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FLOOD01680
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Last modified
11/23/2009 12:58:10 PM
Creation date
10/4/2006 10:16:25 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
126
County
Boulder
Community
Unincorporated Boulder County
Stream Name
St. Vrain Canyon upstream of Lyons
Title
Floodplain Information Report - South St. Vrain Canyon upstream of Lyons, Boulder County, CO
Date
2/1/1978
Designation Date
1/1/1979
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Location <br /> <br />South St. Vrain Creek <br /> <br />a. at mouth <br /> <br />b. at Immed. D/s of <br />confluence with M. <br />St. Vrain Creek <br /> <br />M. St. Vrain Creek <br /> <br />c. at mouth <br /> <br />d. at Peaceful Valley <br />(State Route 72 <br />Bridge) <br /> <br />Table 4 <br />PEAK DISCHARGES AT SELECTED LOCATIONS <br /> <br /> Mean <br />Drainage Watershed <br />Area Elevation <br />(Square Mile) (Feet) 10-year <br />92 9.040 1,400 <br />66.7 9,750 1,220 <br /> <br />32.4 <br />18.7 <br /> <br />9,620 <br />10,510 <br /> <br />590 <br />470 <br /> <br />Peak Discharge (cfs) <br />50-year 100-year <br /> <br />3,750 <br />2,790 <br /> <br />5,430 <br />3,990 <br /> <br />1,430 <br />860 <br /> <br />2,000 <br />1,180 <br /> <br />10 <br /> <br />500-year <br /> <br />11,900 <br />8,560 <br /> <br />4,070 <br />2,320 <br />
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