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<br />CDM <br /> <br />environmental engineers, scientists, <br />planners, & management consultants <br /> <br />Apri 1 17, 1978 <br /> <br />''-'/ ',~:j <br />,( 'i" <br /> <br />CAMP DRESSER & McKEE INC. <br /> <br />Writer's Tower, Suite 1100 <br />1660 South Albion Street, Denver. Colorado 80222 <br />303758-4351 <br /> <br /> <br />r ~@lliRW~mJ <br />. A'PR 1 9 1979 ~i; <br />u.. <br />"-'-- ...:..J/ <br />COLO. w,-. r~;( <br />CONSERVATION BOARD <br /> <br />Mr. Larry Lang, Chief <br />Flood Control and Conservation Section <br />Colorado Water Conservation Board <br />823 State Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br /> <br />Dear Mr. Lang: <br /> <br />Floodplain Study of St. Vrain Canyon <br />CDM 711-1-RT <br /> <br />Our hydrologic analysis for the St. Vrain Canyon, west of Lyons, Colorado, <br />was reviewed and discussed with Mr. Bill Stanton of your office on <br />April 14, 1978. A copy of the computations and results was handed to him <br />for your reference. <br /> <br />As submitted, discharges for the study reaches on S. St. Vrain Creek <br />and M. St. Vrain Creek were computed using the station values at "Lyons <br />gage" and "near Ward gage," respectively, in conjunction with the regression <br />relationships developed from ten (10) gaging stations in the St. Vrain <br />Creek and Big Thompson River basins. The discharges thus obtained at <br />various locations in the study reaches are tabulated as follows: <br />Drainage Basin <br />Area Elevation <br />(sq. mi.) (feet) <br /> <br />Location <br /> <br />S. St. Vrain Creek <br />l. at Mouth <br />2. at Inmed. D/S of <br /> confluence with <br /> M. St. Vrain Creek <br />M. St. Vrain Creek <br />3. at Mouth <br />4. at Peaceful Valley <br /> (State Route 160 <br /> Bridge) <br /> <br />10-vr <br /> <br />Discharge (cfs) <br />50-yr 100-vr <br /> <br />500-vr <br /> <br />92 <br /> <br />9,040 <br /> <br />1,520 3,510 <br /> <br />6,380 14,980 <br /> <br />66.7 <br /> <br />9,750 <br /> <br />1,190 2,600 <br /> <br />3,070 5,620 <br /> <br />32.4 <br /> <br />9,620 <br /> <br />640 1,010 <br /> <br />2,260 5,430 <br /> <br />18.7 <br /> <br />10,510 <br /> <br />420 610 <br /> <br />880 1 ,630 <br /> <br />