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<br />FLOOD HISTORY <br /> <br />The folla~ing table ie n selection of data fran limIted stre~~IQW <br /> <br />Major floodirg along stre~s in this study is CalSed by rapid melting <br />of the nDUntain ~ck during late May to early July as well as SUTTTJer <br />rainstorms. There is also the potentIal for floodirg lIS a result of <br />raInfall occurrirg on melting snow. The sno<..tllelt floods are dlaractedzed <br /> <br />information available; <br /> <br />'The size of drai.!wge area varies frcrn Porcupine Creek (9.7 square <br /> <br /> Streamflow ~laxi=Discha.rge <br />Stream Station ____(cfs) Date <br /> ------ <br />Elk Creek 130 1400 :1ay27, 1922 <br /> 9087500 1770 June 10, 1957 <br /> 9087500 1560 May 28, 1958 <br />West Divide Creek 132 876 May 13, 1941 <br /> 9089500 53S June 4, 1957 <br /> 9089500 1410 May 14, 1984 <br />CanyonCreffi 9085500 1000 June 29, 1957 <br /> 9085200 966 June19,1983 <br />Mamn Creek 9091100 430 June 6, 1984 <br />Beaver Creek 9092500 " June 5, 1957 <br /> 9092500 85 11ay24, 1964 <br />Source: Water Resource Data, COlorado U.S. Geological Survey. <br /> <br />by rroderate peaks, large IA:llunes, and lo~ durations. The SUTTTJer floods <br /> <br />have characteristics of high peaks, short flow durations, and relatively <br /> <br />small vt:llunes. <br /> <br />miles) to Io;lk Creek (177 square miles) and DiVide Creek (200 square <br />miles). Therefore. the flood season may vary frcm snownelt flooding in <br /> <br />May on Divide Cretk to a thunderatoI1ll flashflood in August on Porcupine <br /> <br />Creek. <br /> <br />Most of the stream.s do not haY(! stream gage devices to help t'ecot'd <br />their flood history. The sparce information available sOOws 1957 to be a <br /> <br />high snow pack year .tIich produced high spring runoff in many COlorado <br /> <br />river tributaries. Canyon Creek flowed 1000 cfs on JUIe 29. WE'llt Divide <br /> <br />Creek flowed 535 cis 00 June 4, and r:lk Greek flowed !770 ds 00 May 10. <br />The sp:rtng of 191:14 was also a high runoff period with llaJJu Cree.: flowing <br />430 cis on June 5, and West Divide Creek flowing 1410 cis 00 May 14. <br /> <br />There is no published history of floodirg on Porcupine Cree.: however, <br />iieldobservations iooicate it is an active flooding stream frCfll SI.1llIller <br />rainstorm. ~tre<lllflow data on Ileaver Creek indicates it has never fL~d <br /> <br />more than 100 cfs, the maximun of record is 85 ds on May 24, 1964. There <br /> <br />does "Ppe<lr to be a si!11iftC!ll1t difference in "'''terahed chat'acteristics <br />bet'W<.'Cl1 Porcupine and Beaver Creeks, Sl.lCh 8.Ii type and corxIition of <br />vegetation, eVen though they are a.ljacent drninages. <br /> <br />, <br /> <br />8 <br />