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I I I I I I I I I I I I I I I I I I . However, the most important use of the 1Oo-year flood event lies in flood plain designation and land use regulation as set forth in the state statutes. The state of Colorado considers the 1Oo-year frequency flood as the flood event to be used in designing and protecting stmctures and dwellings for human occupation. Therefore, all flood plain regulations are based upon the 100-year flood. Also, the area which would be inundated by the 1Oo-year flood may be delineated as an area of state interest as set forth in H.B. 1041, the State's land use bill. 500- Year Flood Event: The 500-year flood event is useful in making the public aware that floods larger than the 100-year flood can, and do, occur. Just because a person is li\'ing above the Ioo-year flood boundary does not mean that home is completely safe from flooding. The 5oo-year flood event can also be used for regulating high risk developments with the flood plain, such as nuclear power plants or the storage/manufacture of toxic or explosive materials. Flooded Areas As indicated, the 1Oo-year frequency flood has been selected by the state of Colorado as the flood event to be used for flood plain delineation and regulation. The flooded area plates show the boundary of the 1Oo-year flood plain. Since the base map for the flooded area plates is a t\\'O-foot contour map, the outlines of the other flood events - 10-,50-, and soo-year - can be plotted using the flood e\'ent ele\-ation contained in this report. The flood elevations have been estimated by using surveyed channel cross- sections and detailed topographic mapping. The hydraulic model (HEC-2) assumes that the hydraulic sections; such as the natural channel, channels formed by dikes or 18