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

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20120723-4002 FERC PDF (Unofficial) 07/23/2012 Location South Fork Long Canyon Creek below South Fork Long Canyon diversion dam Water Year Type Wet May 13 (May 27) May 16 (May 30) May 1 (May 15) May 2 (May 16) May 11 (May 25) May 13 (May 27) May 16 (May 30) Above Normal 56 Action May 6 Reduce the flow to a minimum of 21 cfs or inflow, whichever is less May 9 Release the minimum instream flow requirement May 1 Release a minimum of 100 cfs or inflow, whichever is less May 2 Close diversion completely May 4 Release a minimum of 70 cfs or inflow, whichever is less (can reopen diversion) May 6 Reduce the flow to a minimum of 35 cfs or inflow, whichever is less May 9 Release the minimum instream flow requirement Table 3.3.1-3. Proposed and Alternative 1 implementation schedule of pulse flows and flow measurement locations. Note: Year 1 begins 30 days after license issuance (Source: PCWA, 2011a, and 2011b, as modified by staff). Project Location Duncan Creek below Duncan diversion dam Middle Fork American River below French Meadows dam Middle Fork American River below Middle Fork interbay dam Rubicon River below Hell Hole reservoir dam Beginning Year following License Issuance Proposed Action Alternative 1 Year 4 Year 4 Year 3 Year 1 Year 3 Year 3 Year 6 Year 6 Measurement Location USGS gage no. 11427750 and a new gage on Duncan Creek diversion tunnel USGS gage no. 11427500 and a new gage at French Meadows dam A new gage in the Middle Fork American River below interbay dam USGS gage no. 11428800 and new gages in the Rubicon River below Hell Hole reservoir dam
20120723-4002 FERC PDF (Unofficial) 07/23/2012 Project Location North Fork Long Canyon Creek below North Fork Long Canyon diversion dam Beginning Year following License Issuance Proposed Action Alternative 1 Year 5 Year 5 South Fork Long Canyon Creek below South Fork Long Canyon diversion dam Year 5 Year 5 Note: USGS – U.S. Geological Survey 57 Measurement Location USGS gage no. 11433080 and a new gage below the North Fork Long Canyon diversion dam USGS gage no. 11433060 and a new gage on South Fork Long Canyon Creek below the diversion dam Alternative 1 includes the same pulse flow measures as those specified in Forest Service condition no. 23 and specifies a schedule of pulse flows for each reach based on water year type, downramping rates of pulse flows, compliance points, test periods, and reporting requirements. Alternative 1 is similar to PCWA’s proposal for pulse flows, except that: • during wet water years, the pulse flow under Alternative 1 would begin on May 15, and PCWA’s proposed pulse flow would begin on May 1; • Alternative 1 includes additional details regarding the time of day to begin pulse flows and testing the ability to release the pulse flows during the first two pulse flow events; and • Alternative 1 specifies that, within 1 year of license issuance, PCWA must develop and implement a feasibility study to identify 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. Our Analysis PCWA’s proposal would increase the number of years that pulse flows would occur in May, when high flow events from rainfall combined with snowmelt often occur, by 71 to 300 percent (11 to 16 years during the period of record) compared with existing conditions (4 to 7 years during the period of record), depending on the reach. This analysis includes the reservoir spill flows and stream flows that exceed diversion capacity in May. The proposed pulse flow events would return some of the moderate flow events that were missing under existing project operations (PCWA, 2011b). In the Middle Fork American River and Rubicon River, the proposed action would maintain a frequency of gravel mobility and scour that historically occurred under existing conditions. The
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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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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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