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

I

I

Figure 5.3.3.1 Reach 4 Flood Frequency Analysis Results

I

7000

.

.

:

~T

:. ::

. .
I :: ::

; : :.
: .

:

,

6000

I

5000 -

~ ~ ;::
'/;,. "': ]:::::? tg~~
~ ~....... ~ 2: 7S--DDAAYy
;/, ~..,. :~ 1
'" ~ -7 ~ ' """
: + '" ~~ / lH' V 30-DAY
.. :: ,::: .. :/'.....Ja~~V.:. i-' ;
. . · ..". l' ,-, 'f(ft ~ V" y """"

.. :::::: ~'j.;. . a~~~~L1t~ ; · V
:: ;; ;;;;;.~ A~'~ <J..- ~;~ V:

.1< )~.;r4'rri t ~/ ,
.;. <J..d~~b[lJ ::::i-''''~
~: ;/'.........~'-'f.~V :.:: :y" :
...1-~:~~::r;....,I.:J.:;:: :;'L>:: ;
~~~2t~tT~;;'::: :
~/'l.V': U'1.~'::; ;
; ,J.? . ~ =:.i ,;.or: iiii :::
~. :;."; .j.:1....... i: .
- 4. '".
~ ~~;
-
v.

:... ."

I

4000

: ;

;

~ :

: ;
; :
;

. .

I

3000

;

I

2000
en
U
Q,-
E'
to
.s=
()
en
0
1000
900
800

.

;

I

I

I

I

700 - )~
;
: ;
600 - ::: ',',
. .
:
i : ': i .
500 : ;.;. ;
: :
; . . :
400
. :
;
;
300 I I It tt I I I I I
95 90 80 70 60 50 40 30 20 10 5 2
Exceedence Probability

.

:::

I

i

I

I

0.5 0.2

I'

Peak
1-Day
3-Day
5-Day
7-Day
15-Day
30-Day
60-Day

ADOPTED STATISTICS:

Mean Std. Dev. Skew
3.336 0.14 0.0
3.295 0.14 0.0
3.281 0.14 0.0
3.267 0.14 0.0
3.254 0.14 -0.1
3.205 0.14 -0.1
3.155 0.14 -0.1
3.069 0.15 -0.2

Notes:
1. Median Plotting Positions Based on
Extended Period of Record
2. Observed Period of Reoord: 1964-1972,
1980-1981,1994-2000.
3. Equivalent Years of Record ~ 64 yrs
by correlation with tributary.
4. Drainage area: 238 sq. mi.

GUNNISON COUNTY FLOOD HYDROLOGY
EAST RIVER ABOVE ALKALI CREEK

I

SNOWMELT FLOW FREQUENCY CURVE
REACH 4
U.S. ARMY CORPS OF ENGINEERS
SACRAMENTO DISTRICT

I

I

I

23