FLOOD10363 ‎(2)‎

• County: Gunnison
• Community: Gunnison County
• Stream Name: East River, Cement Creek, Alkali Creek, Ohio Creek
• Title: Gunnison County Flood Hydrology, Contract # W99-D-0018 Final Report
• Date: 11/1/2004
• Prepared For: US Army Corps of Engineers, CWCB and Gunnison County
• Prepared By: Tetra Tech, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Figure 5.9.2.1 Peak to Daily Flow Relationship- Taylor River at Almont

4,500

1,000

/ "'"
y; 1.1164x .
R2; 0.948
/ ./
./ .('.
. y
. ~
/ ;f"
./ /.
V

4,000

3,500

Ul
~
Gl
g' 3,000
"
C
o
E
< 2,500
'Iii
o
~ 2,000
'Iii
..
~
~ 1.500
...
to
Gl
l1.

500

o
o

500

1,000 1,500 2,000 2,500 3,000
Corresponding Daily Flows at Taylor at Almont (cis)

3,500

4,000

5.9.3 Results for Taylor River at Almont

Before any analysis was completed, the data record for both the East River at A1mont and Taylor River at
Almont were filtered for rain on snow events, using the 0.5 inch criteria discussed in Section 4.1.1. One
rain on snow event was found in the record of the Taylor River at Almont gage. The East River at A1mont
results are described in Section 5.4.

The REGFREO and HEC-FFA programs were used to perform the analysis on the flow record in
Appendix A - Table A9. Prior to using the REGFREO program, HEC-FFA was used on both the East
River at Almont and Taylor River at A1mont data to test for low and high outliers based on a methodology
described in Bulletin 17B. Any outliers were manually removed from the REGFREQ data set. The 1977
flow for the East River gage was determined to be a low outlier. The results from the analysis are
presented in Figure 5.9.3.1. Additionally, the adopted statistics and the 10, 2, 1, and 0.2 percent chance
exceedence flows are presented in Table 5.9.3.1.

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