FLOOD01823

• County: Garfield
• County: Mesa
• Community: Rifle, Parachute, DeBeque
• Stream Name: Colorado River
• Title: Floodplain Information Report Colorado River
• Date: 4/1/1996
• Prepared For: Garfield County / Mesa County
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

The foon of the equation is the same for the 50-year frequency and the IOO-year frequency; only
the coefficients vary.

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Colorado River mainstem
Downstream of Rifle

for 50-year frequency: k=74..3, c= 0.706
for IOO-year frequency: k"'71.28,c=O.772

3.3 Equation Selection Process

The CurveFit computer program analyzes thc input data using a library of 25 equations. The
output displays the constanls and the correlalion values for each equation. The best fit equations
are chosen based on the correJation value closest to 1.0. For this report an additional stepv..<lS
included in the selection of an equation. Of all the possible equations which fell within a
correlation value greater than 0.95, the lcast complex equation was chosen. The same equation
foonat wasselectcd for both the 50-year and loo-year Ilowcalculations.

3.4 HvdrolOlzicFindinl!s

Table 3 shows the results of this analysis in tabular foon. Figure 5 shows the relationship
between 50-year or loo-yearflow and drainage arca, as described by these equation s,ingraphical
form.

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