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" " INTERPRETATION AND USE OF REPORT DATA SOQ-Vc"r Flood Event. The 500-yearfloodevcntis important in making the public aware that floods larger than the lOO-year flood can and do occur. Tne 500'year flood event can also be uscd for regulating high ri, kdevelop- mentswithinthefloOdplain. Table 3 lists the discharges and water surface elevations for the 10, 50, 100, and SOD-year flood events at selected reference points, Flood Frequency and DiSCharge The 10, 50, lOO..,nd500-yearflOOdevent,wereusedas the flood frequencies for this floOdplain analysis. Thus, thedatade'lelopedin this report will be compatible no! only for regulation purpose. and H.B. 1041 designations, butareillso for Federal Insurance Administrati an flood i,,,urancerate.tudie.. These ~arious fload event. have an average occurrence of OnCe in the number of years". indicated. Forex,lmple, the 100-yearfloodoccurs,on the average, once in a lOO-year period, and has a one percent chance of being equaled or exceeded in any given year. The particular uses far the ~arious flood event. in addition to tho.e stated above are as follows: IO-Yearand 50-Ye..r Flood Events. Informationreg..rdingtheselowcrfre_ qucncyfloods is especially useful for future engineering studies ,lnd land- u,e planning purpose. related to minor road system., minor channel improve- ments, the loc<ltian af parks and recre",tlonal facilities, agricultural lands, andappurtenant.tructures. For structures and uses of this type on the ,mailer tributaries and In areas where the high risk of Hructural failure is economically feasible and the hazard to life an<lproperty nun cxi,tent, lhcu,,,a'the iower frequency tload. may be considered. IOO-Ye,,, Flood Event. The IOO-year flOOd event may also be used far engi- ne"ring design purpose' where a lower ri.koffailure than the 10-yearor SO-ycartlood I,de,ireu. However, the most impartanteseofthe IOO-year flood event lies Infloodplainde,ignationand I,lnd-u.eregulat;<.>na"et fortn in the st.lte Hatu(es. The Statc of Colorada considers the IOO-year frequency flood ~, the flood event to be used in desi qn i nq and protect ing structure. and dwell ing; for hu",an occu~"Uon. Thprefore, many floodp);,in regui at ion s are based upon the 100-year flood. A I ~a, the area wh i ch woul d bc inundated by the 100-ye." fl'lOd indY be delineated '" an arc" of qate interest ~s .ct forth in H.B. 1041--tl1e State', lan<l-u"" bil i.