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

'" 0.9 8.0
w 7.0
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U 0.8 .1985
~ 6.0
~ 0.7 '"
5.0 w
~ J:
U
;:: 0.6 4.0 ;;
'" ;;
>-- 0.5
0:: 3.0 ~
<3
w 0.4 ;::
0: '"
0- >--
::! 0.3 2.0 0::
=> PRECIP IT A TION- FREQUENCY <3
::! CURVE USING ALL DATA w
X 0.2 0:
0-
'" AVAILABLE THROUGH 1986 ::!
::! 0.1 .. =>
.J . 95 PERCENT CONFIDENCE LIMIT ::;
'" . ..' x
=>
z 0 . . 1985 ANNUAL MAXIMUM PRECIPITATION 1.0 '"
z 0.9 ::;
'" VALUE AND YEAR--Year only Q.8 .J
~ -0.1 shown for largest storms; only '"
0.7 =>
::! selected data points shown for z
-0.2 0.6 z
:I: recurrence jntervals less than '"
>--
12 -0.3 5 years to increas.e readability 0.5
'"
8 -0.4
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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
'" 0.9 8.0
w 7.0
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u 0.8
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5.0 w
Z J:
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0 0.6 4.0 ~
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>-- 0.5 Z
0:: 3,0
<3 0
w 0.4 PRECIPIT A TION-FREQUENCY ;::
0: '"
0- CURVE: >--
::! 0.3 Using all data available 2.0 0::
=> <3
::! through 1986 w
x 0.2 0:
'" Using only 'data available 0-
::! through 1964 ::!
.J 0.1 =>
'" ::!
=> AREA INCLUDED BETWEEN 95 1;0 x
z 0 PERCENT CONFIDENCE LIMITS: '"
z -0.9 ::!
'"
~ -0.1 ~ Using all data available 0.8 .J
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'0.7 =>
! through 1966 z
-0.2 z
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>-- .:.:.:.:.:.:.:.
~ :.:.:.:.;.:.:.:
............... through 1984 0.5
-0.3 ...............
-......
8
.J -0.4
1.01 1.1 1.5 2 3 45 10 15 3.Q 50 IQO 200 500 1.000 5.000 I 0.000
AVERAGE RECURRENCE INTERVAL. IN YEARS
Figure 3 g.--Precipitation-frequency curves for 24-hour duration,
logarithmic Gumbel distribution.

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