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<br />Blue River (above Breckenridge) were chosen from contiguous <br />studies. <br /> <br />CrDss sections were obtained through field surveys, existing <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 8arton Gulch <br />Sanke River <br /> <br />North FDrk Snake River <br /> <br />Tenmile Creek <br /> <br />Meadow Creek <br /> <br />Miners Creek <br /> <br />8lue 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 />Channel rDughness 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 <br /> <br />Blue River (Above Dillon) <br />Blue River (Above Breckenridge) <br />Swan River <br />French Creek <br />South Barton Gulch <br />Snake River <br />North Fork Snake River <br />Meadow Creek <br />Miners Creek <br />Tenmile Creek <br />No Name Creek <br />Jug Creek <br /> <br />Channel <br /> <br />0.060-0.065 <br />0.052-0.080 <br />0.035-0.080 <br />0.035 <br />0.120 <br />0.040-0,045 <br />0,045-0.060 <br />0.025-0.080 <br />0.060-0.100 <br />0.040-0,100 <br />0.030-0.040 <br />0.035-0.045 <br /> <br />Overbank <br /> <br />0,100-0.120 <br />0.070-0.150 <br />0.060-0.100 <br />0.035-0.050 <br />0.150 <br />0.080 <br />0.080 <br />0.035-0.200 <br />0.100-0.150 <br />0.060-0,160 <br />0.040-0.050 <br />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 />36 <br />