Whitewater Boating Flow Study for Slab Creek Reach Technical Report
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SACRAMENTO MUNICIPAL UTILITY DISTRICT UPPER AMERICAN RIVER PROJECT (FERC NO. 2101) WHITEWATER BOATING FLOW STUDY FOR SLAB CREEK REACH TECHNICAL REPORT Prepared by: Devine Tarbell & Associates, Inc. The Louis Berger Group Sacramento, California Oakhurst, California Prepared for: Sacramento Municipal Utility District Sacramento, California OCTOBER 2004 Sacramento Municipal Utility District Upper American River Project FERC Project No. 2101 TABLE OF CONTENTS Section & Description Page 1.0 INTRODUCTION .............................................................................................................. 2 2.0 BACKGROUND ................................................................................................................ 3 2.1 Whitewater Boating Flow Study Plan for Slab Creek Reach ................................. 3 2.1.1 Whitewater Boating Flow Ecological Study Plan for Slab Creek Reach ... 4 2.2 Water Year Types................................................................................................... 5 2.3 Recreation TWG Determination of Adequacy ..................................................... 10 3.0 METHODS ....................................................................................................................... 10 3.1 Target Flows and Schedule................................................................................... 11 3.2 Boating Participants.............................................................................................. 11 3.3 Project Operations During the Study .................................................................... 11 3.4 Data Collection..................................................................................................... 13 3.5 Ecological Studies................................................................................................. 14 4.0 RESULTS ......................................................................................................................... 14 4.1 Study Participants................................................................................................. 14 4.2 Timetable on Test Flow Days............................................................................... 15 4.3 Reach Description................................................................................................. 16 4.4 Boater Evaluations................................................................................................ 16 4.4.1 Boatability................................................................................................. 17 4.4.2 Access ....................................................................................................... 18 4.4.3 Reach Characteristics................................................................................ 23 4.4.4 Acceptable Flows for Boating .................................................................. 25 4.4.5 Range of Optimum Flows......................................................................... 28 4.4.6 Comparison to Other Runs in California .................................................. 30 4.4.7 Nearby Population Centers ....................................................................... 30 4.4.8 Whitewater Boating Opportunities in the American River Watershed .... 31 4.5 Hydrology ............................................................................................................. 32 4.6 Videotape .............................................................................................................. 33 4.7 Ecological Studies................................................................................................. 33 5.0 ANALYSIS....................................................................................................................... 33 5.1 Minimum Acceptable Flows................................................................................. 33 5.2 Optimal Range of Flows ....................................................................................... 35 5.3 Hydrology Analysis.............................................................................................. 35 5.4 Commercial Use....................................................................................................39 UARP License Application Whitewater Boating Flow Study For Slab Creek Reach Technical Report 10/11/2004 Copyright © 2004 Sacramento Municipal Utility District Page TOC i Sacramento Municipal Utility District Upper American River Project FERC Project No. 2101 TABLE OF CONTENTS Section & Description Page 5.5 Carrying Capacity................................................................................................. 39 6.0 FINDINGS........................................................................................................................ 40 7.0 LITERATURE CITED..................................................................................................... 42 Whitewater Boating Flow Study For Slab Creek Reach Technical Report UARP License Application 10/11/2004 Page TOC ii Copyright © 2004 Sacramento Municipal Utility District Sacramento Municipal Utility District Upper American River Project FERC Project No. 2101 LIST OF TABLES Table No. & Description Page Table 2.2-1. Application of UARP Relicensing Plenary Group water year types for the period from Calendar Year 1975 through 2001. ...........................................9 Table 2.3-1. Response to Recreation TWG comments on Whitewater Boating Flow Study for Slab Creek Reach Technical Report dated February 2004. ..............10 Table 4.2-1. Test flow timetable of events, Oct. 31, Nov. 1-2, 2003 ....................................15 Table 4.4-1. Distance and driving time to Slab Creek Reach from nearby population centers. ..............................................................................................................30 Table 4.4-2. Whitewater boating opportunities in the American River watershed. ..............31 UARP License Application Whitewater Boating Flow Study For Slab Creek Reach Technical Report 10/11/2004 Copyright © 2004 Sacramento Municipal Utility District Page TOC iii Sacramento Municipal Utility District Upper American River Project FERC Project No. 2101 LIST OF FIGURES Figures No. & Description Page Figure 2.1-1 Whitewater Boating Flow Study for Slab Creek Reach......................................7 Figure 3.3-1 Slab Creek Dam Spilling during flow study. ....................................................12 Figure 4.1-1 Study Participants on the Slab Creek Reach.....................................................15 Figure 4.4-1. Turnaround area at end of Slab Creek Adit Access Road.................................19 Figure 4.4-2. Mosquito Road Bridge crossing of the SFAR. .................................................20 Figure 4.4-3. Parking area at White Rock Powerhouse..........................................................21 Figure 4.4-4. Parking area at Rock Creek Powerhouse. .........................................................22 Figure 4.4-5. Parking area at the SFAR Access Road from the Rock Creek Road................23 Figure 4.4-6. Boater responses (averaged) regarding the whitewater characteristics of the Slab Creek Run at 616 cfs. Note: the responses for the raft category are from respondents who boated the reach in a 2-person raft (11’). (Source: Data from the Single Flow Evaluation Form at 616 cfs.)...................24 Figure 4.4-7. Boater responses (averaged) regarding the whitewater characteristics of the Slab Creek Run at 1,068 cfs. (Source: Data from the Single Flow Evaluation Form at 1,068 cfs.)..........................................................................24 Figure 4.4-8. Boater responses (averaged) regarding the whitewater characteristics of the Slab Creek Run at 1,597 cfs. (Source: Data from the Single Flow Evaluation Form at 1,597 cfs.)..........................................................................25 Figure 4.4-9. Average Boater Acceptability of Flow-Kayakers. (Scale: 1=Totally Unacceptable, 2=Unacceptable, 3=Marginal, 4=Acceptable, 5=Totally Acceptable) (Source: Data from the Comparative Evaluation Form)...............26 Figure 4.4-10. Average Boater Acceptability of Flow-Rafters. (Scale: 1=Totally Unacceptable, 2=Unacceptable, 3=Marginal, 4=Acceptable, 5=Totally Acceptable) (Source: Data from the Comparative Evaluation Form)...............26 Figure 4.4-11. Average Boater Acceptability of Flow-Overall. (Scale: 1=Totally Unacceptable, 2=Unacceptable, 3=Marginal, 4=Acceptable, 5=Totally Acceptable) (Source: Data from the Comparative Evaluation Form)...............27 UARP License Application Whitewater Boating Flow Study For Slab Creek Reach Technical Report 10/11/2004 Copyright © 2004 Sacramento Municipal Utility District Page TOC v Sacramento Municipal Utility District Upper American River Project FERC Project No. 2101 LIST OF FIGURES Figures No. & Description Page Figure 4.4-12. Average Boater Acceptability of Flow-Comparison by Craft. (Scale: 1=Totally Unacceptable, 2=Unacceptable, 3=Marginal, 4=Acceptable, 5=Totally Acceptable) (Source: Data from the Comparative Evaluation Form).........................................................................27 Figure 4.4-13. Average optimal range of flows presented for all craft and sorted by type of craft. (Source: Data from the Comparative Evaluation Form) ....................28 Figure 4.4-14. Average optimal range of flows presented for all craft and sorted by skill level.