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<br />A comparison of the u.s. Army Corps of Engineers flood profiles to those <br />shown in the Flood Insurance Study reveal two areas where the IOO-year <br />flood elevations differ by more than 0.5 foot. The first area of discre- <br />pancy is at n.s. Highway 85. The reason for the discrepancy at this <br />location is due to the way Lathurn Ditch was analyzed. The policy of the <br />Federal Insurance Administration is not to consider irrigation ditches <br />in the hydraulic analysis. The U.S. Army Corps of Engineers analysis <br />considered the Lathurn Ditch as an additional flow area, which the Flood <br />Insurance Study analysis did not, resulting in a smaller effective flow <br />area and higher water-surface elevation being shown for the Flood Insurance <br />Study. The second area of discrepancy is approximately 1 mile upstream of <br />Evans. The reason for the discrepancy is additional cross sections were <br />used in this Flood Insurance study, resulting in more accurate elevations <br />of the flood heights. <br /> <br />This study is authoritative for the purposes of the Flood Insurance <br />Program; data presented herein either supersede or are compatible with <br />all previous determinations. <br /> <br />7.0 LOCATION OF DATA <br /> <br />Survey, hydrologic, hydraulic, and other pertinent data used in this <br />study can be obtained by contacting the office of the Federal Insurance <br />Administration, Regional Director, ~oom 311, 909 17th Street, Denver, <br />Colorado 80202. <br /> <br />8.0 BIBLIOGRAPHY AND REFERENCES <br /> <br />1. Alan ~~. Voorhees and Associates, Inc., Future Development Plan, <br />Evans, Colorado, June 1972 <br /> <br />2. Colorado ~1unicipal League, 1976 Directory of !'Iunicipal and County <br />Officials in Colorado, Wheat Ridge, Colorado, July 1976 <br /> <br />3. u.s. Department of Commerce, National Oceanic and Atmospheric <br />Administration, Data Service, Colorado Annual Suromary, Vol. 80, <br />No. 13, 1976 <br /> <br />4. u.s. Department of Agriculture, Soil Conservation Service, General <br />Soil ~1ap for Weld COUll ty, Colorado, r~ay 1972 <br /> <br />5. u.s. Department of the Army, Corps of Engineers, Special Plood <br />Hazard Information Report, South Platte River, volume I, Weld County, <br />Colorado, prepared for Weld County and Colorado Water Conservation <br />Board, Omaha, Nebraska, April 1977 <br /> <br />6. Weld County Planning Departrnent, Photos of 1969 Plood, f1ay 1969 <br />