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INVESTIGATIONS AND ANALYSIS Inte~D~etation and Use of ReDo~t A. F~equency and DIscha~ge The 10-, 50-, 100-, and 500-yea~ flood events a~e used as the flood f~equencies fo~ this flood plain analysis. Thus, the data developed In this ~epo~t wi I I be suitable not only fo~ ~egulation pu~poses, and H.B. 1041 designation but is also consistent with Fede~al Insu~ance Administ~atlon flood insu~ance studies conducted by the Fede~al Eme~gency Management Agency. These va~ious flood events have an ave~age occu~ance of once In the numbe~ of yea~s as Indicated. Fo~ example, the 100- yea~ flood occu~s, on the ave~age, once in a 100-yea~ pe~iod, and has a one pe~cent chance of being equaled o~ exceeded in any given yea~. The pa~ticula~ uses fo~ the va~ious flood events in addition to those stated above a~e as fo II OW5: 10-yea~ and 50-yea~ Flood Events Info~mation ~ega~ding these lowe~ f~equency floods is especially useful fo~ futu~e enginee~ing studies and land use planning pu~poses ~elated to mino~ ~oad systems, mino~ channel imp~ovements, the location of pa~ks and ~ec~eational faci I Ities, ag~icultu~al lands, and appu~tenant st~uctu~es. The use of the I owe ~ f ~equency floods may be cons I de ~ed in planning flood p~evention p~ojects to p~otect ag~Icultu~al a~eas, o~ othe~ p~ope~ty whe~e ~isk to I ife is not a facto~. 100-yea~ Flood Event The 100-yea~ flood event may be used in I I eu of lower f~equencies fo~ enginee~Ing design pu~poses whe~e g~eate~ secu~ity f~om st~uctu~e failu~e is desi~ed. Howeve~, the most impo~tant use of the 100-yea~ flood event I ies in flood plain management and land use planning as set fo~th in the state statutes. The State of Colo~ado and the Fede~al Gove~nment conside~s the 100-yea~ f~equency flood as the flood event to be used in designing and p~otecting st~uctu~es and dwe II i ngs fo~ human occupati on. The~efo~e, a I I flood p I a I n ~egu I at i ons a~e based upon the 100-yea~ flood. 8