FLOOD00374

• Designation Number: 146
• County: Chaffee
• Community: Unincorporated Chaffee County
• Stream Name: Lower South Arkansas River
• Title: Floodplain Information Report - Lower South Arkansas River
• Date: 4/1/1979
• Designation Date: 12/1/1979
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Flood Stage

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Left Bank

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Log-Pearson Type III
Distribution

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Low Hazard Zones

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Meander

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Obstruction

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Peak Discharge

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Precipitation

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Probability

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Reach

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Recurrence Interval

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The stage or elevation at which overflow of the
natural banks of a stream or body of water begins
in the reach or area in which the elevation is
measured,

The bank on the left side of a river, stream, or
water course as the observer looks downstream.

A statistical distribution used in flood frequency
analysis, which is described by three parameters:
(1) the mean; (2) the standard deviation; (3.) the
coefficient of skewness of the logarithms; of the
sample observations.

That area of the floodplain in which the waters of
a 1% chance flood will not attain a maximum depth
greater than one and one-half feet.

The winding of a stream channel.

Any natural or manmade object existing in, along,
across, or projecting into any channel, water course,
or regulatory flood hazard area which may impede,
retard, or change the depth or the direction of flow
of water either by itself or by catching or collecting
debris carried by such water, or that is placed where
the flow of the water might carry the same downstream
to the damage of life or property.

The largest value of streamflow attained by a flood,
usually reported in units of cubic feet per second (cfs).

Is the
of the
face.
sleet,

discharge of water, in liquid or solid state, out
atmosphere, generally upon a land or water sur-
Precipitation includes rainfall, snow, hail, and
and is therefore a more general term than rainfall.

The annual chance of occurrence of specific hydrologic
events, such as rainfall over a specified area or peak
discharge at a specified location. It is expressed in
percent, e.g., 5% representing one chance in 20 of the
event occurring in any year or an average recurrence
of once in twenty years.

A segment of the river defined between two specified
points.

The average interval of time, in years, within which a
given flood will be exceeded once.

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Reference Point

A numbered point identifying a specific location for
correlating the data shown in various forms through-
out the report.

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Retention

The prevention of runoff from entering the storm or
combined sewer system by storing it on a surface area
or in a storage basin

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Right Bank

The bank on the right side of a river, stream, or
water course, looking downstream.

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Runoff

The quantity of rainfall which flows over the surface
to enter the stream as discharge volume. The differ-
ence in quantity between rainfall and runoff represents
losses to infiltration and interception.

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Skewness

A numerical measure or index of asymmetry of a frequency
distribution, From a practical standpoint, the term
indicates the position or negative curvature of a
flood-frequency relation.

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Stream

Any natural channel or depression through which water
flows either continuously, intermittently or periodi-
cally, including any artificial modification of the
natural channel or depression.

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Watershed

The drainage area situated above a specified point on
a stream including the area drained by tributary streams
which enter the main stream above this point.

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