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The 10-, 50-, <br /> <br />100-, and SOO-year flood events were used as the flood frequencies for this <br /> <br /> <br />study. <br /> <br />These flood events have a probability of occurring one 1n the number <br /> <br /> <br />of years as indicated. For example, the 100-year flood has a one percent <br /> <br /> <br />chance of occurring in anyone given year. <br /> <br />Information related to the 10- and 50-year floods could be used by the <br /> <br /> <br />local jurisdictions for planning purposes. They could be used in future <br /> <br /> <br />planning and design efforts related to various land use activities, such as <br /> <br /> <br />the design of roads and bridges, minor channel improvements, the planning <br /> <br /> <br />of parks and recreational facilities, and other types of hydraulic structures. <br /> <br />I <br /> <br />The 1% chance flood flows may also be used for those planning and design <br /> <br />activities mentioned in connection with the 10- and 50-year flood flows. <br /> <br /> <br />This is particularly true where a lower risk of failure than the 10- or 50- <br /> <br /> <br />year flood is desired. The most important use of the 1% chance flood flow <br /> <br />is for the description of the floodplain and its land use regulation. The <br /> <br /> <br />Colorado state statutes consider the 1% chance flood as the flood event to <br /> <br /> <br />be used in designing and protecting improvements slated for human occupa- <br /> <br />tion. Also, the land within this flood area may be delineated as an area <br /> <br />of state interest as set forth in H.D. 1041 (State's Land Use Bill). The <br /> <br /> <br />1% flood is almost accepted nationally for the above mentioned purposes. <br /> <br />1 <br /> <br />The SOO-year flood event is useful 1n making the public aware that <br /> <br />floods greater than the 1% chance flood do occur, and those living above <br /> <br /> <br />the water surface elevations for such a flood event are not fully protected <br /> <br /> <br />from flooding, <br /> <br />-28- <br />