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<br />The discharge is comparable to a 100-year event. The extent of <br />inundation shown in this Flood Insurance Study is approximately <br />the same as that which occurred during the June 19B4 event. <br /> <br />Similar flooding problems as those outlined above could occur in <br />the flood plains of Niver Creek and Tributary L of Niver Creek in <br />the event of further development. <br /> <br />Much of Niver Creek's flood plain is in park land. However, down- <br />stream near Zuni Street, mobile homes are located in the approximate <br />flood plain. At the upstream end of Niver Creek, streets and <br />homes in low areas were affected during the June 1984 flood event. <br /> <br />A large portion of the Tributary L of Niver Creek flood plain is also <br />park land. There are proposals to develop a major theme park with <br />amusement rides and other significant structures upstream of Pecos <br />Street, which could be affected by flooding from this tributary. <br />Development downstream of Pecos Street has also been proposed, <br />with the same potential flood hazards involved. <br /> <br />2.4 Flood Protection Measures <br /> <br />A detention pond was constructed near Elm Court, at the upstream <br />limit of study for Tributary M of Niver Creek. This pond is designed <br />to attenuate the peak 100-year flow from 226 cfs to 200 cfs. <br /> <br />Nonstructural measures of flood protection are also used to aid in <br />the prevention of future flood damage. These are the result of <br />regulations of the Urban Drainage and Flood Control District-69, <br />which is located in Denver, Colorado. <br /> <br />3.0 ENGINEERING METHODS <br /> <br />For the flooding sources studied in detail in the community, standard <br />hydrologic and hydraulic study methods were used to determine the flood <br />hazard data required for this study. Flood events of a magnitude which <br />are expected to be equaled or exceeded once on the average during any <br />10-, 50-, 100-, or 500-year period (recurrence interval) have been selected <br />as having special significance for flood plain management and for flood <br />insurance rates. These events, commonly termed the 10-, 50-, 100-, and <br />500-year floods, have a 10, 2, 1, and 0.2 percent chance, respectively, <br />of being equaled or exceeded during any year. Although the recurrence <br />interval represents the long term averag~ period between floods of a <br />specific magnitude, rare floods could occur at short intervals or even <br />within the same year. The risk of experiencing a rare flood increases <br />when periods greater than 1 year are considered. For example, the risk <br />of having a flood which equals or exceeds the 100-year flood (1 percent <br />chance of annual exceedence) in any 50-year period is approximately 40 <br />percent (4 in 10), and, for any 90-year period, the risk increases to <br />approximately 60 percent (6 in 10). The analyses reported herein reflect <br /> <br />5 <br />