Folsom TCD Value Planning Study July Tom Gohring September 9, 2014

Transcription

1 Folsom TCD Value Planning Study July 2014 Tom Gohring September 9, 2014

2 Steelhead in Danger An average of 154 redds have been counted each year since 2003 on the American River. NOAA Fisheries, 2011 Less than 250

3 Fall Run Chinook in Danger ~ 2500 in 2008

4 x 76 o F 74 Gradation of Effect Incipient lethal High frequency of rosy anus Pathogens become virulent Decreased foraging Elevated heat shock Higher bacterial mortality

5 Problem Water Too Warm

6

7 Value Planning Study Participants Dan Artho US Army Corps of Engineers, Sacramento, CA Merlynn D. Bender Reclamation, TSC, Denver, CO Paul Bratovich SAFCA(HDR), Folsom, CA Donna Garcia and Elizabeth Kiteck Reclamation Central Valley Ops Tom Gohring Sacramento Water Forum Chris Hammersmark and Rusty Barker, cbec, Sacramento, CA Ed Meyer NOAA Fisheries, Portland, OR Traci Michel Reclamation, Bay Delta Office, Sacramento, CA Greg O Haver EID(HDR), Cottonwood, CA Bonnie Van Pelt Reclamation, Central California Area Office Garwin Yip NOAA Fisheries, Sacramento, CA Jay Bytheway Reclamation, UC Region, Salt Lake City, UT Tom Cook Thomas Cook Innovation LLC, Conifer, CO

8 Folsom Dam Reduce Shutter Leakage Provide Flexible Withdrawal Above Penstocks Withdraw Cold Water Below Penstocks Existing Power Plant

9 Background NMFS 2009 BiOp Reasonable & Prudent Alternative (RPA): Folsom Dam temperature control device Cold water transport through Lake Natoma El Dorado Irrigation District Temperature Control Device (EID TCD) Temperature Management Decision Support Tools

10 Alternatives Considered Reduce Shutter Leakage 1 Leakage Reduction Withdraw Cold Water Below Penstocks 2A Vertical Coldwater Access Conduit 500 cfs 2B Vertical Coldwater Access Conduit 2,000 cfs 3 Power Bypass Monetary Fund 4A Shunt to Folsom Power Plant 4B Conduit through Dam & 15 MW Power plant Provide Flexible Withdrawal Above Penstocks 5A Mechanized Shutter Modifications* 5B ACOE 35% Design Install New Mechanized* 6 El Dorado Irrigation District Intake Curtain *Does not include leakage reduction (Alternative No.1)

11 Results Category Highest Possible Score Score Leakage Reduct'n 306 2A Elephant 500 cfs 162 2B Access Cold Trunk 2000 cfs Water Below Power Bypass Penstocks Shunt to PP 260 4A New Small PP 252 5A Old Guides 201 Shutters 5B Telescoping 191 6A Fixed 3 Level 90 EID TCD 6B Curtain 167

12 Alt 1: Leakage Reduction Seal around shutter Seal next to dam Common feature

13 Leakage Reduction common feature Could be done on existing shutters SHOULD be done on any shutter project (Alts 5A or 5B)

14 Alt 2: Vertical Coldwater Access Conduit

15 Underwater construction is expensive & complex Won t work unless leakage reduced to very LOW level Can produce power while accessing deep coldwater pool Alt 2: Vertical Coldwater Access Conduit Alt 2A. 500 cfs Hangs from Dam Connects to 1 TCD Unit Alt 2B. 2,000 cfs Hangs from Dam Connects to 2 or 3 TCD Units Much bigger More Benefit.. and COST!

