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<br />provided a copy of their Flood Hazard Analysi s, "Coal Creek and
<br />Rock Creek, Boulder, and Weld Counties, Colorado," dated October
<br />1976. The SCS also provided hydraulic backwater computer model
<br />input data for Coal Creek near Erie. The USGS provided copies of
<br />Flood Prone Area Maps for the study area. The COE indicated that
<br />they had no pertinent technical information that could be included
<br />in the Coal Creek study.
<br />
<br />The CWCB provided a copy of the Technical Addendum, "Floodplain
<br />Information, Flood Control and Floodplain Management Plan for Coal
<br />Creek at Erie, Colorado," prepared by Water Resource Consul tants,
<br />Inc. (WRC) , dated August 1980. The addendum contained copies of
<br />the HEC-2 computer modeling for a portion of the study area.
<br />
<br />Robinson Engineering, Inc. (REI), was contacted in response to a
<br />recommendation from the Town of Erie. REI provided detailed
<br />topographic mapping for a portion of this study area.
<br />
<br />1.3 Authority and Acknowledgments
<br />
<br />The source of authority for this Flood Insurance Study is the
<br />National Flood Insurance Act of 1968, as amended.
<br />
<br />The initial hydrologic and hydraulic analyses for the major sources
<br />of flooding were performed by Gingery Associates, Inc., for FEMA,
<br />under Contract No. H~4017. This work, which was completed in
<br />December 1977, covered all significant flooding sources affecting
<br />Weld County and the Town of Eaton at that time. The hydrologic and
<br />hydraulic analyses for the Big Thompson River were performed by the
<br />COE, Omaha Di strict, in the Flood Plain Information Report dated
<br />February 1978.
<br />
<br />The hydrologic and hydraulic analyses for Coal Creek, south of the
<br />Union Pacific Railroad, were performed by the U.S. Department of
<br />the Interior, 8ureau of Reclamation for FEMA, under Contract
<br />No. EHW-87-E-2551. This study was completed in August 1988.
<br />
<br />2.0 AREA STUDIED
<br />
<br />2.1 Scope of Study
<br />
<br />This Flood Insurance Study covers the unincorporated areas of Weld
<br />County and the incorporated areas of the Town of Eaton, Weld
<br />County, Colorado. The area of study is shown on the Vicinity Map
<br />(Figure 1).
<br />
<br />The incorporated Cities of Evans, Fort Lupton, Greeley, Gilcrest,
<br />and the incorporated Towns of Au1t, Dacono, Erie, Firestone,
<br />Frederick, Garden City, Grover, Hudson, Johnstown, Keeneburg,
<br />Keata, Kersey, La Salle, Mead, Milliken, Munn, Pierce, P1attevil1e,
<br />Raymer, Roseda1e, Severance, and Windsor were not included in the
<br />study. The Pawnee National Grasslands was not studied.
<br />
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