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FERC 2101 Streamflow and Reservoir Elevation Gaging Plan

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FERC 2101 Streamflow and Reservoir Elevation Gaging Plan Streamflow and Reservoir Elevation Gaging Plan May 2015 Streamflow and Reservoir Elevation Gaging Plan Sacramento Municipal Utility District Hydro License Implementation • May 2015 Upper American River Project FERC Project No. 2101 Sacramento Municipal Utility District Upper American River Project i FERC Project No. 2101 Streamflow and Reservoir Elevation Gaging Plan May 2015 Table of Contents 1.0 Background and Introduction ................................................................................. 1 2.0 Monitoring Plan Objectives ..................................................................................... 2 3.0 Study Area and Gaging Locations .......................................................................... 2 4.0 Methods….. ............................................................................................................... 5 4.1 Streamflow Gaging .................................................................................................... 6 4.1.1 Rubicon River below Rubicon Reservoir Dam ...................................... 7 4.1.2 Little Rubicon River below Buck Island Reservoir Dam ....................... 9 4.1.3 Gerle Creek below Loon Lake Reservoir Dam .................................... 10 4.1.4 Gerle Creek below Gerle Creek Reservoir Dam ................................. 12 4.1.5 South Fork Rubicon River below Robbs Peak Reservoir Dam ........ 13 4.1.6 South Fork Silver Creek below Ice House Reservoir Dam ................ 14 4.1.7 Silver Creek below Junction Reservoir Dam ....................................... 15 4.1.8 Silver Creek below Camino Reservoir Dam ........................................ 16 4.1.9 Brush Creek below Brush Creek Reservoir Dam ................................ 17 4.1.10 SF American River below Slab Creek Reservoir Dam (sufficient to record spills) .................................................................................................................... 18 4.2 Reservoir Elevation Gaging ................................................................................... 21 4.2.1 Loon Lake Reservoir ................................................................................ 22 4.2.2 Ice House Reservoir ................................................................................ 23 4.2.3 Union Valley Reservoir ............................................................................ 24 4.2.4 Rubicon Reservoir .................................................................................... 25 4.2.5 Buck Island Reservoir .............................................................................. 25 4.2.6 Gerle Creek Reservoir ............................................................................. 26 4.2.7 Junction Reservoir ................................................................................... 26 4.2.8 Camino Reservoir..................................................................................... 27 4.2.9 Brush Creek Reservoir ............................................................................ 27 4.2.10 Slab Creek Reservoir ............................................................................ 28 4.3 Recreational Boating Flow Gaging ....................................................................... 28 5.0 Quality Assurance and Quality Control ................................................................ 29 6.0 Analysis….. ............................................................................................................. 32 7.0 Reporting… ............................................................................................................. 32 8.0 Literature Cited ....................................................................................................... 34 Sacramento Municipal Utility District Upper American River Project i FERC Project No. 2101 Streamflow and Reservoir Elevation Gaging Plan May 2015 Table of Tables, Attachments, and Figures Table 1. UARP streamflow gaging site locations and existing parameters. ............ 3 Table 2. UARP Reservoir gaging site locations and existing parameters. ............... 4 Table 3. Additional management streamflow gaging sites ........................................ 5 Table 4. Rubicon River below Rubicon Reservoir Dam ............................................. 9 Table 5. Little Rubicon River below Buck Island Reservoir Dam ............................ 10 Table 6. Gerle Creek below Loon Lake Reservoir Dam ............................................ 11 Table 7. Gerle Creek below Gerle Creek Reservoir Dam ......................................... 12 Table 8. South Fork Rubicon River below Robbs Peak Reservoir Dam ................. 