Draft EIS_072312.pdf - Middle Fork American River Project ...

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20120723-4002 FERC PDF (Unofficial) 07/23/2012 Table 3.3.2-9. Proposed and Alternative 1 downramping rates proposed following spills from Hell Hole reservoir dam into Rubicon River and from French Meadows reservoir dam into Middle Fork American River (Source: PCWA, 2011a, and 2011b, as modified by staff). Location Schedule Action Rubicon River below Hell Hole reservoir dam Middle Fork American River below French Meadows reservoir dam First 600-cfs spill event Day 1 Release a minimum of 600 cfs Day 5 Reduce the flow to a minimum of 400 cfs Day 7 Reduce the flow to a minimum of 285 cfs Day 9 Reduce the flow to a minimum of 170 cfs Day 13 Reduce the flow to a minimum of 95 cfs Day 17 Release the minimum instream flow requirement Subsequent 600-cfs spill events (if they occur) Day 1 Reduce the flow to a minimum of 400 cfs Day 3 Reduce the flow to a minimum of 285 cfs Day 6 Reduce the flow to a minimum of 170 cfs Day 10 Reduce the flow to a minimum of 95 cfs Day 14 Release the minimum instream flow requirement Day 1 Release a minimum of 400 cfs Day 5 Reduce the flow to a minimum of 275 cfs Day 7 Reduce the flow to a minimum of 190 cfs Day 9 Reduce the flow to a minimum of 115 cfs Day 13 Reduce the flow to a minimum of 65 cfs Day 17 Release the minimum instream flow requirement 110
20120723-4002 FERC PDF (Unofficial) 07/23/2012 Table 3.3.2-10. Proposed and Alternative 1 up- and downramping rates proposed for March through October at Oxbow powerhouse. Ramping rates would be based on the flow present in the Middle Fork American River near USGS Gage No. 11433300 (Source: PCWA 2011a and 2011b, as modified by staff). Gage Flow (cfs) Upramping Downramping Maximum Flow Change (cfs/hour) Gage Flow (cfs) 111 Maximum Flow Change (cfs/hour) 500–800 400 >400–750 600 >800–1,300 550 >750 750 >1,300 750 PCWA proposes ramping rates in the peaking reach as specified in table 3.3.2-10. Compliance in years 1 and 2 after license issuance would be based on flow measured in the Middle Fork American River near Foresthill (USGS gage no. 11433300). In year 3 after license issuance or as soon as the new Oxbow powerhouse penstock gage is operational, ramping rates would be measured at the new Oxbow powerhouse penstock gage and the Middle Fork American River near Foresthill (USGS gage no. 11433300). During the months of November through February, PCWA would make a good faith effort to regulate Oxbow powerhouse flow releases in the peaking reach. This would include, to the degree possible, scheduling Oxbow powerhouse generation to moderate peaking in the Middle Fork American River using available active Ralston afterbay storage. PCWA also proposes to impose a 900 cfs upper limit on Oxbow powerhouse releases in the summer of drier water years. Alternative 1 includes the ramping rates specified in Forest Service condition no. 24. Alternative 1 is similar to PCWA’s proposal for ramping, except for an additional clause indicating that during the first two events when down ramp of spill flows occur at Hell Hole and French Meadow reservoirs, PCWA would test its ability to manage spill flow to provide the specified ramping rates. Deviations from the criteria during these tests would not be considered violations but would be reported to the Forest Service California Fish and Game, and the Water Board within 30 days of the occurrence. After each spill event, a testing report would be submitted to the Forest Service, California Fish and Game, and the Water Board, with any recommendations for a modified downramping rate. After agency approval of any modified ramping rate, PCWA would submit the modified downramping schedule to the Commission.
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41 Table 3.3.1-1. Average number of
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43 Site/Release Location Gravel Ini
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45 a Q 1 - TSR, Table G-1 (PCWA, 20
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161 Species Name Status Habitat Occ
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195 Figure 3.3.5-1. French Meadows
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197 Figure 3.3.5-3. Long Canyon, re
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253 Table 3.3.6-1. Archaeological a
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255 Resource Number Type a Descript
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275 Table 4-2. Summary of annual co
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279 Enhancement/Mitigation Measures
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303 c Base 2010 costs were provided
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307 Resource No-Action Alternative
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319 Table 5-2. Staff-recommended mi
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321 Location Middle Fork American R
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