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<br />The two-dimensional modeling results in this report are from uncalibrated model runs <br /> <br />of the IS-Mile reach at 2000cfs and calibrated runs of the Duffy Tunnel reach at 600cfs. <br /> <br />Calibration provides a confidence level for the model output. While uncalibrated model runs <br /> <br />should not be used to draw definitive connections between habitat availability and fish habitat <br /> <br />utilization, the nature of the data strongly indicates the types of habitat and the relationships <br /> <br />that should be found in further analysis. This data is preliminary and will be undergoing <br /> <br />substantial revision between June. and August 2000. <br /> <br />Meso-habitat units were broken out into ranges of depth and velocity for preliminary <br /> <br />analysis (Table 9). The analysis of the IS-Mile reach data suggests that most of the reach has <br /> <br />velocities between 0.6 and 1.5 m/s with depths above 0.5m at a discharge of2000cfs. The <br /> <br />Duffy Tunnel reach has much lower velocities with almost 74% of the velocities falling <br /> <br />between O.IS and 0.6 m/s at a discharge of600 cfs. The IS-Mile reach data presented here is <br />0,:.. <br /> <br />based on a flow of 2000 cfsbut further analysis will examine discharges in this area down to <br /> <br />100 cfs. The Duffy Tunnel. data presented here is.based on a discharge of 600 cfs and further <br /> <br />analysis will examine discharges down to 50 cfs. The discharges shown here are <br /> <br />representative of typical summer discharges on the reaches of interest and represent the <br /> <br />highest discharges that will be modeled for those reaches. Based on 9 years of data from the <br /> <br />Palisade gage just upstream for the 15 mile reach, the median daily flow on the Duffy Tunnel <br /> <br />reach was less than 2000 cfs for 210 days of the year. On the Yampa River, 81 years of data <br /> <br />suggest that the median daily flow is less than 600 cfs for 241 days of the year at the Maybell <br /> <br />gage. <br /> <br />Duffy Tunnel model runs have been roughly calibrated to observed models with an <br /> <br />r2=O.912 for depth and r2=0.872 for velocity (Figure 7) and indicate model pr~jections were <br /> <br />very accurate. Calibration correlations are not yet available for IS-Mile reach data, but the <br /> <br />habitat data offered should give reasonable insights into the types of physical habitat <br />40 <br />