16 3. Power Bypass Fund Planned releases through lower outlets, bypassing the power plant flows. Cost of foregone power funded through a revolving fund $ More flexible than current power bypass Strive to release all 50 TAF of lower water every year Folsom Dam

17 4A. Shunt to Folsom Power Plant

18 4A. Shunt to Folsom Power Plant Install new intake adjacent to existing penstock Same elevation (238 feet msl) at top of remnant coffer dam Tie in to existing penstock pipe between Folsom Dam and power plant Can produce power while accessing deep coldwater pool

19 4B: Conduit thru Dam with New Powerplant Install 10 ft. dia intake Connected to dedicated 15 MW powerplant At same elevation as old coffer dam Folsom Dam with Proposed 15 MW Power Plant TCD Shutters El Can produce power while accessing deep coldwater pool New Intake ~10 DIAMETER Existing Power Plant New 15 MW Power Plant

20 5A: Mechanized Shutter Modifications De gang existing shutters Use existing shutter guides Use new hook system to raise each shutter individually

21 5A: Mechanized Shutter Modifications Retains present shutters and guides Mechanized: changes in minutes Provides 26 foot high opening At 13 foot increments Each shutter connected to lifting mechanism All shutters & mechanisms could be removed for maintenance: no divers Leakage Reduction not included Flexibly select withdrawal elevation Trash rack still inside shutters

22 5B: USACE 35% Design New Mechanized TCD Replace existing shutters with a 5 shutter configuration. Each shutter would travel on individual tracks Shutters would be raised/lowered via a hoist mechanism at top of TCD Leakage Reduction not included

23 5B: USACE 35% Design New Mechanized TCD Existing Stacking Shutters

24 5B: USACE 35% Design New Mechanized TCD Proposed Telescoping Shutters

25 5B: USACE 35% Design New Mechanized TCD

26 5B: USACE 35% Design New Mechanized TCD Flexibly select withdrawal elevation Trash rack protects shutters Replace existing shutters with a 5 shutter configuration. Each shutter would travel on individual tracks Shutters would be raised/lowered via a hoist mechanism at top of TCD Leakage Reduction not included

27 6: EID Intake Curtain Excludes withdrawal of colder water EID Folsom Lake Pumps Uses reinforced hypalon curtain Leaves cold water pool in lake for LAR temperature management

28 Evaluation Matrix Quantified Evaluation Method Biological Benefit 49% Modeled Project Costs 27% Design & Construction 13% Subjective Operations and Maintenance 11%

29 Quantification: Biological Benefits Degree Days Above Suitable Steelhead 65 F, May 1 October 30 Fall run Chinook salmon 56 F, October 15 December 31 Fall run Chinook Salmon Early Life Stage Mortality Model % Mortality of Run Simulated with icpmm for the

30 Modelled Bio Metric: Degree Days Above Suitable (DDAS) Each Alternative gets us lower temps. Even with all categories still have red

31 Change in # of DDAS Better Significant Benefit

32 Change in # of DDAS Better Significant Benefit

33 Change in Mortality Better Significant Benefit

34 Evaluation Matrix: Summary Category Highest Possible Score 1. Leakage Reduct'n Access Cold Water Below Penstocks Elephant Trunk 3. 2A. 500 cfs 2B cfs Power Bypass Fund 4. Shunt to PP 4A. New PP Shutters 5A. Old Guides 5B. Telesco ping EID TCD 6A. Fixed 3 Level 6B. Curtain Bio. Benefit Project Cost Design & Const O & M Total

35 High nefit High Benefit Low Benefit Low nefit Degree Days (May Oct) 0 High Cost 4A. New PP 2B. ET 2000 High Cost Costs & Benefits 4. Shunt 2A. ET 500 6A. 3 Level EID 3. Bypass Fund 5B. ACE TCD 5A. TCD Mod 6B. Curtain EID $40M $10M Low Cost 1. Leakage Capital Cost x Low Cost Low Cost

36 Results Category Score Highest Possible Score 400? 1 Leakage Reduct'n 306 5A Old Guides 201 Shutters 5B Telescoping 191 2A Elephant 500 cfs 162 2B Access Cold Trunk 2000 cfs Water Below Power Bypass Penstocks Shunt to PP 260 4A New Small PP 252 6A Fixed 3 Level 90 EID TCD 6B Curtain 167

37 Next Steps Choose optimal mix of Alternatives Project sponsors need to identify alternatives that should move forward Conduct appraisal level design, detailed cost estimation, and further analysis Final decisions Parallel process: Cold water transport thru Lake Natoma Temp. Management Decision Support Tools.