FLOOD00934

• Designation Number: 69
• County: Gunnison
• Community: Gunnison
• Stream Name: Gunnison River,Tomichi Creek
• Title: Floodplain Information Report - Gunnison River/Tomichi Creek, Gunnison, CO
• Date: 12/1/1976
• Designation Date: 7/1/1977
• Floodplain - Doc Type: Floodplain Report/Masterplan

TABLE ~ (CONTINUED)

WTERPRETA1l0r: AND IJSE OF REPORT DATA

Cross
Section Streambed
Number Elevatioll
Tom1ch1 Creek
" 7593.8
" 7595.5
20 7597.0
U 7598.7
" 7600.9
" 7606.0
" 7690.0
" 7612.5
20 7618.9
" 7621.0
28 7626.0
" 7627.2
30 7627.2
31 7627.4
" 7629.0
n 7631.8
31 7633.6
" 7636.7
30 7638.7
n 7641.1
30 7642.5
" 7(,4(,.7
40 7649.3
" 7651.7
" 7653.5
" 7653.3
" 7655.7
" 7659.1
" 7660.R
" 7661.6

lO-Year
Flood
Ehvation

50-Year
Plood
Elevatien

lOO-Year
f'lood
Elevation

SOO-Year
Flood
Ehvation

Flood Frequency and Dischar~~

7601.6 7602.1 7602.3 7602.9
7602.5 7603.2 7603.5 7604.1
7603.3 7603.9 7604.1 7604.5
7605.5 7606.0 7606.2 7606.5
7607.4 7607.9 7608.0 7608.3
7613.6 7614.2 7614.3 7614.6
7616.6 7616.9 7617.0 7617.2
7617.7 7618.1 7618.2 7618.4
7622.7 7623.5 7623.8 7624.2
7628.3 7629.1 7629.3 7629.7
7631.7 7632.7 7633.0 7633.4
7632.5 7632.9 7633.2 7634.7
7635.6 7636.5 7637.0 7637.3
7637.0 7637.2 7637.3 7637.4
7637.0 7637.3 7637.4 7637.S
7637.9 7638.2 7638.3 7638.5
7638.7 7639.1 7639.2 7639.4
7640.0 7640.2 7640.3 7640.4
7644.1 7644.4 7644.S 7644.7
7641'>.0 7646.5 7646.6 7646.8
7648.1 7648.5 76411.6 7641\.7
7(,<;n.o 765n.5 76'iO.n 7h'in.7
7653.8 7654.1 7654.2 7654.4
7655.5 7655.9 7&56.0 7656.2
7657.8 7658.1 7658.3 7658.4
7659.7 7659.9 7660.0 7660.1
7660.8 7661.0 7661.1 7661.2
7663.2 7663.5 7663.6 7663.7
7664.6 7664.7 7664.8 7664.9
7665.8 7666.1 7666.2 1~66.1

The 10-, 50-, 100- and SOO-year flood events ~ere used as the
flood ftequcncies for this study. Thus making this report compatible
rorregulat1onpurpos"",andH.B.l041designationsandFederalInsurance
Administration flood insurance rate studiea.

These flood events have probability of occurrence one in the
numberefycarsasindicated. Forexallp1e,thelOO-yearfloodoccurs.
on the average, once in a lOa-year period, and has a one percent chance
of being equalled or exceeded in any given year.

Infermation ptesented for the 10- and 50-year floods could be
used by the local jurisdictions for planning purposes. They could be
used in future planning and design efforts related to various land use
activities, such as. design of roads and bridges. minot channel improve-
ments. planning parks and recreational facilitiea, and other types of
hydraulic structures.

Th~ lOO-year flood flow" may abo be \,-'ed for t_hose planntn~
and design activities mention~ in connection with 10- and 50-year flood

Ho..:s. T!!i~ is ;>antc,-,larly tr',e "'!!!,'-O' " l...,.nr ri~,. ~T T~il"r.. ~"'~r '~p

10- or SO-year flood it< desired. The most imPOTtant "se of the lOO-ye"T
flood flows is for th~ description of floodplain and its land use regu-
lation. The Color.!ldu:'itat" Statutes consld"r the lOO-year frequ"ncy
flood as rh~ flood event to be used in designin~ nnd protecting improve-
ments $lated fer hu~n occupation. Al~o, th~ aTeQ within the lOO-y~ar
flood may b~ delineated as ~n 3rea of state int~rest as ~et forth in
H.B. 1041 (State's land use bill). The lOO-year flood is almost accepted

nationally for the abeve mentioued purpo~e~.

Th~ 50ll-year flood cvent is u~ef1Jl in "",king the puhlic "...."rc
,hat flood~ gr""ter than th~ lOO-yenr fl<,<,rl d<, oce"r. and thc>se Iivlt\r
abov~ lh~ l.OO-y~a" flood "ater ""rface elev1\t1en aTe "ot necesA"rily
I'rot~ct~d fr"m flooding.

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