1 potential project betterments to be studied further during relicensing june 20, 2006 stakeholder...
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Potential Project Betterments Potential Project Betterments to be studied further during Relicensingto be studied further during Relicensing
June 20, 2006June 20, 2006
Stakeholder MeetingStakeholder Meeting
Middle Fork American RiverMiddle Fork American River Hydroelectric Project Relicensing Hydroelectric Project Relicensing
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OutlineOutlineOutlineOutline
Resource Utilization Study Resource Utilization Study BettermentsBetterments Study ProcessStudy Process Inventory and Screening of Inventory and Screening of
BettermentsBetterments Betterments to be studied further in Betterments to be studied further in
relicensingrelicensing
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Resource Utilization Study (RUS)Resource Utilization Study (RUS)Resource Utilization Study (RUS)Resource Utilization Study (RUS)
RUS is required by the Federal Energy RUS is required by the Federal Energy Regulatory Commission in relicensingRegulatory Commission in relicensing Demonstrate that PCWA’s proposal to Demonstrate that PCWA’s proposal to
manage, operate and maintain the project manage, operate and maintain the project is best adapted to serve the public is best adapted to serve the public interest.interest.
Develop information required to be Develop information required to be submitted in license exhibits.submitted in license exhibits.
Opportunity for PCWA to improve Opportunity for PCWA to improve project in light of current or future project in light of current or future public needs.public needs. Betterments Betterments
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BettermentsBettermentsBettermentsBetterments Better meet the primary purposes for Better meet the primary purposes for
which the project was developed.which the project was developed. Water supplyWater supply Hydroelectric power generationHydroelectric power generation
HowHow Increase resource utilizationIncrease resource utilization Improve system reliabilityImprove system reliability Improve operations and maintenance Improve operations and maintenance
efficiencyefficiency Other Other enhancementsenhancements addressed in project addressed in project
mitigation and enhancement (PM&E) mitigation and enhancement (PM&E) studies.studies.
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RUS ProcessRUS ProcessRUS ProcessRUS Process
Betterments to carry forward in relicensing.
Project DescriptionJune 2006
Technical/environmental studies and
agency/public consultation 2007-2010
Include viable projects in
License Application
Initial data collection evaluation & screening
Inventory of potential betterments
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RUS ProcessRUS ProcessRUS ProcessRUS Process Identify existing resource utilization baselineIdentify existing resource utilization baseline
Initial brainstorming, & discussions with PCWA Initial brainstorming, & discussions with PCWA Management and Staff identified potential Management and Staff identified potential betterments.betterments.
Field visits and discussions with operations staff Field visits and discussions with operations staff added more betterments and resulted in some added more betterments and resulted in some being dropped.being dropped.
Preliminary technical analysis and evaluation of Preliminary technical analysis and evaluation of potential feasibility of betterments.potential feasibility of betterments.
Workshops with PCWA to discuss betterments and Workshops with PCWA to discuss betterments and make planning decisions regarding:make planning decisions regarding: Betterments to study further in relicensingBetterments to study further in relicensing Betterments to discardBetterments to discard
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Betterments to study further in Betterments to study further in RelicensingRelicensing
Betterments to study further in Betterments to study further in RelicensingRelicensing
Duncan Diversion ModificationsDuncan Diversion Modifications Seasonal Storage IncreasesSeasonal Storage Increases
French MeadowsFrench Meadows Hell HoleHell Hole
French Meadows-Hell Hole Pumped StorageFrench Meadows-Hell Hole Pumped Storage Small Hydro AdditionsSmall Hydro Additions
Hell Hole UpgradeHell Hole Upgrade InterbayInterbay RalstonRalston
Ralston Powerhouse Capacity UpgradeRalston Powerhouse Capacity Upgrade Sediment ManagementSediment Management
Duncan DiversionDuncan Diversion North & South Long Canyon DiversionsNorth & South Long Canyon Diversions InterbayInterbay Ralston AfterbayRalston Afterbay
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Middle Fork Project WatershedMiddle Fork Project WatershedMiddle Fork Project WatershedMiddle Fork Project Watershed
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Betterments to be Studied in RelicensingBetterments to be Studied in RelicensingBetterments to be Studied in RelicensingBetterments to be Studied in Relicensing
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Duncan Creek DiversionDuncan Creek DiversionDuncan Creek DiversionDuncan Creek Diversion Main problem is blockage of the intake Main problem is blockage of the intake
with trash during stormswith trash during storms Important because it is at the top of the Important because it is at the top of the
systemsystemUpgrade trash rack Upgrade trash rack structure to structure to alleviate trash alleviate trash blockagesblockages
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French Meadows seasonal water French Meadows seasonal water storage increase within existing flood storage increase within existing flood
storage poolstorage pool
