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FLOOD03888
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Last modified
1/25/2010 6:44:39 PM
Creation date
10/5/2006 12:09:50 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
388
County
Summit
Community
Unincorporated Summit County
Basin
Colorado Mainstem
Title
Flood Insurance Study - Summit County, CO, Unincorporated Areas
Date
11/1/1994
Designation Date
11/1/1994
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />Blue River (above Breckenridge) were chosen from contiguous <br />studies. <br /> <br />ross see 10n8 were 0 Sine roug ield surveys, exi9LiIl~ <br />topographic maps, and/or previous HEC-2 input data as follows: <br /> <br />Blue River (above Dillon) <br />Blue River (above Breckenridge) <br /> <br />Swan River <br />French Gulch <br /> <br />South Barton Gulch <br />Sanke River <br /> <br />North Fork Snake River <br /> <br />Tenmile Creek <br /> <br />Meadow Creek <br /> <br />Miners Creek <br /> <br />Blue River (above Blue River) <br /> <br />No Name Creek <br />Jug Creek <br /> <br />Surveys and Topographic Maps <br />Surveys, Topographic Maps, <br />and HEC-2 data <br />Surveys <br />Surveys, Topographic Maps, <br />and HEC-2 data <br />Surveys <br />Surveys (structures only) and <br />Topographic Maps <br />Surveys (structures only) and <br />Topographic Maps <br />Surveys, Topographic Maps, <br />and HEC-2 data <br />Surveys, Topographic Maps, <br />and HEC-2 data <br />Surveys, Topographic Maps, <br />and HEC-2 data <br />Approximately Study Reach: <br />Field Reconnaissance and <br />structures measured <br />Topographic Maps <br />Topographic Maps <br /> <br />. <br /> <br />Channel roughness factors used in the hydraulic computations were <br />chosen by engineering judgment and based on field observations of <br />the streams and floodplain areas. The ranges of "n" values for <br />the streams in this study are as follows: <br /> <br />Stream Name Channel Overbank <br /> --------- <br />Blue River (Above Dillon) 0.060-0.065 0.100-0.120 <br />Blue River (Above Breckenridge) 0.052-0.080 0.070-0.150 <br />Swan River 0.035-0.080 0.060-0.100 <br />French Creek 0.035 0.035-0.050 <br />South Barton Gulch 0.120 0.150 <br />Snake River 0.040-0.045 0.080 <br />North Fork Snake River 0.045-0.060 0.080 <br />Meadow Creek 0.025-0.080 0.035-0.200 <br />Miners Creek 0.060-0.100 0.100-0.150 <br />Tenmile Creek 0.040-0.100 0.060-0.160 <br />No Name Creek 0.030-0.040 0.040-0.050 <br />Jug Creek 0.035-0.045 0.040-0.050 <br /> <br />The split flow option of HEC-2 was used to determine the quantity <br />of flow leaving the channel banks of the Blue River (above <br />Dillon) and the flow leaving the banks of Tenmile Creek. The <br /> <br />32 <br />
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