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<br />Development of Estimared Daily Flows - Yampa River ar Maybell <br /> <br />Steamboat. From these, travel time contours were drawn, and the traveltime from any basin <br />location to the Maybell gage was then estimated using the contours. <br /> <br />Average velocities between the selected locations were estimated using a uniform flow, <br />channel geometry and slope assumptions. The channel geometries were estimated from USGS <br />7.5 minute quadrangle maps. Slopes were estimated from the elevations recorded in the USGS <br />Water Resources Data report for the gages, and the river mile information provided by <br />Division 6. The Manning equation was used for computing the average velocity as: <br /> <br />v = 1.49 R2IJSl/2 <br />n <br /> <br />where n = Manning's coefficient <br />S = average slope = (elevation difference/distance) <br />R = hydraulic radius = (ArealWetted Perimeter) <br /> <br />The travel time between two locations was then estimated as the river distance divided by <br />the average velocity. Parameters used for estimating the average velocity in the four reaches <br />defined are given in Table 3. <br /> <br />Table 3 <br />Parameters Used for Computing Average Travel Times <br /> <br /> Yampa Yampa Elk Yampa <br /> River River River River <br /> Craig to Steamboat to Clark to Stagecoach to <br /> Maybell Craig Confluence Steamboat <br />Manning's coefficient 0.05 0.05 0.05 0.05 <br />Change in Elevation (ft) 199.77 595.47 747.75 544.53 <br />Distance (miles) 55.75 54.75 22.40 19.50 <br />Average slope 0.0007 0.0021 0.0063 0.0053 <br />Average flow area (ft2) 500 279 100 225 <br />Average wetted perimeter (ft) 230 186 80 150 <br />Hydraulic radius (ft) 2.17 1.50 1.25 1.50 <br />Average flow velocity (ft/sec) 1.30 1.77 2.75 2.84 <br />Average travel time (days) 2.62 1.89 0.50 0.42 <br /> <br />Q <br />