French Meadows seasonal water French Meadows seasonal water storage increase within existing flood storage increase within existing flood
storage poolstorage pool
Raise dam crest in conjunction with spillway modifications for revised Probable Maximum Flood (PMF)
Additional storage of 5,000 AF can be accomplished with a 3.5 ft (approx) raise
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French Meadows SpillwayFrench Meadows SpillwayFrench Meadows SpillwayFrench Meadows Spillway
Dam safety studies have investigated both widening the spillway and raising the crest of the dam
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Hell Hole seasonal water storage Hell Hole seasonal water storage increase within existing flood storage increase within existing flood storage
poolpool
Hell Hole seasonal water storage Hell Hole seasonal water storage increase within existing flood storage increase within existing flood storage
poolpool
10 foot seasonal increase in operating level May–September would add 12 TAF
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Add crest gates to existing Add crest gates to existing spillway for storage increase spillway for storage increase
during Summerduring Summer
Add crest gates to existing Add crest gates to existing spillway for storage increase spillway for storage increase
during Summerduring Summer
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Typical Spillway Crest GatesTypical Spillway Crest GatesGranite Reef Diversion - ArizonaGranite Reef Diversion - Arizona
Typical Spillway Crest GatesTypical Spillway Crest GatesGranite Reef Diversion - ArizonaGranite Reef Diversion - Arizona
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Add/Upgrade Small HydroAdd/Upgrade Small HydroAdd/Upgrade Small HydroAdd/Upgrade Small Hydro
PotentialPotential Upgrade Hell Hole Upgrade Hell Hole
powerhouse powerhouse capacitycapacity
Add small hydro Add small hydro plants on flow plants on flow outlets at Interbay outlets at Interbay and Ralston and Ralston Afterbay DamsAfterbay Dams
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Add/Upgrade Small HydroAdd/Upgrade Small HydroAdd/Upgrade Small HydroAdd/Upgrade Small Hydro
Next StepNext Step Include provision for Include provision for
fish release hydro fish release hydro facilities in Project facilities in Project Description for Description for Relicensing. Relicensing.
Relicensing Instream Relicensing Instream flow studiesflow studies
Finalize when flow Finalize when flow release patterns release patterns established.established.
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Hell Hole - French MeadowsHell Hole - French Meadows Pumped-Storage Pumped-Storage
Hell Hole - French MeadowsHell Hole - French Meadows Pumped-Storage Pumped-Storage
Opportunity for pumped-storage between existing Opportunity for pumped-storage between existing reservoirsreservoirs
52 MW project maximizes use of hydraulic capacity 52 MW project maximizes use of hydraulic capacity in French Meadows Tunnelin French Meadows Tunnel
Recovers lost head below French Meadows Recovers lost head below French Meadows PowerhousePowerhouse
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Ralston Capacity IncreaseRalston Capacity IncreaseRalston Capacity IncreaseRalston Capacity Increase Hydraulic capacity of Hydraulic capacity of
Middle Fork Middle Fork Powerhouse (1000 cfs) Powerhouse (1000 cfs) is higher than Ralston is higher than Ralston (925 cfs). (925 cfs).
Ralston should have Ralston should have higher hydraulic higher hydraulic capacity than Middle capacity than Middle Fork otherwise potential Fork otherwise potential spills at Interbayspills at Interbay
Ralston Powerhouse is Ralston Powerhouse is hydraulically limited – hydraulically limited – turbine limits outputturbine limits output
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Options at RalstonOptions at RalstonOptions at RalstonOptions at Ralston
Turbine- generator upgrade (if feasible)Turbine- generator upgrade (if feasible) Add second 11-MW unitAdd second 11-MW unit
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Ralston Next StepsRalston Next StepsRalston Next StepsRalston Next Steps
Evaluate upgrade Evaluate upgrade potential of existing potential of existing turbine/generator turbine/generator electrical equipmentelectrical equipment
Refine second unit Refine second unit option.option.
Evaluate electrical Evaluate electrical output constraintsoutput constraints
Study environmental Study environmental and operational and operational impacts during impacts during relicensing.relicensing.
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Sediment ManagementSediment ManagementSediment ManagementSediment Management Diversions blocked by sediment during and after major storm Diversions blocked by sediment during and after major storm
eventsevents Middle Fork and Ralston output affected during/after major storms Middle Fork and Ralston output affected during/after major storms
due to sediment accumulation in Interbay and Ralston Afterbay.due to sediment accumulation in Interbay and Ralston Afterbay. Middle Fork Power Plant operation is constrained by gravel Middle Fork Power Plant operation is constrained by gravel
movement in tunnel and rock trap issues.movement in tunnel and rock trap issues. Sediment removal and disposal – outage and cost liabilitySediment removal and disposal – outage and cost liability
Improve sediment pass-through in Interbay and Ralston during floods
Improve diversions
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SummarySummarySummarySummary
Betterments to carry forward in relicensing.
Project DescriptionJune 2006
Technical/environmental studies and
agency/public consultation 2007-2010
Include viable projects in
License Application
Initial data collection evaluation & screening
Inventory of potential betterments