FLOOD06686

• Designation Number: 10
• County: Pueblo
• Community: Pueblo
• Stream Name: Saint Charles River
• Basin: Arkansas
• Title: FIR - St. Charles River
• Date: 3/1/1970
• Designation Date: 6/1/1970
• Prepared For: Pueblo
• Prepared By: USACE
• Floodplain - Doc Type: Floodplain Report/Masterplan

.

ch~racte~istics of stre~s in the general region were compared,
adjusted when necessary, and used for the analysis. Due to the
lack of recorded stage-discharge data and difficulty In correl_
ating elevations, past floods cannot be compared with the Inter_
mediate Regional flood On the study reach.
The maximum known floods that have ocourred ~ithin
the geographical region are listed in Table 6.

.

Determination of Standard Prolect FlOOd
Only in fare instances has a specifio streee experI_
enced the largest flood that is potentially possible. Severe as
the maximum known flood may have been On any given etream, it is
generally accepted_that 8 larger flood ~ill eooner or later OCcur.
The Corps of [ngin~~rs, in cooperation with tho Woather Bureau,
has made comprehensive studies and investigations basad on the
vest records of e~perienced stor~s and floods snd hes evolved
generalized procedures for estimating the flood potential of
streams. These procedures were used in determining the Standard
Projoct Flood, which is defined e~ the flood that Can be expected
from the most Severe combination of meteorological and hydrow
logicalcornlitionsthatisconeideredreasonablycharacteristic
of the geographical area in which the drainage bosin is located,
e~cluding extremoly rare combinations.
SLam.iard Project Flood rainfell estimates were basad
on regionalized stcrm patterns developed by the U.S. Weather Bu_
reeu. Averaged over the drainage area, the estimated rainfalls

were calculated

as 9.9 inches
24 hours.

in 3 hours, 15.2 inches in 6 hours,
Peek discharges of the Standard

,

end 17.1 inches in
Project Flood.vary

frOm 15,000 cubic feet per seccnd near the

.

upper limit of the study reach to 126,800 cubic feet per second
at the confluence with the Creenhorn River. The discharges re-
duce progressively a9 flows pBSS downstre~ below the Greenhorn
River confluence, reaching 90,300 cubic feet per second at the

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