FLOOD03713

• Designation Number: 173
• County: Boulder
• Community: Longmont
• Stream Name: Dry Creek No. 1
• Basin: South Platte
• Title: Floodplain Information, Flood Control and Drainage Plan - Dry Creek Number 1
• Date: 4/1/1980
• Designation Date: 2/1/1981
• Floodplain - Doc Type: Floodplain Report/Masterplan

1eferenceLine
Stati.onl71+50

from a single storm at Longmont waS 4.04 inches On May 9. 1957. On the
average a storm exceeding 0.5 inches occurs only six times per year.

Looki.ng downstream at
Airport Road crossing.

probabilities of receiving
Table-3 liscs these rela-
These values (Table-3) are noC

The ~ational Weather Service has developed
a given depch of rainfall in a given cime.
tionships for the Dry Creek ~o. I basin.

Schlagel subdivision is
visible in the background.

adjusted for aerial distribution because of the size of the drainage area.

TABLE-3
RAINFALL DEPTH FOR VARIOUS STORM DURATIONS
AND FREQUENCIES
(inches)

Reference Line
Station 208+00 FREQUENCY STORM DURATION
, HOUR 6 HOURS 24 HOURS
Looking downstream at
private road crosdng. S-YEAR L4 2.0 2.'
IO-YEAR L' 2.5 '-'
50_YEAR 2,4 '-' 4.4 I
lOO-YEAR 2,' ),' 5,0
SOO-YEAR ),4 '" ',2

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'- "J~;'; -":':...'
w .~~_ ~
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1'.. '_.,
~,,,;,;.,
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:1<'
,

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, t.,
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r'.1Ji'
, ~-R
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Note:

The I-hour storOlis considered theDlOst probable f1oodproducer in
this area and thus I-hour values were ysrd in this study.

-

,

Clover Basin Tributary
Referenc..Line
Station 28+00

The temperatures in the area are relatively mild and typical of the
eastern plains of Colorado. Mean monthly temperatures range from 270 F
in January to 120 F in July. Th. minlOlum temperature falls below 320 F
an average of 175 days per year and the maximum temperature exceeds 900 F
an average of 36 days per year.

Looking dO'JOstrea~ from
ISth srn'ct.

Crass pa"tur~ in th~ overbanks
is typical of upstre"",reiicb,,".

20