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<br />e <br /> <br /> Table 8 <br />Routing Reach Parameters (Most Upstream Point to McPhee Reservoir) <br />Reach Length Upstream Downstream Upstream Downstream Slope <br />ID# (mi) Subbasin and Subbasin and Elevation Elevation (ft/mi) <br />Junction Name or # Junction Name or # (ft) (ft) <br /> Dolores Headwaters Dolores Upper Mid & <br />R620 10.5 Bear Creek 8420 7920 47.8 <br /> Dolores below Rico* JR630 <br /> Dolores Upper Mid & West Fork Dolores & <br />R630 11.3 Bear Creek Dolores Mid 7920 7360 49.7 <br /> JR630 JR810 <br /> West Fork Dolores & Dolores Lower <br />R810 14.6 Dolores Mid 7360 6950 28.1 <br /> JR810 Dolores at Dolores <br /> Dolores Lower Dolores Out &Lost <br />R780 3.9 Canyon Creek Out 6950 6920 7.7 <br /> Dolores at Dolores* JR800 <br /> Lost Canyon Creek Dolores Out &Lost <br />R760 3.4 Canyon Creek Out 7030 6920 32.7 <br />Lost Canyon Creek near JR800 <br /> Dolores* <br /> Dolores Out & Lost Dolores Lower out <br />R800 0.4 Canyon Creek Out 6920 6890 75.1 <br /> JR800 McPhee In <br />*Gaged locations <br />Length The length (mi) of the reach from an upstream junction to a downstream junction. <br />Junctions Are points of reference, and represent confluence of routing reaches and subbasins. <br />Elevation This is the elevation of the reach at the junction point. <br />Slope Slope is calculated as (upstream elevation - downstream elevation) / reach length in miles <br /> <br />e <br /> <br />The Muskingum method was used in the 1976 HEC-l model to reproduce the 1970 flood <br /> <br />event. The routing parameters for each channel routing reach are: Muskingum X, Muskingum K, <br /> <br />and the number of sub-reaches. Muskingum X is a weighting factor between 0.0 and 0.5. The <br /> <br />Muskingum X of 0.4 used for the HEC model was also used for the HMS model. Muskingum K, <br /> <br />the travel time in hours for each routing reach, is the routing reach length (in miles) divided by the <br /> <br />velocity (miles per hour). The HMS model used to reproduce the 1970 flood event took into <br /> <br />consideration an approximate time of peak at the Rico gage and how much later the peak flow <br /> <br />was observed at the Dolores gage. From the time difference and length of the channel between <br /> <br />e <br /> <br />the Rico and Dolores gages, a channel velocity of 5.0 miles per hour was estimated for use in the <br /> <br />21 <br />