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<br />;; <br /> <br />, <br />I <br /> <br />due to rlinfall were separated. Using log-Pearson Type III distri- <br />bution, ~he 10-, 50-, 100-, and 500-year recurrence interval <br />discharg~s were obtained separately for snowmelt events and rainfall <br />events (Reference 5). The data showed that, except for small <br />drainagei basins (less than 10 square miles), the snowmelt events <br />yielded ~igher discharge peaks than the rainfall events for the <br />flow freFl-uencies used in this study. Using snowmelt event gage <br />records,' regression equations were developed for the 10-, 50.'., <br />100-, anfj 500-year recurrence interval discharges as a function of <br />drainagel area. <br /> <br />Flood discharges for Meadow Creek were determined by modifying the <br />drainagel area-discharge relationships to include the effect of <br />rainfalll events on smaller drainage basins using a synthetic <br />hydro graph approach. <br />i <br /> <br />A detailbd description of the hydrologic analyses for this s1:udy <br />is cover~d in a technical addendum entitled, Hydrology Report, <br />Plood Inisurance Study, summit County, Colorado, submitted to the <br />Federal IInsurance Administration and the Colorado Water Conservation <br />Board (Reference 6). <br /> <br />Peak dispharge-drainage area relationships for Tenmile and Meadow <br />Creeks aire shown in Table 1. <br /> <br />" <br /> <br />Table 1. Summary of Discharges <br /> <br />Flooding Sourc~ <br />and Location I <br /> <br />Drainage Area <br />(Square Miles) <br /> <br />Peak Discharges <br />(Cubic Feet per Second) <br />10-Year 50-Year 100-Year SOO-Year <br /> <br />Tenmile Creek <br />At Lake Dillon <br />Below North Tenm~le <br />Creek Gage No. 1501 <br />Above Confluencei With <br />North Tenmile C~eek <br />I <br /> <br />94.2 <br /> <br />1500 <br /> <br />1820 <br /> <br />1980 <br /> <br />2190 <br /> <br />93.3 <br /> <br />1450 <br /> <br />1780 <br /> <br />1900 <br /> <br />2130 <br /> <br />79.0 <br /> <br />1335 <br /> <br />1590 <br /> <br />1710 <br /> <br />1910 <br /> <br />Meadow Creek <br />At Lake Dillon ! 5.8 125 175 280 340 <br />I <br />Upstream From Confluence <br />. I <br />Wlth South Forkl <br />Meadow Creek I 4.7 110 160 230 330 <br />I <br />3 2 ,i <br />. Hydraullp Analyses <br />I <br />i <br />Analysesl of the hydraulic characteristics of streams in the community <br />were car~ied out to provide estimates of the elevations of floods <br />of the sblected recurrence intervals along each stream studied in <br />the comm~.mi ty . <br />I <br /> <br />5 <br /> <br />