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I I I I I I I I I I I I I I I I I I I 100-year floodplain and the 500-year floodplain. Since the base map for the Flooded Area plates is a 2' contour map, the out 1 i nes of the other flood events can be readily plotted using the information in Table 7. The area delineated on the Flooded Area plates as the 100-year floodplain meets the requirements of H.B. 1041 as an area of state interest. Also, upon official approval of this report by the Colorado Water Conservation Board, the area outlined by the 100-year flood boundary will be designated a floodplain area and may be regulated accordingly by the local officials. Survey control markers exist in the field in the vicinity of Lefthand Creek and its associated floodplain area. A summary of these control markers and their locations is given in Table 8. Flood Insurance The National Flood Insurance Program 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 1 ives and new construct ion from future Flood Elevations flooding. Flood insurance through the National Flood Insurance Program is available to all residents of Boulder County and the City of Longmont under the regular phase of the program. Boulder entered the regular program February 1, 1979 and the City of Longmont entered on July 5, 1977. A Flood Insurance summary is shown in Table 9. Additional information on the Flood Insurance Program is available Flood crest elevations for the 10-, 50-, 100-, and 500-year floods may be found in three separate locations in this report. The Flood Frequency-Elevation and Oischarge Oat a table (Table 7) lists these elevations at selected reference points. The Flooded Area Plates 3 through 16 give the plan view of the flooded area on a contour base map and the high water elevations for the lOO-year flood can be interpolated from this. The Flood Profile Plates 17 through 19 show the streambed elevation and the high water elevations for all four frequency floods. from local insurance agents or brokers and the : The flood profiles may be used in areas where controversy arises over Federal Emergency Management Agency Division of Insurance and Mitigation Denver Federal Center, Building 710 Lakewood, Colorado 80225 Telephone: 234-6582 the 100-year flood boundary on the Flooded Area plates. Since the flood profile plates give the elevations and distance or stationing from a known point, the high water elevations can be surveyed on the ground to alleviate any discrepancies on the base map. 9