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Upper Tuolumne River: Available Data Sources, Field Work Plan, and Initial Hydrology Analysis

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Upper Tuolumne River: Available Data Sources, Field Work Plan, and Initial Hydrology Analysis Upper Tuolumne River: Available Data Sources, Field Work Plan, and Initial Hydrology Analysis water hetch hetchy water & power clean water October 2006 Upper Tuolumne River: Available Data Sources, Field Work Plan, and Initial Hydrology Analysis Final Report Prepared by: RMC Water and Environment and McBain & Trush, Inc. October 2006 Upper Tuolumne River Section 1 Introduction Available Data Sources, Field Work Plan, and Initial Hydrology Analysis Table of Contents Section 1 Introduction .............................................................................................................. 1 Section 2 Hetch Hetchy Facilities in the Study Area ............................................................. 4 Section 3 Preliminary Analysis of the Effects of Hetch Hetchy Project Facilities and Operations on Flow in Study Reaches ..................................................................................... 7 3.1 Analysis Approach ..................................................................................................... 7 3.2 The Natural Hydrograph........................................................................................... 10 3.3 Effects of Flow Regulation on Annual Hydrograph Components ............................. 12 3.3.1 Cherry and Eleanor Creeks.................................................................................................... 14 3.3.2 Tuolumne River...................................................................................................................... 17 3.4 Effects of Flow Regulation on Annual Flood Magnitude and Timing........................ 21 3.4.1 Cherry and Eleanor Creeks.................................................................................................... 21 3.4.2 Tuolumne River...................................................................................................................... 25 3.4.3 Potential Effects of Flow Regulation and Diversion in the Study Reaches............................ 28 Section 4 Available Data and Reports................................................................................... 31 4.1 General Reports and Planning Documents.............................................................. 31 4.1.1 Streamflow Data..................................................................................................................... 32 4.1.2 Geomorphic Data ................................................................................................................... 37 4.1.3 Biologic Data .......................................................................................................................... 38 4.1.4 Vegetation Data...................................................................................................................... 42 4.1.5 Relevant Aerial and Ground Photographs ............................................................................. 43 Section 5 Information Gaps ................................................................................................... 45 5.1 2006 Work Plan........................................................................................................ 45 5.2 Potential Future Tasks ............................................................................................. 47 Section 6 References Cited.................................................................................................... 49 List of Tables Table 3-1: Unimpaired Annual Runoff for the Period of Record and Representative Water Years ....................................................................................................................................9 Table 3-2: Pre-project Streamflow Gages, Elevation, and Hydrograph Components ........11 Table 3-3: Tuolumne River Dams, Drainage Areas, and Reservoir Capacities...................12 Table 3-4: Effect of Cherry Valley Dam on Annual Peak Flood Magnitude .........................22 Table 3-5: Effect of Eleanor Dam on Annual Peak Flood Magnitude ...................................24 Table 3-6: Pre- and Post-dam Annual Flood Peaks in the Hetchy Reach............................27 Table 3-7: Hypotheses of Potential Project Effects on Geomorphic and Ecological Conditions in the Study Reaches ....................................................................................29 Table 4-1: Persons Contacted for Available Reports and Data ............................................31 Table 4-2: General Reports and Planning Documents ..........................................................31 Table 4-3: Streamflow Data and Computed Flow