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<br /> COWRADO RiVER HYDROLOGIC ANALYSIS POINTS <br />HYDROLOGIC LOCATION DRAINAGE DA- <br />"'mT , ARfA(DA.) SOURCE <br />Cl ABOVE RIFLE CR 6730mi' . <br />CT BFLOWRiFLECR 6930mi' . <br /><> ABOVE PARACHlJIT CR 7130mi' , <br />C' aELOw PARACHUn;; CR 7330mi' , <br />C' OEBEQVE GAGE 7370mi' , <br />C' BELOW ROAN CR 7S9Smi' , <br />CT CAMEO GAGE EOSOmi' , <br />C, BELOW PLATEAU CR 8700mi' . <br />C' PALISADE GAGE E7S3mi' , <br />CIO BELOW GUNNISON RIVER 168S3 mi' , <br />Cll FRUlTA, FEMA DlS STUDY LIMIT 17100mi' , <br />C" ABOVE SALT WASH 17429mi' , <br />Cll STATELINE GAGE (IJ MJ VIS) 17843 mi' , <br /> ~" '''''' ". <br /> <br />TABLE 2 <br /> <br />uncommon on the Colorado River. is characterized by high peak flows and moderate duration of <br />floodflows. Tbunderstorms result in higb peak flows, short duration of flows. and small volwnc <br />ofnmoff. Historically, snowmelt bas caused the greatest flooding 011 the Colorado and Gurmison <br />Rivers with augmentation from rain addillg to some historical peak flo'WS. The largest known <br />snowmelt flood on the Colorado and Gunnison Rivers was in July, 1884 with an estimated flow <br />at Fruita of 125,000 cfs. Other significanl flood events occurred in 1917, 1920, 1921, 1935. <br />1952,1957,1983, and 1984. The 1984 noooof70,OOO cfs al the Statc Line was at a frequency <br />of slightly less than once in 50 years <br /> <br />a Determined from published US Army CO<JIS of En~inew: or.d FEMA information <br />h D.'.......ined (rrnn rl.n;m<''''''g "n4 r"Mi,~ed ~bu'ary info,",.ti~n <br />C USGS gage infO<ll1alion <br /> <br />flgElr/!4 shows the study reach and each of the hydrologic analysis points listed in T4hle 1. <br /> <br />2.5 Flood Characteristics <br /> <br />Major flooding in the Culorado River basin has beell primarily the result ofrapid Sf\O\VIIlclt which <br />lypically begins in latc April. Snowmelt flooding can continue into early July. Flooding can also <br />occur from rainfall on snowmelt in latc WInter or early spring. Due to the small areal extent and <br />limited duration of thunderstorms, they do not typically constitute a major flood threat on .treams <br />as large as the Colorado River. They do, howevCT, pose 1I probk-m for ""me (If Ihe smaller <br />tributaries in the Colorado River basin. <br /> <br />Snov.melt flooding is characterilCd by modcratc peak f1ow~, large volumc of runoff, long <br />duration, and diurnal fluctuation of flow. Flooding from general rainfall alone, though <br /> <br />T <br /> <br />" <br />