FLOOD00005

• County: Statewide
• Title: Precipitation Records and Flood-Producing Storms in Cheyenne Wyoming
• Date: 10/23/2003
• Prepared For: Cheyenne
• Floodplain - Doc Type: Educational/Technical/Reference Information

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0.4 2.5
,(/) 0.3 2.0
w
:J:
() 0.2
;;; 1.5
;;; 0.1 (/)
w
Z :J:
0 .1985 ()
;:: 0 1973 1.0 ;;;
<( 0.9 ;;;
I- -0.1 1928 0.8
ii: ~
() 07
w -0.2 0.6 ;::
0: <(
0. I-
:::Ii -0.3 0.5 ii:
::> ()
:::Ii w
X -0.4 0.4 0:
PRECIPIT A TION-FREQUENCY 0.
<( :::Ii
:::Ii -0.5 .' CURVE USING ALL DATA ::>
-.l " 0.3 :::Ii
<( AVAILABLE THROUGH 1986 X
::>
z -0.6 . <(
z . . 95 ,PERCENT CONFIDENCE LIMIT :::Ii
<( 0.2 -.l
~ -0.7 . 1985 ANNUAL MAXIMUM PRECIPITATION "
::;)
:::Ii VALUE AND YEAR--Year only z
-0.8 z
:J: shown for largest storms; only "
l-
ii: -0.9 selected da ta pointa shown for
<(
" recurrence intervals less than
0 -1.0 0.1
-.l 5 years to increase readability
-1.1 0.08
1.01 1.1 1.5 2 3 45 1015 30 50 100 200 500 1,000 5.000 I 0.000
AVERAGE RECURRENCE INTERVAL. IN YEARS
0.4 2.5
(/) 0.3 2.0
w
:J:
() 0.2
;;; 1.5
;;; (/)
0.1 w
~ :J:
()
;:: 0 1.0 ;;;
<( 0.9 ;;;
I- -0.1 0.8 Z
e;
() 07 0
w -0.2. 0.6 ;::
0: <(
0. PRECIPIT A nON-FREQ UENCY I-
:::Ii -0.3 0.5 ii:
::> CURVE: ()
:::Ii w
x -0.4 Using all data available 0.4 0:
<( 0.
:::Ii through 1986 :::Ii
-.l -0.5 0.3 ::>
<( Using only data available :::Ii
::> through I 984 x
z -0.6 <(
z :::Ii
<( AREA INCLUDED 8ETWEEN 95
0.2 -.l
15 -0.7 PERCENT CONFIDENCE LIMITS: <(
::>
:::Ii ~ Using all data available z
:J: -0.8 z
I- through 1986 <(
ii:
<( -0.9 ............ Using only data available
8 ........,.......
::::::::::::;:::
.:.:".:.:.:-:.: through 1984 0.1
-.l -1.0 ;.;,;,.......
-1.1 0.08
1.01 1.1 1.5 2 3 45 1015 30 50 100 200 500 1,000 5.000 I 0.000
AVERAGE RECURRENCE INtERVAL, IN YEARS
Figure 3b. --Precipitation-frequency curves for 1 Q-minute duration.
logarithmic Gumbel distribution.
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