Estimates.................................................34 Table 4-4: Geomorphic Data and Reports ..............................................................................37 Table 4-5: Biologic Data and Reports .....................................................................................38 Table 4-6: Vegetation Data and Reports .................................................................................42 Table 4-7: Aerial Photographs .................................................................................................43 List of Figures Figure 1-1. Tuolumne River Study Reaches............................................................................3 Figure 2-1. Schematic Diagram Showing Reservoirs and Flow Diversions in the Tuolumne River Watershed (source: USGS 2004) ...........................................................5 October 2006 Upper Tuolumne River Section 1 Introduction Available Data Sources, Field Work Plan, and Initial Hydrology Analysis Figure 3-1. Hydrograph Components for a Snowmelt-dominated and Combination Rainfall-snowmelt Flow Regimes similar to the Tuolumne River, Cherry Creek, and Eleanor Creek......................................................................................................................8 Figure 3-2. Tuolumne River Natural Hydrograph (WY1917).................................................11 Figure 3-3. Regulated Tuolumne River Hydrograph WY1999 ..............................................13 Figure 3-4. Unimpaired and Regulated Upper Cherry Reach Hydrograph WY1999 ..........14 Figure 3-5. Unimpaired and Regulated Eleanor Reach Hydrograph WY1999 ....................15 Figure 3-6. Unimpaired and Regulated Lower Cherry Reach Hydrograph WY1999 ..........16 Figure 3-7. Unimpaired and Regulated Holm Reach Hydrograph WY1999 ........................17 Figure 3-8. Unimpaired and Regulated Hetchy Reach Hydrograph WY1999 .....................18 Figures 3-9 a, b and c. Unimpaired and Regulated Hydrograph at Three Locations in the Lumsden Reach WY1999..................................................................................................20 Figure 3-10. Cherry Creek Flood History ...............................................................................21 Figure 3-11. Cherry Creek Flood Frequency .........................................................................22 Figure 3-12. Eleanor Creek Flood History .............................................................................23 Figure 3-13. Cherry Creek Flood Frequency Scaled to Eleanor Creek Drainage Area......24 Figures 3-14 a and b. Tuolumne River Hetchy Reach Flood History ..................................26 Figure 3-15. Tuolumne River Hetchy Reach Flood Frequency............................................27 Figure 4-1. Temperature and Streamflow Data Available for the Study Reaches...............33 Figure 4-2. Biological Data Available for the Study Reaches ...............................................41 Figure 4-3. Aerial Photos and Reach-Specific GIS Data Available for Study Reaches ......44 October 2006 Upper Tuolumne River Section 1 Introduction Available Data Sources, Field Work Plan, and Initial Hydrology Analysis List of Abbreviations ab above CCblDHPH Cherry Creek below Don Holm Powerhouse CCblVD Cherry Creek below Valley Dam CCEI Cherry Creek near Early Intake CDFG California Department of Fish and Game CDT Cherry Diversion Tunnel CDWR California Department of Water Resources cfs cubic feet per second DA drainage area EC Eleanor Creek near Hetch Hetchy ECDT Eleanor-Cherry Diversion Tunnel FERC Federal Energy Regulatory Commission ft feet mi2 square miles MRPB Merced River at Pohono Bridge near Yosemite NPS National Park Service nr near Qe estimated streamflow Qg gaged streamflow RM River Mile S.J. River San Joaquin River Sd reservoir storage SFPUC San Francisco Public Utilities Commission TID Turlock Irrigation District TRblEI Tuolumne River below Early Intake TRBM Tuolumne River near Buck Meadow TRCC Tuolumne River at Cherry Creek confluence TRHH Tuolumne River near Hetch Hetchy TRPT Tuolumne River Preservation Trust USDI U.S. Department of Interior USFS U.S. Forest Service USFS United States Forest Service October 2006 Upper Tuolumne River Section 1 Introduction Available Data Sources, Field Work Plan, and Initial Hydrology Analysis USFWS U.S. Fish and Wildlife Service USGS U.S. Geological Survey WY water year October 2006 Upper Tuolumne River Section 1 Introduction Available Data Sources, Field Work Plan, and Initial Hydrology Analysis Section 1 Introduction The San Francisco Public Utilities Commission (SFPUC) owns and operates the Hetch Hetchy Water and Power system. This system, located in the upper Tuolumne River watershed, includes dams and flow diversions on the Tuolumne River, Cherry Creek (a tributary to the Tuolumne River), and Eleanor Creek (a tributary to Cherry Creek). As part
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