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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- PRECIPITATION-FREQUENCY
CURVE USING ALL DATA
AVAILABLE THRuUGH 19B6

95 PERCENT CONFIDENCE L,IMIT

'1985 ANNUAL MAXIMUM PRECIPITATION
VALUE AND YEAR--Year only
shown for largest storms; only
selected data points shown for
recurrence intervals less t!'ian
5 years to increase readability

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5,000 10,000

1.0 I 1.1 1.5 2 3 4 5 10 15 30 50 100 200 500 1,000
AVERAGE RECURRENCE INTERVAL, IN YEARS

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PRECIPIT A TION-FR EQUENC Y
CURVE,

Using all data avail,able
through I 9B6
Using only data ,,,!Hable
through 1984

AREA INCLUDED 8ETWEEN 95
PERCENT CONFIDENCE LIMITS:

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Using all data available
through 1986
Using -only data availabl~
through 1984

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10 15 30 50 100 200 500 1,000

5,000 10.000

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AVERAGE RECURRENCE INTERVAL, IN YEARS

Figure 2 c .--Precipitation-frequency curves for 15-minute
duration, arithmetic Gumbel distribution.

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