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Last modified
1/25/2010 7:11:36 PM
Creation date
10/5/2006 2:56:52 AM
Metadata
Fields
Template:
Floodplain Documents
County
Statewide
Community
State of Colorado
Basin
Statewide
Title
Drainage Basin Descriptions
Date
6/28/1972
Prepared For
State of Colorado
Prepared By
UDFCD
Floodplain - Doc Type
Data (general)
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<br />effective until January 1, 1972, that area was included in the mapping <br />effort. of Project REUSE. <br /> <br />Definition of Terms <br /> <br />. <br /> <br />The following definitions are used in the mapping procedures and <br />narrative descriptions: <br /> <br />A - Area of basin in square miles. Tributaries or direct flow <br />areas having drainage basins smaller than 1000 acres (1.56 sq. mi.) <br />are not separately defined in t.he study. Major drainage basins are <br />divided into subbasins along natural divides within the major basin <br />or at existing physical features such as highways, railroads and <br />irrigation ditches, which can affect the runoff from the major storm. <br /> <br />L - Lengt.h of study basin in miles along the main stream, gulch <br />or primary drainageway stem. <br /> <br />LCA - Distance in miles from downstream limit of study basin <br />along the stream or drainage channel to a point perpendicularly <br />opposite the centroid of area. <br /> <br />S - Slope of thalweg from upstream limit to downstream limit <br />of basin. <br /> <br />Heavy Line on Quadrangle ( ) - Tributary basin boundary. <br />This boundary line forms the tributary, subtributary or major direct <br />flow basin boundary for the major storm. This boundary is normally <br />determined by existing land features. However, in some cases physical <br />features, such as roads or irrigat.ion ditches, which appeared to form <br />a barrier to the runoff from the major storm, are used. <br /> <br />. <br /> <br />Lightweight Line on Quadrangle ( j - Subbasin boundary. <br />This boundary line subdivides the major tributary or direct flow area <br />into 1000 to 3000 acre subbasins for analysis. The subbasin division <br />is normally selected at some physical feature within the tribut.ary <br />basin to logically divide the basin into smaller units. In the event <br />this line coincides with a road or other map feature, making it. difficult. <br />to follow the boundary line, a double line ( ), one on each side <br />of the physical feature, is used to indicat.e the boundary. <br /> <br />1-30-3600-01 - Code number defining subbasin. <br /> <br />(1-30-3600-01) <br />SH-3 - Reference to code number when basin parameters are <br />defined on another quadrangle. The "SH-3" indicates that the parameters <br />are listed on Quadrangle Sheet 3. <br /> <br />CT - A coefficient used in the Colorado Urban Hydrograph Procedure <br />(CUHP) runoff analysis reflecting the time to peak of t.he unit hydrograph. <br />(See Urban Storm Drainage Criteria Manual.) <br /> <br />CP - A coefficient used in the CUHP relating to the peak rate of <br />runoff. (See Urban Storm Drainage Criteria Manual.) <br /> <br />. <br /> <br />8 <br />
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