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<br />. <br />. <br />0 <br />- <br />- <br />0 <br />. <br />. <br />. 100 <br />u <br />. <br />0 <br />. <br />. <br />- <br />. <br /> >0 <br /> <br />FIGURE <br /> <br />" <br />1000 <br /> <br />EXCEEOENCE PROBABILITY l%l <br />70 60 50 40 30 20 '0 ~ 2 I 0.5 0.2 0,1 <br /> <br />00 <br /> <br /> , <br /> / /' <br /> V- <br /> ! <br /> I <br /> I <br /> , , <br /> 1 <br /> , I I <br />I <br /> ~ -- -- - -- - <br /> <br />CHAPIERV <br /> <br />HYDRAULIC ANALYSIS <br /> <br />>0, <br /> <br />Hydraulic analysis for this study inCluded computation of water <br />surfaoe profiles alons Coal Creek through Crested Butte. Water surface <br />profiles were determined using the oross seotion of the ohannel, a <br />channel roughness ooeffioient, and bridge hydraulic and struotural <br />oh3racterhtlosutil1zing the Corps of Engineers IlEC-2 oompute.r program. <br />Results of the 10-, 50-, 100-, and 500 year frequenoy flood computations <br />are shown in Table I. The 100 year frequency flood profile Is presented <br />in plates 8 through 10. Cross sections used were those obtained from a <br />field survey provided by the Colorado Water conservation Board. The <br />looation of the oross seotions Bre shown on the flOOded area maps for <br />thelOO-yearfloodpresentedtnPlate_s3through7,andontheflood <br />profiles onPlatea 8 through 10. <br /> <br />Water surfaoe elevations present~d in Table 1 are based on com_ <br />putations assuming no reduotions in the ohannel or hydraulic struotures <br />conveyanoe oapabilities. Suoh reduotions, duo to debris acoumulation, <br />nre likely to ooour during flood Ho", period" re",dting in higl",r ",.t..r <br />surface elevation". 1t is reo"",,"enaea that the oonveyance capa"itIe~ <br />for both channel and hydraulio ~truotures (primarily bridges) be kept <br />clear of debris at all times. Thi8 oan he aocompllshed thrnugh II <br />regular maintenance program and onsite cleaning operations during flood <br />periods. <br /> <br />" <br />" <br /> <br />30 .0 50 W ro $0 90 9~ 98 99 <br />RfCUllllfNCf'lIfQUftlcr(v..,.l <br /> <br />9',1899' <br /> <br />99.99 <br /> <br />CRESTEO BuTTE FLOOO PLAN <br />INFORMATION STUDY <br /> <br />PEAK FLOOD PROBABILITY <br /> <br />11 <br /> <br />'10- <br />