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<br />High Hazard Zones
<br />
<br />That area of the floodplain flooded by the 100-year flood which will have a depth of
<br />at least 1.5 feet or a flow velocity of at least 3.0 feet per second.
<br />
<br />Intermediate Regional Flood.
<br />
<br />A type of flood, including water surface elevation and territorial occupation thereof,
<br />which can be expected to occur at any time in a given area based upon recorded
<br />historical precipitation and other valid data, but with an average statistical one
<br />percent chance of being equalled or exceeded during anyone year. The term is used
<br />interchangeably with a one percent flood or one hundred year flood. (See definition
<br />for 100-year flOOd.)
<br />
<br />Low Hazard Zones.
<br />
<br />That area of the floodplain in which the waters of a 100-year flow will not attain a
<br />maximum depth greater than one and one-half feet or a velocity not greater than
<br />three feet per second.
<br />
<br />Probabili ty.
<br />
<br />The annual chance of occurrence of specific hydrologic events, such as rainfall over
<br />a specified area or peak discharge at a specified location expressed in percent, e.g.,
<br />5% representing one chance in 20 of the event occurring in any year or an average
<br />recurrence of once in twenty years.
<br />
<br />Reference Point.
<br />
<br />A numbered point identifying a specific location for correlating the data shown in
<br />various forms throughout the report.
<br />
<br />Runoff.
<br />
<br />The quantity of rainfall which flows over the surface to enter the stream as
<br />discharge volume. The difference in quantity between rainfall and runoff represents
<br />losses to infiltration and interception.
<br />
<br />Sheet Flow.
<br />
<br />Broad, shallow overland flood flows varying from a few inches to two feet in depth.
<br />Stream.
<br />
<br />Any natural channel or depression through which water flows either continuously,
<br />intermittently or periodically, including any artificial modification of the natural
<br />channel or depression.
<br />
<br />Watershed.
<br />
<br />The drainage area situated above a specified point on a stream including the area
<br />drained by tributary streams which enter the main stream above this point.
<br />
<br />-18-
<br />
<br />BIBLIOGRAPHY
<br />
<br />1. U.S. Dept. of the Interior, Geological Survey, "Water Resources Data for Colorado,
<br />Park 1, Surface Water Records," 1913 through 1974.
<br />
<br />2. U.S. Dept. of the Interior, Geological Survey, WSP 1313, "Surface Water Records,"
<br />1901 through 1913.
<br />
<br />3, U.S. Dept. of the Interior, Bureau of Reclamation, "Design of Small Dams,"
<br />Washington, D.C., 1974.
<br />
<br />4. U.S, Dept. of Agriculture, Soil Conservation Service, "Procedures for Determining
<br />Peak Flows in Colorado," Soil Conservation Service, March 1977.
<br />
<br />5. U.S. Dept. of Commerce, Nat. Oceanic and Atmospheric Administration,
<br />"Precipitation-Frequency Atlas of the Western United States," Vol. III-Colorado,
<br />Nat. Weather Service, Silver Spg., Md., 1973.
<br />
<br />6. U.S, Army Corps of Engineers, "HEC-2 Water Surface Profiles, Computer Program
<br />723-X6-L202A," The Hydrologic Engineering Center, Davis, Ca., October 1973,
<br />
<br />7. U.S. Dept. of Commerce, Bureau of Public Roads, "Hydraulic Charts for the
<br />Selection of Highway Culverts," Hydraulic Engineering Circular No.5, Washington,
<br />D.C., April 1964, and "Capacity Charts for the Hydraulic Design of Highway
<br />Culverts," Hydraulic Engineering Circular No. 10.
<br />
<br />8. Chow, Ven Te, Ph.D., "Open Channel Hydraulics," McGraw-Hill, New York, 1959.
<br />
<br />9. USDA Soil Conservation Service, "Resource Data: Sulfur Creek Channel Through
<br />Town of Meeker," 1969.
<br />
<br />10. Department of the Army, Corps of Engineers, Sacramento District, "Rangely,
<br />Colorado, Flood Insurance Hydrology," February, 1976.
<br />
<br />11. , Model Floodplain Information Report, Colorado Water Conservation
<br />Board, 1976.
<br />
<br />12. , Guidelines for Determining Flood Flow Frequency, Bulletin No. 17,
<br />U.S. Water Resources Council, Washington, D.C., March 1976.
<br />
<br />13. Colorado Water Conservation Board; "Technical Manual No.1, Manual for
<br />Estimating Flood Characteristics of Natural Flow Streams in Colorado," 1976.
<br />
<br />14. U. S. Department of the Interior, Geological Survey, WSP 1683, "Magnitude and
<br />Frequency of Floods in the United States, Part 9, Colorado River Basin," U.S.G.P.O;
<br />Washington, 1966.
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