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<br />I <br /> <br />I <br /> <br />The assistance and cooperation of the agencies and organizations listed <br /> <br /> <br />below are appreciated and gratefully acknowledged: <br /> <br /> <br />City of Fort Collins, Colorado <br /> <br /> <br />U.S. Army Corps of Engineers, Omaha District <br /> <br />Colorado Water Conservation Board <br /> <br /> <br />Larimer County <br /> <br /> <br />Larimer County Data Processing Department <br /> <br /> <br />We would also like to acknowledge several of the irrigation ditch companies <br /> <br /> <br />owning and operating water systems in the study area, including: <br /> <br />North Louden Ditch <br /> <br /> <br />Pleasant Valley and Lake Canal Company <br /> <br />Trilby Lateral <br /> <br /> <br />North Poudre Irrigation Company <br /> <br /> <br />Thanks and appreciation are extended to these companies for their cooperation <br /> <br />and information. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Special thanks are extended to Mr. Stanley Blehm, who provided us with <br /> <br /> <br />information on the 1979 flooding in the Fossil Creek basin. <br /> <br />I <br /> <br />1.5 Mapping and Surveying <br />Topographic mapping for this study was furnished by the City of Fort <br />Collins .and Larimer County, Colorado. The plans in this report are at a scale <br />of I" = 200'. <br /> <br />I <br /> <br />I <br /> <br />Field surveys were completed by Simons, Li & Associates, Inc. to supple- <br /> <br /> <br />ment the topographic mapping as required. Spot elevations at each roadway and <br /> <br />railroad crossing were ~8ed to establish channe~ inverts and point elevations <br /> <br /> <br />of locations where elevations were critical to the hydraulic computations. In <br /> <br /> <br />general, field information was consistent with the topographic mapping. <br /> <br /> <br />The topographic maps supplied by the City were prepared by ARIX of <br /> <br /> <br />Greeley, Colorado in 1981 by photogrammetric methods. The original scale is <br /> <br /> <br />1" = 100' but the City provided mylars at 1" = 200'. The topographic mapping <br /> <br /> <br />provided by Larimer County is at I" = 200' prepared by M&I of Fort COllins, <br /> <br /> <br />Colorado in 1977 by photogrammetric methods. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />2 <br /> <br />1.6 Report Acquisition <br /> <br /> <br />Copies of this report may be examined at the offices listed below. A <br /> <br /> <br />"Technical Addendum" to this report is also available for review at the same <br /> <br /> <br />offices. The "Technical Addendum" includes all pertinent data and calcula- <br /> <br />tions used in this report. <br /> <br />Engineering Service Unit <br />City of Fort Collins <br />PO Box 580 <br />Fort Collins, CO 80522 <br /> <br />Larimer County Floodplain Administrator <br />Department of Public Works <br />PO Box 1190 <br />Fort Collins, CO 80522 <br /> <br />Colorado water Conservation Board <br />823 State Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203 <br /> <br />1.7 Related Studies <br /> <br />A comprehensive hydrologic and hydraulic analysis has been performed by <br /> <br />the U.S. Army Corps of Engineers (COE) , omaha District, for Larimer County. <br /> <br /> <br />This involved modeling the watershed using SWMM, determining water-surface <br /> <br />elevations using HEG-2 and plotting water surface profiles and flood plain <br /> <br /> <br />maps. The COE report is in draft form and will be published soon. The <br /> <br />current study is based on the basic data used in the COE study but basin boun- <br /> <br /> <br />daries, watershed parameters and hydraulic parameters were updated to reflect <br /> <br /> <br />current conditions and current land use policies_ A master drainageway plan <br /> <br /> <br />for Mail Creek, a tributary to Fossil Creek is also available (ref. 2). <br />