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Title: Colorado squawfish spawning (staging) velocity curve. <br />Parameters: Mean column velocity (cfs) <br />Period: 1 July - 31 August <br />Location: Yampa River RM 4-31. <br />Data Utilized: <br />Modeled range of mean water column velocities at RM 16.4 <br />(Cleopatra's Couch) in deep pool/eddie reach occupied by <br />Colorado squawfish during spawning period. The 50$ fre- <br />quency range for the observed range of discharges 1980- <br />1984 is defined as optimum for spawning (staging) <br />Data excluded: <br />All mean water column velocity measurements collected at <br />capture sites and during radio tracking because those <br />measurements represent microhabitats that are not accurately <br />modeled by the hydraulic model for this reach.. <br />Assumptions: <br />1. The range of mean column velocities, that the model <br />indicates existed across the range of discharges be- <br />tween 1980-1984 when Colorado squawfish were congre- <br />gated in the reach, represents the range of optimum <br />velocities for Colorado squawfish spawning (staging). <br />2. Optimum velocities were present during all years of <br />observation 1980-1984 for spawning (staging). <br />3. Modeled velocities accurately represent true velocities. <br />Constraints: <br />1. Curve is applicable to only the modeled spawning reach <br />at RM 16.4 on the Yampa River. <br />Curve coordinates: <br />X (ft/sec) Y (SI) <br />0.05 0.0 <br />0.5 0.75 <br />1.2 1.0 <br />2.6 1.0 <br />4.0 0.0 <br />... -8- <br />