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<br />I <br />I <br />I <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br /> <br />I <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />precipitation record on the depth-duration-frequency statistics for the City of Fort Collins. The City <br /> <br /> <br />of Fort Collins currently uses a 2 hour event for drainage design hydrologic analyses. <br /> <br />B. <br /> <br />PURPOSE <br /> <br />The purpose of this report is to provide the City of Fort Collins with a precipitation frequency analysis <br />(statistical analysis) that will access the impact of the additional period of record on the rainfall statistics <br />currently being used for drainage design and. depending on the study results, recommend the use of <br />new depth-duration-frequency and intensity-duration-frequency curves for use in the updated version <br />of their criteria manual. <br /> <br />In addition to the statistical analysis, a qualitative precipitation study (qualitative study) was also <br /> <br /> <br />performed. The purpose of the qualitative precipitation study was to investigate the question of whether <br /> <br /> <br />there is a significant difference in the amount of rainfall that falls on the western part of the City of Fort <br /> <br /> <br />Collins as compared to the amount of rainfall that falls on the eastern part of the City. The data used in <br /> <br /> <br />the study was obtained from the Mountain States Weather Services and included weather watcher reports <br /> <br /> <br />from the largest storms in the Fort Collins area over the last fourteen years. <br /> <br />C. <br /> <br />COORDINATION: <br /> <br />This study was performed with the guidance of a technical advisory committee composed of the <br />following individuals: <br />Susan Hayes <br />Robert Smith <br />Dr. Duane Boes <br />Tom Browning <br />Rex Bums <br />Lisa Dunn <br />Bob Davidson <br />Nolan Doesken <br />Dave Frick <br />Don Heyse <br />John Liou <br />Larry Lang <br />John Morris <br />Dr. Thomas Sanders <br /> <br />Stormwater Utility (Project Coordinator) <br />Stormwater Utility <br />CSU Statistics Department <br />Colorado Water Conservation Board <br />Larimer County Engineering <br />Larimer County Engineering <br />Fort Collins <br />CSU Atmospheric Sciences Department <br />Ayres & Associates <br />CSU Chemistry Department <br />FEMA Denver. Co. <br />Colorado Water Conservation Board <br />CSU Facilities Department <br />CSU Civil Engineering Department <br /> <br />-2- <br />