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I I I I I I I I I I I I I I I I I I I INTERPRETATION AND USE OF REPORT Flood Frequency and Discharge Discharges listed in "Hydrologic Analysis" in this report are given for the 10-, 50-, 100-, and 500-year frequencies. This discharge information can be used for planning and engineering of floodplain improvements as well as for floodplain regulations upon official designation by the Colorado Water Conservation Board, The 100-year flood can be expected to occur at any time in a given area. Based upon recorded historical precipitation, land runoff characteristics and other data, ther is a one percent chance that the 100-year flood will be equalled or exceeded in anyone year, The 100-year flood is consi dered by CWCB and the Federa 1 Insurance Administration as the flood magnitude for which floodplains should be designated for regulatory and improvement purposes, In Colorado, the 100-year floodplain is an area of state interest as defined in House Bill 1041 - Section 24-60-101 of the Colorado Revised Statutes, Flood events rarer than the 100-year flood event can and will occur. Plans for land improvement adjacent to the 100-year floodplain should consider the probability of flood damage, Flood Elevations Plates 6 through 13 show the 10-year and 100-year flood profiles for Crystal and Dirty Woman Creeks, Plates 14 and 15 show a graphical display of some of the cross-sections and the computed 100-year flood elevations at these cross-sections, Tables 1 and 2 give a summary of pertinent data at each cross-sect ion, The actua 1 HEC-2 computer output is in the fi 1 es of the Co lorado Water Conservat ion Board. I n case of any quest i on regard i ng 100-year flood elevations, the flood profiles should be consulted, Flood Insurance The National Flood Insurance Program (NFIP) is a Federal program that enables property owners to buy flood insurance at a reasonable, subsidized cost, In return, communities are required to carry out floodplain management measures to protect lives and new construction from future flooding, Exhibit 3 gJves some NFIP rate information, Additional information on the NFIP is available as follows: COMMUNITY INFORMATION: AGENT AND BROKER INFORMATION: Federal Emergency Management Agency Natural & Technological Hazards Division Bldg. 710, Denver Federal Center Box 25267 Denver, CO, 80225-0267 (tel, no. 235-4830) Mr. Jim Quinn Computer Sciences Corp, 2801 Youngfie1d, suite 320 Golden, CO, 80401 (tel, no, 231-9911) 7