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FLOOD07920
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Last modified
1/25/2010 7:13:09 PM
Creation date
10/5/2006 3:18:14 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
259
County
Huerfano
Community
Walsenburg
Basin
Arkansas
Title
Flood Insurance Study - Walsenburg
Date
9/1/1986
Designation Date
9/1/1986
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />i' <br /> <br />I. <br /> <br />i " <br />~ t ( <br /> <br />Transportation routes in the area include U.S. Interstate 25, U.S. <br />Highway 160, Colorado State Highways 10 and 69, numerous county <br />roads and city streets, and the Colorado & Southern Railroad (Refer- <br />ence 1). <br /> <br />2.3 <br /> <br />Principal Flood Problems <br /> <br />~oJ. <br /> <br />Storms in the study area are usually thunderstorms or cloudbursts <br />that are of short duration and cover only a small area. Moisture- <br />laden winds coming in contact with the mountain slopes, or con- <br />vectional air currents OVer the plains, are forced upward, causing <br />rapid condensation and torrential precipitation. Storms of a general <br />character are infrequent, and there are few instances of storms of <br />several days duration. <br /> <br />t- <br /> <br />Natural and nonnatural drainage obstructions within the watershed <br />impede~~off, creating backwater and increased flood heights. <br />Debris washing downstream during floods often collects against <br />bridges or in restricted flow areas, reducing waterway openings <br />and impeding the floodflow. This creates a damming effect and, <br />depending on the degree of clogging, caUSeS greater backwater depths <br />and increased overbank flooding. Also, a pronounced increase in <br />flow velocities usually occurs downstream from an obstruction, <br />thus extending the flood damage potential. Nonnatural obstructions <br />on or over the drainage, such as dams, levees, bridges, and culverts, <br />can also create more extensive flooding than would otherwise occur. <br /> <br />Nonnatural obstructions on the Cucharas River include two city <br />bridges, a Colorado & Southern Railroad bridge, and the U.S. <br />Interstate 25 bridge. Figures 2 and 3 show typical bridges in the <br />vicinity of Walsenburg. <br /> <br />Newspaper files and historical records were searched for flood <br />information on Walsenburg. Nothing was found, however, to indicate <br />that any serious flooding had occurred in the past. Local citizens <br />repor~~t--flooding did occur on August 6, 1936, when a railroad <br />bridge collapsed and, along with, trees and other debris, plugged <br />the river channel, causing substantial damage to Walsenburg and <br />the immediate vicinity. <br /> <br />Potential flood heights for future flooding events in the City of <br />Walsenburg are shown in Figures 4 through 6. <br /> <br />2.4 Flood Protection Measures <br /> <br /> <br />The North Walsenburg Flood Control Project was designed and constructed <br />under the supervision of the U.S. Soil Conservation Service. The <br />flood-control dam and diversion facilities were constructed to <br />prevent flood damage to North Walsenburg. The dam controls runoff <br />for a 0.62-square-mile area and is located directly northwest of <br />Walsenburg. <br /> <br />5 <br />
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