13 Table 9. South Fork Silver Creek below Ice House Reservoir Dam ........................ 15 Table 10. Silver Creek below Junction Reservoir Dam ............................................ 16 Table 11. Silver Creek below Camino Reservoir Dam .............................................. 17 Table 12. Brush Creek below Brush Creek Reservoir Dam ..................................... 18 Table 13. South Fork American River below Slab Creek Reservoir Dam ............... 20 Table 14. South Fork American River below Slab Creek Reservoir Dam ............... 21 Table 15. General Information on Project Reservoirs .............................................. 22 Table 16. Loon Lake Reservoir Level by Water Year ................................................ 23 Table 17. Ice House Reservoir Level by Water Year ................................................. 24 Table 18. Union Valley Reservoir Level by Water Year ............................................ 24 Table 19. UARP Recreational Staff Gages ................................................................ 29 Table 20. Specifications for the various monitoring equipment. ............................ 30 Table 21. Summary of UARP Gaging Station Improvements .................................. 31 ATTACHMENT 1. ......................................................................................................... 35 Figure 1. Streamflow Gaging Locations…………………………….……………………42 Figure 2. Reservoir Gaging Locations……………………………………………………43 Sacramento Municipal Utility District Upper American River Project ii FERC Project No. 2101 Streamflow and Reservoir Elevation Gaging Plan May 2015 1.0 Background and Introduction This Streamflow and Reservoir Elevation Gaging Plan (Gaging Plan or Plan) was prepared by the Sacramento Municipal Utility District (SMUD) in response to the State Water Resources Control Board (SWRCB) 401 Water Quality Certification Condition 6 (SWRCB 2014) and Condition 36 of the United States Forest Service (USFS) 4(e) as described in the FERC Order Issuing New License (License or new License) of July 23rd, 2014 for the Upper American River Project (UARP), FERC Project No. 2101(FERC 2014). Attachment 1 consists of the conditions contained in the various documents which are applicable to this monitoring plan. The UARP lies within El Dorado and Sacramento counties, primarily within lands of the Eldorado National Forest. The UARP consists of three major storage reservoirs—Loon Lake, Union Valley and Ice House (with a combined capacity of 379,622 acre-feet), eight smaller regulating or diversion reservoirs, and eight powerhouses. The UARP began operations in 1961 and has a generating capacity of approximately 688 megawatts. The UARP also includes recreation facilities containing over 700 campsites, five boat ramps, and hiking and bicycling trails at the reservoirs. SMUD owns and maintains the various dams of the UARP. The original designs of the outlet works and the gaging sites for these dams were engineered for the streamflows that SMUD released pursuant to the original License issued by FERC in 1957. The new License requires SMUD to increase the minimum streamflow releases at all the UARP dams. It also requires SMUD to make special releases at certain dams for stream channel maintenance (referred to as pulse flows), whitewater boating, and water temperature control. Ramping rates are also required during periods when SMUD increases and decreases releases for boating and pulse flow purposes. SMUD will monitor the volume of releases from these dams to assure compliance with release requirements contained in the License. This will require SMUD to modify the outlet works and/or gaging facilities at certain dams. Additionally, as part of the License, SMUD is required to maintain minimum water surface elevations at some UARP reservoirs (SWRCB 401 Water Quality Certification Condition 5, SWRCB 2014). This Gaging Plan describes SMUD’s existing gaging facilities and the proposed modifications necessary to demonstrate compliance with all reservoir release aspects of the License. In keeping with License requirements, SMUD is releasing this Plan with the objective of achieving United States Geological Survey (USGS) and State Water Resources Control Board (SWRCB) review and approval, followed by FERC approval, within one year of License issuance. However, the License also allows up to 3 years after License issuance for SMUD to complete needed facility modifications. Sacramento Municipal Utility District Upper American River Project 1 FERC Project No. 2101 Streamflow and Reservoir Elevation Gaging Plan May 2015 2.0 Monitoring Plan Objectives The primary objective and rationale for the streamflow and reservoir elevation gaging program is to ensure compliance with Settlement Agreement Articles 1-1: Minimum Streamflows and 1-23: Reservoir
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