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Figure 4. Tailspill and redd depth relationships for Yuba River steelhead/rainbow trout redds. area downstream of Daguerre Point Dam would be 250,049 ft 2 12 (23,230 m 2 ). In contrast, if the Yuba River flow downstream of Daguerre Point Dam drops from 1,900 to 1,200 cfs, the stranding area downstream of Daguerre Point Dam would be 6,078 ft 2 (565 m 2 ). The relationship of flow drops to redd dewatering are shown in Figures 7 to 12 and Appendix D. The definition of the dewatering and stranding flows shown in Figures 5 to 12 and Appendices C and D is the flow after the flow decrease has occurred. Table 10 shows the juvenile stranding and redd dewatering results for three example flow decreases: 2,900 to 2,000 cfs, 2,000 to 1,000 cfs and 2,900 to 1,000 cfs. 12 250,049 ft 2 (23,230 m 2 ) is the total area of the stranding sites (site 57) that strand between 1,200 and 1,100 cfs. USFWS, SFWO, Energy Planning and Instream Flow Branch Yuba River Redd Dewatering and Juvenile Stranding Report September 15, 2010 15
Table 9. Redd dewatering Habitat Suitability Criteria for the Lower Yuba River. Binary Suitability Index (SI) have values of either 0 or 1. Water Water Channel Velocity (ft/s) SI Value Depth (ft) SI Value Index Value SI Value USFWS, SFWO, Energy Planning and Instream Flow Branch Yuba River Redd Dewatering and Juvenile Stranding Report September 15, 2010 Spring-run Chinook Salmon 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.00 0.50 0.00 1.00 1.00 0.29 1.00 0.52 1.00 100.0 1.00 100.0 1.00 100.0 1.00 Fall-run Chinook Salmon 0.00 0.00 0.00 0.00 0.00 0.00 0.22 0.00 0.50 0.00 1.00 1.00 0.23 1.00 0.52 1.00 100.0 1.00 100.0 1.00 100.0 1.00 Steelhead/rainbow trout 0.00 0.00 0.00 0.00 0.00 0.00 0.08 0.00 0.20 0.00 1.00 1.00 0.09 1.00 0.23 1.00 100.0 1.00 100.0 1.00 100.0 1.00 DISCUSSION Hydraulic Model Construction and Calibration The modification of IFG4 discussed in the methods where we only used two calibration flows is not usually considered acceptable for developing stage-discharge relationships. However, we believe that it is sufficiently accurate for interpolating a stranding flow in between two calibration flows in our study because errors in stage-discharge relationships are typically large only for extrapolation outside of the range of calibration flows. IFG4 could not be used for sites located within the backwater effects of the Feather River because a basic assumption of IFG4 is that the WSEL only varies as a function of the discharge at the stage-discharge relationship location. 16
Page 1 and 2: RELATIONSHIPS BETWEEN FLOW FLUCTUAT
Page 3 and 4: ACKNOWLEDGMENTS Field work for this
Page 5 and 6: TABLE OF CONTENTS (CONTINUED) DISCU
Page 7 and 8: LIST OF TABLES TABLE 1 Study tasks
Page 9 and 10: Table 1. Study tasks and associated
Page 11 and 12: Figure 1. Yuba River stream segment
Page 13 and 14: Hydraulic and Structural Data Colle
Page 15 and 16: were those which bracketed the stra
Page 17 and 18: Water surface elevations were measu
Page 19 and 20: Table 7. Calibration flows for stra
Page 21: Figure 2. Tailspill and redd depth
Page 25 and 26: Figure 6. Stranding areas of juveni
Page 27 and 28: Figure 8. Predicted dewatering of f
Page 29 and 30: Figure 10. Predicted dewatering of
Page 31 and 32: Figure 12. Predicted dewatering of
Page 33 and 34: Habitat Suitability Criteria (HSC)
Page 35 and 36: Figure 13. Yuba River flows below D
Page 37 and 38: APPENDIX A STRANDING SITE LOCATIONS
Page 39 and 40: Stranding Site # MHU # USFWS, SFWO,
Page 41 and 42: USFWS, SFWO, Energy Planning and In
Page 43 and 44: BETA %MEAN Calculated vs. Given Dis
Page 49 and 50: Stranding flow (cfs) USFWS, SFWO, E
Page 51 and 52: Stranding flow (cfs) USFWS, SFWO, E
Page 53 and 54: USFWS, SFWO, Energy Planning and In
Page 55 and 56: Dewatering flow (cfs) USFWS, SFWO,
Page 59 and 60: Dewatering flow (cfs) Percentage of
Page 61 and 62: Dewatering flow (cfs) Percentage of
Page 67: LIST OF ACRONYMS 2-D Two dimensiona

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