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<br />I <br />I <br />I <br />!I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />,I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />CITY OF CANON CITY, COLORADO <br />HAZARD MITIGATION GRANT APPLICATION <br /> <br />I. PROBLEM DESCRIPTION <br /> <br />Flooding problems within the North Ninth Street drainage basin are caused by inadequate <br />capacity of the street storm drain system (curb and gutter) to carry surface flow as well as <br />inadequate capacity of the existing underground stormwater sewer system to carry runoff to the <br />river. Flat topography and manmade flow obstructions that block the natural drainage (i.e. <br />railroad embankment, highway embankment, etc.) also exacerbate the problem. Floods in <br />Fremont County normally occur during the spring and summer months from May through <br />September as a result of intense thunderstorms or large general rainstorms. <br /> <br />The North Ninth Street drainage basin has a drainage area of approximately two (2) square miles. <br />The basin headwaters originate along Skyline Drive on the western edge of the city. Skyline <br />Drive runs from north to south along a shale "hogback" ridge that is the upturned edge of a once <br />extensive prehistoric ocean that existed throughout many parts of Colorado. The nature of the <br />shale and overlying sparse vegetation reduce infiltration of runoff produced by intense summer <br />thunderstorms. Lying just east of, and running parallel to, the Skyline Drive hogback is a smaller <br />hogback ridge which contains seven (7) openings that funnel runoff into the North Ninth Street <br />neighborhood during storm events. Depending upon storm intensity, streets, yards, and first <br />floors can be impacted by runoff. <br /> <br />I-I <br />