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

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20120723-4002 FERC PDF (Unofficial) 07/23/2012 PCWA proposes new pulse flows that would affect channel morphology and bed surface textures in the bypassed. The pulse flows are designed to initiate gravel mobility, scour the channel bed, and facilitate cottonwood and willow regeneration in the bypassed reaches during wet and above normal water year types (PCWA, 2007b). Table 3.3.1-2 summarizes the schedule of pulse flow releases by water year type and reach. No pulse flows are proposed in the Middle Fork American River downstream of Ralston afterbay dam and in the peaking reach because natural high-flow events from unregulated river inflows (e.g., North Fork of Middle Fork American River and North Fork American River) and accretion in the reach provide the same functions as managed pulse flows in these two reaches. The timing of pulse flow implementation following issuance of a new license and the compliance points for measuring pulse flows (table 3.3.1-3) are outlined in PCWA’s proposed Flow and Reservoir Monitoring Plan (discussed in detail in section 3.3.2.2, Aquatic Resources). PCWA also proposes to develop and implement a feasibility study within one year of license issuance that identifies the maximum pulse flow between 200 and 600 cfs that can safely and reliably be released from the existing low-level outlet at Hell Hole dam. Table 3.3.1-2. Proposed and Alternative 1 (in parentheses when different from proposed) pulse flow schedule for wet and above normal water years (Source: PCWA, 2011a, and 2011b, as modified by staff). Water Year Type Above Location Wet Normal Action May 1 Release a minimum of 150 cfs or inflow, whichever May 7 (May 15) is less May 2 May 8 Close diversion completely (May 16) Duncan Creek below Duncan diversion dam May 11 (May 25) May 13 (May 27) May 16 (May 30) May 19 (June 2) May 23 (June 6) Release a minimum of 190 cfs or inflow, whichever May 10 is less (can reopen diversion) Reduce the flow to a minimum of 130 cfs or inflow, May 12 whichever is less Reduce the flow to a minimum of 90 cfs or inflow, May 15 whichever is less Reduce the flow to a minimum of 45 cfs or inflow, May 18 whichever is less May 22 Release the minimum instream flow requirement 54
20120723-4002 FERC PDF (Unofficial) 07/23/2012 Location Middle Fork American River below French Meadows reservoir dam Rubicon River below Hell Hole reservoir dam Middle Fork American River below Middle Fork interbay dam North Fork Long Canyon Creek below North Fork Long Canyon diversion dam Water Year Type Wet May 1 (May 15) May 2 (May 16) May 10 (May 24) May 12 (May 26) May 15 (May 29) May 18 (June 1) May 22 (June 5) May 1 (May 15) June 7 (June 21) June 9 (June 23) June 12 (June 26) May 1 (May 15) May 2 (May 16) May 10 (May 24) May 12 (May 26) May 15 (May 29) May 18 (June 1) May 1 (May 15) May 2 (May 16) May 11 (May 25) Above Normal May 7 Action Increase flows from the minimum instream flow release to a minimum of 200 cfs May 8 Increase flows to a minimum of 400 cfs May 10 Reduce the flow to a minimum of 275 cfs May 12 Reduce the flow to a minimum of 190 cfs May 15 Reduce the flow to a minimum of 115 cfs May 18 Reduce the flow to a minimum of 65 cfs May 22 Release the minimum instream flow requirement May 1 Increase flows from the minimum instream flow release to a minimum of 200 cfs May 16 Reduce the flow to a minimum of 150 cfs May 18 Reduce the flow to a minimum of 90 cfs May 21 Release the minimum instream flow requirement May 7 Increase flows from the minimum instream flow release to a minimum of 200 cfs May 8 Increase flows to a minimum of 450 cfs May 10 Reduce the flow to a minimum of 360 cfs May 12 Reduce the flow to a minimum of 260 cfs May 15 Reduce the flow to a minimum of 155cfs May 18 Release the minimum instream flow requirement May 1 Release a minimum of 50 cfs or inflow, whichever is less May 2 Close diversion completely May 4 Release a minimum of 35 cfs or inflow, whichever is less (can reopen diversion) 55
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Page 71 and 72: 41 Table 3.3.1-1. Average number of
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Page 99 and 100: 69 Table 3.3.2-3. Hydrology for sel
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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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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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