FLOOD10136

• Designation Number: 114
• County: Chaffee
• Community: Poncha Springs
• Stream Name: South Arkansas River/Poncha Creek
• Basin: Arkansas
• Title: FIR - South Arkansas River/Poncha Creek, Poncha Springs, CO
• Date: 3/1/1978
• Designation Date: 11/1/1978
• Prepared By: WRC, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Reference Point

A numbered point identifying a specific location for
correlating the data shown in various fo~s 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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BIBLIOGRAPHY

1. Department of the Army, Corp of Engineers, HEC-2 Computer Program
(Water Surface Profile Computer Program User Manual), Hydrologic
Engineering Center, Davis, California, November 1976.

2. Bulletin No.17, "Guidelines for Determining Flood Flow Frequency",
U.S. Water Resources Council, March 1976.

3. Water Supply Paper No. 1681, "Magnitude and Frequency of Floods in
the United States", U.S. Geological Survey, 1964.

4. Water Supply Paper No. 1849, "Roughness Characteristics of Natural
Channels", U.S. Geological Survey, 1967.

5. Technical Manual No.1, "Manual for Estimating Flood Characteristics
of Natural-Flow Streams in Colorado", Colorado Water Conservation
Board, 1976.

6. Section 4 - National Engineering Handbook, "Hydrology", U.S. Soil
Conservation Service, August 1972.

7. Water Supply Papers Containing Streamflow Records for the lower
Mississippi River Basin - Part 7, U.S. Geological Survey, (Up to 1960.)

8. "Water Resources Data for Colorado (1961-1975)". Published by the
U.S. Geological Survey in Cooperation with the State of Colorado.

9.

Map of Poncha Springs, Chaffee County, Colorado, January 1939.
Scale I" = 200'.

10.

Flood Hazard Boundary Map, Chaffee County, Colorado (Unincorporated
Area), U.S. Department of Housing and Urban Development, Federal
Insurance Administration, June 1977.

11.

Flood Hazard Boundary Map, Town of Poncha Springs, Chaffee County,
Colorado, U.S. Department of Housing and Urban Development, Federal
Insurance Administration, August 1975.

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