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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />I iMS model. The IIMS model is currently set up for IS-minute time ordinates; the number of <br /> <br />sub4feaches used for each routing reach is the whole number of IS-minute increments in the travel <br /> <br />lime for that reach. The Muskingum X, Muskingum K and number of sub-reaches computed for <br /> <br />each routing reach in the HMS model for the 1970 event arc listed on Table 9. <br /> <br /> Table 9 <br /> .\Iuskingum Parameters <br /> (:\losl Upslream Poinllo ~lcPhee Resen'oir) <br />RC3chNamc Length Muskingum Muskingum Number of Slope <br />ID' (mi) K(hrs) X Sub-Reaches (ftlmi) <br />R620 10.5 2.' 0.40 8 47.8 <br />RfJ]O II.J 23 0.40 'I 49.7 <br />R810 14.6 2.9 0.40 12 28.1 <br />R780 3' 0.8 0.40 3 7.7 <br />R760 34 0.7 0040 3 32.6 <br />R800 04 0.] 0.40 ] 75.1 <br /> <br />6.8 Precipitation Used for 1970 Flood Reproduction. A regional isohyetaJ map <br />developed by the National Weather Service (Plate 9) was used to distribute precipitation for the <br /> <br />1970 flood simulation (Reference 4-j). Hourly precipitation records arc available from the <br /> <br />Pleasant View, Mesa Verde National Park. Durango. Telluride. Silverton and Ouray gage <br /> <br />locations. The Silverton precipitation distribution pattern was selccted as best representing the <br /> <br />timing and magnitude of pcak runoff observed at Rico and Dolores; and the user gage weighting <br /> <br />method was used for the 1970 HEC-HMS model. Each subbasin was apportioned precipitation <br />based on the isohyetal map and orographic considerations Crable 10). <br /> <br />22 <br />