ W 80,000
<br />(') <(u. (')
<br />a: 60,000 e-~ 0: 60,000
<br /><( OJSj <(
<br />I ,,~ I
<br />U 40,000 <( u 40,000
<br />OJ w OJ
<br />0 D- O
<br /> 20,000 20,000
<br /> 0 0
<br /> 10 15 20 25 30 35 40 5
<br /> STAGE AT CABLE GAGE, IN FEET
<br />
<br />EXPLANATION
<br />
<br />o 1924-62 DATA
<br />
<br />- LINEAR AND POWER-LAW REGRESSIONS FIT TO THE
<br />1924-62 DATA ABOVE A STAGE OF 26 FEET
<br />
<br />
<br />PUBLISHED PEAK DISCHARGE
<br />OF THE 1921 FLOOD
<br />
<br />MILD REVERSAL IN
<br />CURVATURE
<br />OF DATA
<br />
<br />W
<br />I
<br />e-
<br />u.0
<br />00
<br />wg
<br />(')u.
<br />i"~
<br />OJSj
<br />,,~
<br /><(
<br />W
<br />D-
<br />
<br />10 15 20 25 30 35 40
<br />STAGE AT NUMBER 1 GAGE, IN FEET
<br />
<br />EXPLANATION
<br />
<br />o 1921-25 DATA
<br />
<br />- LINEAR AND POWER-LAW REGRESSIONS FIT TO THE
<br />1921-25 DATA ABOVE A STAGE OF 20 FEET
<br />
<br />Figure 12-Coutinued. Linear and power-law oxtrapolations of the stage-dischargo rating curves at the Lees Forry, Number 4, Cable, and Number 1
<br />Gages, [e) Rating curve at the Cable Gage defined by the 3,196 discharge measurements made during water years 1924-62 that included stage
<br />observations at the Cable Gage, S1age is relative to the revised Cable Gage datum of October 12, 1924 (see Appendix B), Shown for comparison are the peak
<br />stage and published peak discharge of the 1921 flood, [01 Rating curve at 1he Number 1 Gage defined by the 136 discharge measurements made during
<br />water years 1921-22 that included stage observations at the Number 1 Gage and by the 81 discharge measurements during water years 1924-25 on days
<br />with stage nbserva1ions at the Number 1 Gage, Stage is relative to tho Number 1 Gage datum of September 26, 1921 (see Appondix BI, Shown for
<br />companson are the peak stage and publIShed peak discharge of the 1921110od,
<br />
<br />This result suggests that extrapolation of either the data suggest thatthc uppcr end of the stage-discharge rating-
<br />from 1921-62 or only thc data from 1921-22 should curve at the Number 4 Gage can be approximated cithcr
<br />provide a reasonably good estimate of the peak discharge as a line or as a power-law [unction, Linear extrapolation
<br />of the 1921 flood. The similar goodncss-of-fit values Illl' ofthc data suggest that the peak disehargc of the
<br />the linear and power-law regressions suggest that the .1921 flood was about 156,000 ft3/s, and power-law
<br />. .
<br />upper end of the stage-discharge rating-curve at the Lees 10' extrapolatiou of the data suggest that the peak discharge
<br />Ferry Gage can be approximated either as a liue or as a of the 1921 flood was about 147,000 ft3/s (fig, 12B).
<br />power-law function. Linear extrapolations of both the The reversal in curvature of the 1924--62 stage-
<br />1921-62 and 1921-22 data suggest that the peak discharge data at the Cable Gage occurs at a stage of
<br />discharge of the 1921 flood was ahout 182,000 ft3/s, and 26ft on this gage. Linear and power-law regressions
<br />power-law extrapolations of both the 1921-62 and 1921- lit to the data above this stage both have R2 values of
<br />22 data suggest that the peak discharge of the 192] flood 0.971. The identical goodness-of-fit valnes for the linear
<br />was about 168,000 ft3/s. and power-law regressions suggest that the upper end of
<br />The reversal in curvature ofthe 1921-23 stage- the stage-discharge rating-curve at the Cable Gage can he
<br />discharge data at the Number 4 Gage occurs at a stage of approximated either as a line or as a power-law function,
<br />16 n on this gage, The linear regression lit to the data Linear extrapolation of the data suggest that the peak
<br />above this stage has an R2 valne 01'0,971; the power-law discharge of the 1921 1100d was ahout 145,000 fL3/s, and
<br />regression fit to the data above this stage has au R2 value power-law extrapolation of the data suggest that the peak
<br />of 0,975, As at the Lees Ferry Gage, the similar goodness- discharge ofthe ]921 flood was about 143,000 It3/s
<br />of-lit valnes for the linear aud power-law regressions (fig, 12C).
<br />
<br />!
<br />
<br />,
<br />...
<br />
<br />". '."
<br />
<br />28 Computation and Analysis of the Instantaneous~Discharge Record for the Colorado River at Lees Ferry, Arizona-May 8. 1921. through September 30, 2000
<br />
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