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<br />I <br />I <br />:1 <br />I <br /> <br />il <br /> <br />il <br />I <br />'I <br /> <br />I <br /> <br />I <br />I <br />I <br />,I <br />I <br />il <br />II <br />I <br />I <br />I <br />I <br /> <br />INTERPRETATION AND USE OF REPORT DATA <br /> <br />FLOOD FREOUENCY AND DISCHARGE <br /> <br />The 10, 50, 100, 500 year flood events were used as the flood frequencies for this floodplain <br />analysis. Thus the data developed in this report will be compatible not only for regulation <br />purposes, but also for Federal Insurance Administration flood insurance rate studies. <br />The various flood events have an average occurrence of once in the number of years as <br />indicated. For example, the 100 year flood occurs, on the average, once in a 100 year period, and <br />has a I percent chance of being equaled or exceeded in any given year, <br /> <br />100 Year Flood Event <br /> <br />The 100 year event may also be used for engineering design purposes where a lower risk of <br />failure than the 10 or 50 year flood is desired. However, the most important use of the 100 year <br />flood event lies in floodplain designation and land use regulation as set forth in the State statutes. <br />The State of Colorado considers the 100 year frequency flood as the flood event to be used in <br />designing and protecting structures and dwellings for human occupation. Therefore, all floodplain <br />regulations are based upon the 100 year flood, Also, the area which would be inundated by the <br />100 year flood may be delineated as an area of State interest as set forth in the State's land use <br />bill. <br /> <br />500 Year Flood Event <br /> <br />The 500 year flood event is useful in making the public aware that floods larger than the 100 <br />year flood can and do occur. Even though a person is living above the 100 flood boundary, this <br />does not mean that they are completely safe from flooding. The 500 year flood event can also be <br />used for regulating high risk developments within the flood plain such as nuclear power plants, or <br />the storage or manufacture of toxic or explosive materials. <br />Details of the flood frequency analysis is included in the Technical Addendum. <br /> <br />FLOODED AREAS <br /> <br />The 100 year flood has been selected by the State of Colorado as the flood event to be used to <br />determine floodplain delineation and regulation. Thus the flooded area map shows only the <br />boundaries of the 100 year floodplain and 100 year floodway. <br />The area delineated on the Flooded Area map as the 100 year floodplain meets- the <br />requirements as an area of State interest. Also upon official approval of this report by Colorado <br />Water Conservation Board, the area outlined by the 100 year flood boundary will be designated a <br />floodplain area and may be regulated accordingly by the local officials, <br /> <br />7 <br />