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FLOOD10502 (2)
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FLOOD10502 (2)
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Last modified
1/26/2010 10:13:31 AM
Creation date
11/1/2007 11:35:04 AM
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Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
State of Colorado - 2007 Flood Documentation Reports
Date
8/1/2007
Prepared For
CWCB
Prepared By
ICON Engineering
Floodplain - Doc Type
Floodplain Report/Masterplan
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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 />creek. For several hours, water was trapped on the western side of the embankment <br />which led to ponding of up to 5 to 6 feet deep. Water levels started to receed once a <br />second cut in the embankment was excavated, This event caused flood damage to <br />approximately 12 residential structures and 3 commercial businesses. <br /> <br />The exact failure mode ofthe earthen-embankment is not known however, flood flows <br />did not overtop the embankment. It is suspected that flows in Fountain Creek eroded the <br />creek -side toe of the embankment to the point where a portion of the creek escaped the <br />main channel and went through and around the embankment. The history and purpose of <br />this embankment is currently open for debate but, apparently, the embankment has been <br />in place for a long time (reportedly dating back 80 years). The embankment has been <br />referred to as an uncertified levee or as an abandoned railroad grade. No ballast was <br />observed as might be expected for an abandoned railroad grade. The embankment is not <br />shown as a levee on the effective FIRM (dated September 29, 1986). According to the <br />relatives of long-time area residents, the embankment may have been built by CCC <br />forces back in the 1920's. Based on the remains of the embankment observed the day <br />after the failure, ICON believes that the embankment was likely about 20 to 25 feet wide <br />at the crest, with approximately 3: 1 side-slopes, and approximately 10 feet in height <br />(although due to the erosion from the creek at the break-through point, the original <br />ground level for the embankment was not determined). Apparently, the original <br />embankment did not have riprap-protection on the slope facing the creek. Aerial photos <br />provided by the City of Pueblo, which were taken in 2004, indicate that the low-flow <br />channel of Fountain Creek in this area was approximately 200 feet east of the toe of the <br />embankment at the time the photo was taken. This creek is a very active alluvial system <br />with a number of meanders and a history of the thalweg changing location. <br /> <br />The gap in the embankment at the point of failure was approximately 150 feet long. A <br />second breach in the embankment was excavated to relieve trapped flows at a point <br />approximately 2,500 feet downstream of the initial failure point. Water escaping through <br />the upper embankment failure created a pond of approximately 50 acres in size which <br />inundated a residential area west of Dillon Drive currently owned by Mr. Bill Dickey. <br />Until the second breach was excavated, ponding depths continued to rise. Flows <br />exceeded the low-point on Dillon Drive, approximately 500 feet south of the Highway <br />50/47 interchange, which sent water to the west inundating a mixed-use development <br />(known locally as the Trollsville neighborhood). Eight homes and two businesses <br />required evacuation. <br /> <br />With the assistance of crews and equipment from local contractors, Pueblo County, <br />CDOT, and volunteers, the City eventually closed the gap in the embankment. The initial <br />break in the embankment was reported at about 8:00 AM on Monday May 7th and the <br />gap was closed by about 2:30 PM onthe following day. City personnel estimates that the <br />total cost for the temporary embankment repair was in the range of $35,000 to $75,000. <br />Damage estimates for the local residents and businesses were not readily available. <br /> <br />ICON Engineering, Inc <br /> <br />2 <br /> <br />May .2007 <br />
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