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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5.0

PRECIPIT A TION-FREQUENCy
CURVE USING ALL DATA
AVAILABLE THROUGH 1986

95 PERCENT CONFIDENCE LIMIT

.1985 ANNUAL MAXIMUM PRECIPITATION
VALUE AND YEAR--Year only
shown for largest storms; only
selected data points shown for
recurrence intervals less than
5 years to increase readability

'1896

4.0

3.0

2.0

1.0

. . .
. . ..
.

.1985

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

6.0

5.0

4.0

3.0

2.0

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1.0

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5,000 10,000

PRECIPIT A TION-FREQUENCY
CURVE:

Using all data available
througJt 1986
Using only data available
through 19B4
AREA INCLUDED BETWEEN 95
PERCENT CONFIOENCE LIMITS:

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Using all data a,vai/able
through 1986
Using oniy data available
through 1984

1.0 I I. I 1.5 2 3 4 5

10 15 30 50 100 200 500 1.000

5,000 10,000

AVERAGE RECURRENCE INTERVAL, IN YEARS

Figure 2 f.--Precipitation-frequency curves for 2-hour

duration, arithmetic Gumbel distribution.

20