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" 25 INTERPRETATION AND USE OF REPORT DATA SOD-Year Flood Event. The 500.y....r flood ..vent is Important in "",king the public aware that flood. larger than the 100-year flood can and do occur. The 500-year flood event Can also be u~ed for regulating development. within tnefloodplain. FloodFrequencyandOischarge The 10,50, 100, and 500-year floo<l events were used as the flood frequencies for this floodplain analys!s. Thus, the data developed In this report will be ComPilt lble not On Iy for regulat ion purposes and State of Colorado H. B. 10~1 desIgnations, but are also for Federal Insurance AdmInistration flood Insurance r"testudies. Table311scs the dIscharges and water svrfaceelevatlons for th ..10,50, 100, and 500-year flood events at s~lected r~f~rence points. T~ese various flood events have an average occurrence of OnCe in the number of years as Indicated. For example, thelOO-yearfloodoccurs (on the average) once In a IOO-year period and has a One percent chance of betng equaied or exceeded in any gIven year. The particular uses for the varIous flood events in addition to those stated above are as follows: IO-Year and SO-Year FlOOd Events. Information regarding these lo~r fre- quency floods is especially useful for future eng ineering studies and 1and~ use planning purposes related to minor road systems, minor channel improvev n>ents, and the location of p'Hks and recreational hcilities. agricultural lands, and appurtenant structures, For structures and uses of thi~ typ~ on the smaller tributaries and in areas wher~ the high risk of structural failure is economically feasible and the hazard to life and property non- existent. the uSe of the low.;,r frequency floods may be consldered. IOO'Year Flood Event. The lOO-year flood event may also ~e used for engineering design purposes wher~ a lower rIsk of failure than the IO.year or SO-year flOOd i. ~esircd. H""""c.-, th" 'ooH i.,purtant use of the IOO'y~ar flood event lies ir> floodplain designation and land-use regulation as set forth in the State statutes. The State of Colorado considers the IOOvyear frequency flood as the flood event to be used in designing and protecting structures and dwellings for Muman occupation. Therefore, many floodpl...in regulations are based upon the IOO'yearflood. Also, the area wMichwould be Inulldatedby thel00-year flood "'ay be de I in~ated as an area of State I nterest as Set forth In M. B. l041--t.~.. Stilte'sland-usebill.