FLOOD04308

• County: Otero
• Community: Otero County
• Stream Name: Arkansas River
• Basin: Arkansas
• Title: Floodplain Information Report
• Date: 8/1/1981
• Prepared For: Otero County
• Prepared By: MSM Consultants, Inc.
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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lO~year and 50-year Flood Events
Information regarding these lower frequency ftoods is especially
useful for future engineering studies and land use planning
purposes related to minor l.'oad systems, minor channel
improvements, the location of parks and recreational facilities,
agricultural lands, and appurtenant structures. For structures
and uses of thts eype on the smaller tributaries or in areas
where the high risk of structural failure is economically
feasible, and the hazard to life and propet"cy nonexistent, the
use of the lower frequency floods may be considered.
IOO-Year Flood Event.

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The 100Myear flood event may also be used for engineering design
purposes where a lower risk of failure than the 10M or 50Myear
flood is desired. However, the most important use of the
100.year flood event lies in floodplain designation and land use
regulation as set forth in the state statutes. The State of
Colorado considers the 100-year frequency flood as the flood
event to be used in designing and protecting structures and
dwellings for human occupation. Therefore, all floodplain
",!ulations are based upon the lOa-year flood. Also, the area
wh ch would be inundated by the laO-year flood may be delineated
as an area of state interest as set forth in H.B. 1041 -- the
state's land use bill.

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SOO-Year Flood Event -

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The 500-year flood event is useful in making the public aware
that floods larger than the 100-year flood csn and do occur.
Just because a person is living above the 100-year flood boundary
does not lUesn that he is completely safe from flooding. The
SOO-year flood event can also be used for regulating high risk
developments within the floodplain such as nuclear power plants.
or the storage or raanufacture of toxic or explosive materials.

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Table 3 lists the discharge and water Bur face elevations for the
10M SOM 100M, and SOO-year flood events at selected reference
points.
Flooded Areaa

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The 100Myear frequency flood has been selected by the State of
Colorado as the flood event to be used for floodplain delineAtion
and regulation. Thus the Flooded Area plates show only the
boundary of the lOO-year floodplain. The flooding limits were
plotted st the cross section locations using the Hf.C-2 computer
results, and then interpolated between cross sections by field
investigation with the help of aerial photography and
topographical maps of the area.

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