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COAL CREEK THROUGH THE CITY OF FLORENCE FREMONT COUNTY, COLORADO REPORT OF WORK ACCOMPLISHED TO DATE Reconnaissance The U.S. Army Corps of Engineers, Albuquerque District (Corps), has obtained the existing base map material and the HEC-2 hydraulic models used in the previous Flood Insurance Study. The existing cross-sectional data has been transferred to the new HEC-RAS model where appropriate. The reconnaissance and data search is 100.% complete. Land Survevs The Corps has consulted with G.R. Hall and Associates to survey a profile of the walls that parallel Coal Creek through the city of Florence. The Corps also worked with the surveyor to obtain spot elevations at bridge crossings. The survey is 100% complete. Hydrology The Corps has determined the 10.0%-,2.0%-, 1.0%-, and 0.2%-chance (10-, 50':', 100-, and 500- year) flood frequency discharge peaks to be included in the hydraulic model. The hydrologic analysis is 100% complete. Hydraulics The Corps is currently extracting cross sections and modeling bridges to include in the HEC-RAS hydraulic model. After the HEC-RAS model is complete, the Corps will compute the water surface elevations and plot the floodplain delineation maps. The hydraulic analysis is 30% complete. Profile Concurrence The profiles will be plotted upon completion ofthe hydraulic analysis. Profile concurrence is 0% complete. Base Map Material The Corps has obtained the existing topographic base maps. This task is 100% complete. Work Map Preparation The floodplain delineation work maps showing the 1.0%-chance and 0.2%-chance (lOO-year and 500-year) floodplains be prepared upon completion of the hydraulic analysis. This task is 0% complete. Report Preparation The Corps is writing the report as work proceeds to document progress. The report is 40% complete. Coordination Activities Coordinate activities are ongoing throughout the course of the study. Technical Review The review is ongoing throughout the technical analysis. A final technical review will be performed upon completion of the study and before submission to the Colorado Water Conservation Board and the Federal Emergency Management Agency, Region VIII.