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<br />3.1 Hydrologic Analyses <br /> <br />Hydrologic analyses were carried out to establish the peak <br />di~charge-frequency relationships for floods of the selected <br />reCUrrence intervals for each stream studied in detail in the <br />community. <br /> <br />The 10-, 50-, 100-, and 500-year-recurrence-interval discharges <br />for the streams within the Town of Breckenridge have been included <br />in a report entitled "Flood Plain Information, Breckenridge, <br />Colorado," prepared for the Colorado Water Conservation Board <br />(Reference 1). The frequency discharges in this report were _ <br />~ <br />determined using the MITCAT hydrology model to develop synthetic <br />hydrographs in the various basins (Reference 5). The MITCAT <br />hydrology model is a general purpose simulation model that uses a <br />kinematic wave function to derive runoff for synthetic stonms. <br />These discharges were compared with a study, entitled "Hydrology <br />Report, Summit County," prepared for the Federal Insurance <br />Administration (Reference 6). This report used a regional <br />analysis of streamflow gaging records to develop regression <br />equations for 10-, 50-, 100-, and 500-year-recurrence- interval <br />discharges for Summit County. The report used 326 years of <br />records from 14 gage sites within the Blue River basin. The <br />discharge-frequency data developed in the Colorado Water <br />Conservation Board report were supported by the results of the <br />Federal Insurance Administration report and were, therefore, <br />adopted for use in this study. <br /> <br />Peak discharge-drainage area relationships for Blue River Middle <br />Branch and Lehman, Illinois, and Sawmill Gulches are shown in <br />Table 1, "Summary of Discharges." <br /> <br />6 <br />