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

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20120723-4002 FERC PDF (Unofficial) 07/23/2012 Implement Alternative 1 Instream Minimum Flows The Alternative 1 minimum flows (as specified in Forest Service condition no. 22) and our recommended minimum flows (table 5-2) are similar to PCWA’s proposed minimum flows, with the exception of the peaking reach minimum flows (generally from 15 to 100 cfs higher than comparable months and water years) and minor differences associated with rounding. Other differences between PCWA’s proposed and our recommended minimum flows include the following: • Our recommended measure specifies that minimum instream flows be released by 5 p.m. on specific dates, while PCWA proposes that minimum instream flows be released within 5 days of the dates specified in a new license. In both cases, exceptions would be allowed when access to the instream flow release infrastructure is restricted by weather or hazardous conditions. • Our recommended measure states that hourly running average flow measurements would never be less than the thresholds specified in a new license, except as authorized in advance. PCWA would maintain instantaneous flows at all times to be no less than 90 percent of the required minimum instream flow and maintain daily average flows to be equal to or above the minimum instream flow and that daily average flows would at all times be no less than 90 percent of the required minimum instream flow. Deviations that are less than 10 percent of the required minimum instream flow would be corrected within 3 days of discovery by releasing the equivalent volume of under-released flow into the affected stream reach. • PCWA proposes that the instream flow releases specified in a new license would be provided within 30 days of license issuance at the locations where existing infrastructure and stream gages can provide and measure new releases. For locations requiring infrastructure modifications and/or new facilities, instream flow releases would be provided and monitored by PCWA within 30 days after completion of the required facility modifications. Our recommended measure specifies a similar schedule where existing infrastructure and stream gages can provide and measure new releases, but also specifies time frames where bypassed reach infrastructure modifications would be complete ranging from year 3 to 5 from license issuance. Until then, we recommend that releases from existing infrastructure would be at the maximum capability of the existing infrastructure if the designated minimum flow is higher than the existing infrastructure could accommodate. 318
319 Table 5-2. Staff-recommended minimum instream flows (cfs) by water year (Source: Forest Service, 2011a, as modified by staff). Location Duncan Creek below Duncan diversion dam Water Year Type a October November December January February March 1-14 March 15-31 April May1-14 May 15-31 June 1-14 June 15-30 July August September 1- 15 September 15- 30 E/C 4 4 4 4 4 4 9 13 13 13 7 7 ND b ND b ND b ND b D 8 8 8 8 8 8 11 14 14 14 7 7 ND b ND b ND b ND b BN 8 8 8 8 8 8 13 17 17 17 9 9 ND b ND b ND b ND b AN 8 8 8 8 8 8 16 24 24 24 12 12 ND b ND b ND b ND b W 8 8 8 8 8 8 16 24 24 24 12 12 ND b ND b ND b ND b E/C 8 8 8 8 8 8 11 11 11 11 8 8 8 8 8 8 Middle Fork American River D 9 9 9 9 9 9 11 13 13 13 11 11 9 9 9 9 below French BN 10 10 10 10 10 10 11 13 13 13 12 12 10 10 10 10 Meadows reservoir dam AN W 11 13 11 13 11 13 11 13 11 13 11 13 15 16 20 20 20 20 20 20 16 17 16 17 11 13 11 13 11 13 11 13 E/C 15 15 15 15 15 15 31 31 23 23 19 15 15 15 15 15 Rubicon River D 20 20 20 20 20 20 35 35 35 35 28 20 20 20 20 20 below Hell Hole BN 20 20 20 20 20 20 42 42 42 42 31 20 20 20 20 20 reservoir dam AN 25 25 25 25 25 25 55 55 55 55 50 40 30 30 30 30 W 25 25 25 25 25 25 60 60 60 60 50 40 30 30 30 30 Middle Fork E/C 12 12 12 12 12 12 16 18 18 18 12 12 12 12 12 12
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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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69 Table 3.3.2-3. Hydrology for sel
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71 Exceedances and Summary Statisti
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91 Figure 3.3.2-6. Fish passage bar
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105 Location American River below M
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135 Species Name Status a Butte Cou
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145 Table 3.3.3-5. Special-status w
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147 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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Page 309 and 310: 279 Enhancement/Mitigation Measures
Page 333 and 334: 303 c Base 2010 costs were provided
Page 337 and 338: 307 Resource No-Action Alternative
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Page 351 and 352: 321 Location Middle Fork American R
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