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

0.6 4.0
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w 0.5
:r 3.0
u
~ 0.4
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w
Z 0.3 2.0 1:
U
0 ~
;:: 0.2 ~
'" 1.5
I- 15
0:: 0.1
<3 ;::
w '"
g; 0 1.0 I-
::; 0.9 0::
::> -0.1 0.8 <3
::; PR ECIPIT A TION -FREQUENCY w
0.7 0:
X a.
'" -0.2 CURVE USING ALL DATA 0.6 ::;
::; AVAILA8LE THROUGH 1986 ::>
...J -0.3 0.5 ::;
'" X
::> .~.. 95 PERCENT CONFIDENCE LIMIT
z '"
z -0.4 ,,' '1985 ANNUAL MAXIMUM PRECIPITATION 0.4 ::;
'" .. ...J
~ VALUE AND YEAR--Year only '"
-0.5 ::>
shown for largest storms; only 0.3 z
::; z
:r selected data points shown for '"
I- -0.6
Ii: recurrence intervals less than
'"
8 -0.7 5 years to increase readability 0.2
...J
-0.8
1.01 1.1 1.5 2 3 45 10 15 30 50 100 200 500 1,000 5.000 I 0.000
AVERAGE RECURRENCE INTERVAL, IN YEARS
0.6 4.0
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w 0.5
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<.>
~ 0.4
~ "'
w
g 2.0 1:
0.3 u
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'" 0.2 ~
I- 1.5 Z
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<3 0.1 0
w ;::
0: PRECIPIT A TION-FREOUENCY 1.0 '"
a. 0 I-
::; CURVE, 0.9 0::
::> -0.1 0.8 <3
::; Using all data available w
X 0.7 0:
through 1986 a.
'" -0.2
::E Using only data available 0.6 ::;
::>
...J through 1984 0.5 ::;
'" -0.3 x
::>
z AREA INCLUDED 8ETWEEN 95 '"
z 0.4 ::E
'" -0.4 PERCENT CONFIDENCE LIMITS, ...J
l5 '"
-0.5 ~ Using all data available ::>
::E 0.3 z
z
:r through 1986 '"
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~ .-..- Using only data available
illlJ
8 -0.7 through 1984 0.2
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-0.8 5.000 I 0,000
1.01 1.1 1.5 2 3 45 10 15 30 50 100 200 500 1,000
AVERAGE RECURRENCE INTERVAL, IN YEARS
Figure 3d. --Precipitation-frequency curves for 30-minute duration,
logarithmic Gumbel distribution.

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