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FLOOD03677
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Last modified
1/25/2010 6:27:57 PM
Creation date
10/4/2006 11:56:06 PM
Metadata
Fields
Template:
Floodplain Documents
County
Larimer
Community
Fort Collins
Stream Name
Dry Creek
Basin
South Platte
Title
Major Drainageway Planning Dry Creek Technical Addendum
Date
4/1/1980
Prepared For
Larimer County
Prepared By
Gingery Associates, Inc.
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />-- <br /> <br />11 <br />I <br />11 <br />II <br />II <br /> <br />I <br />, <br />il <br />I <br />II <br /> <br />I <br /> <br />II <br />t <br />:1 <br />I <br />II <br /> <br />I <br /> <br />~I <br /> <br />, <br /> <br />ill <br /> <br />'! <br /> <br />11 <br />I <br />1;1 <br /> <br />'I <br /> <br />I <br />ill <br />I <br />II <br />,II <br /> <br />III <br />,I <br /> <br />to the U. S. Highway 287 crossing. The discharges determined <br /> <br />ln this analysis are shown in Table II. <br /> <br />Table II. FIS Hydrology <br /> Discharge (ds) <br /> Poudre River U. S. 287 <br />Flood Event Confluence Crossing <br />10-Year 1,610 1,190 <br />50-Year 2,930 2,230 <br />100-Year 3,480 2,650 <br />500-Year 5,200 4,100 <br /> <br />These discharges were determined using the Soil Conservation <br /> <br />Service's Unit Hydrograph Method utilizing curve numbers. <br /> <br />Rainfall was taken from the NOAA Atlas (Reference 7). Soil <br /> <br />loss rates were determined from county soil maps developed <br /> <br />by the Soil Conservation Service (Reference 8). <br /> <br />The Douglas Reservoir hydrology study completed for the <br /> <br />irrigation ditch company used methods described in "Design of <br /> <br />" \ <br />,'J '.' I <br />. ,..:.,"f.<c <br />
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