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<br />City of Fort Collins Hazard Mitigation 404 Grant Application:
<br />Early Warning System
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<br />Project Location:
<br />Project Budget:
<br />Year Completed:
<br />Client:
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<br />Fort Collins, Colorado
<br />$37,571
<br />1998
<br />City of Fort Collins, Colorado
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<br />On July 28, 1997 a severe flash flood occurred in Fort Collins, Colorado as a result of a
<br />monsoonal moisture pattern that migrated from the south and was trapped against the foothills along the
<br />western portion of the city. Fourteen and a half inches of rain fell in a 3 I-hour period with over 6 inches
<br />occurring in 2 hours. The resulting flood
<br />has been determined to be larger than a
<br />500-year event. The flood claimed five
<br />lives, damaged or destroyed 2,000
<br />homes and businesses, swept four
<br />railroad cars off the tracks, and
<br />triggered a gas explosion.
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<br />Several solutions were
<br />evaluated and an early warning system
<br />was recommended. The recommended system consists of the hardware and software to assess potential
<br />flooding within each stormwater basin; a comprehensive flood warning notitication system; training and
<br />public awareness programs; disaster drills and responder training; and long-term maintenance of the
<br />system. Cost estimates were developed and system cost effectiveness was evaluated, including estimates
<br />of loss-of-life and property damages.
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<br />Anderson Consulting Engineers,
<br />Inc. (ACE) was contracted by the City
<br />of Fort Collins to prepare a Hazard
<br />Mitigation 404 Grant Application to
<br />document the need for an early warning
<br />system for the City. To prepare this
<br />document, ACE collected data from a
<br />variety of sources including
<br />meteorological data, streamflow data,
<br />hydraulic information, mapping of
<br />flooded areas, and estimated damages.
<br />The document presented descriptions of
<br />flooding problems. previous mitigation
<br />efforts, inventories of flood hazards, and
<br />evaluation of problem causes including
<br />descriptions of meteorology, storm
<br />sewer and street conveyance capacities,
<br />drainage channel conveyance, irrigation
<br />ditch spills, and blockages of culverts
<br />and bridges.
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<br />ANdERSON CoN5UITiN<j EN<jiNEERS, INC.
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