Temperance FlatReservoir Project

Climate change increases water

supply challenges

Why San Joaquin River Storage Is Needed

Zero allocation to CVP Friant and SOD in 2014 & 2015

Two years’ worth of Friant delivery in 2017 flood releases

Millerton Lake has no long-term

storage space

Restoration addsto Friant operating

complexities

Management of flow releases

Water temperature for fish life stages

Regional groundwater

overdraft is critical

Early runoff means less inflow can be delivered or stored

Higher temperature reduces restoration effectiveness

Subsidence has reduced regional delivery capability

Half of land area of all California high priority SGMA basins are in the San Joaquin Valley

Water shortages cause economic

impacts

390 TAF active storage capacity

1,800 TAF average annual inflow250 TAF/yr average flood release

Applicant Partners and Implementation

• 5 Counties• Large and small cities• Over 3 million acres• Tribal interests

In coordination with

A broad group of water users is conducting evaluations to define investor commitments

Temperance Flat Project Facilities

Dam– Roller Compacted Concrete

(RCC)– 665 ft tall

Reservoir– 1.33 MAF total – 1.26 MAF net

Powerhouse– 160 MW– 6,000 cfs

A 1930 study found Temperance Flat Dam site superior for water storage but

recommended Friant Dam due to cost and project purposes planned at the time

Dam and Reservoir Features

• Dam and Reservoir• RCC Dam• Reservoir Clearing• Fine Gold Creek Bridge• Contractor Use Areas• Haul Roads• Permanent Access Roads

• Diversion• Embankment Cofferdams• Diversion Stop-logs

• Spillway• RCC Spillway• RCC Spillway Bridge

• Outlet Works & Power Features• Diversion and Outlet Tunnel & Portals• Low Level Intake Structure• Powerhouse, Valve House, & Outlet• Transmission• Haul Roads• Permanent Access Roads• Powerhouse Access Bridge• Works Chute

• Affected Infrastructure• Kerckhoff Powerhouses Decommissioning• Utilities• Transmission Line Relocation• Recreational Facilities

Project Facilities

Reclamation Performed Constructability and Cost Reviews: • Value Planning• Value Engineering• Design, Estimating and Construction (DEC)

Water Sources for Temperance Flat Reservoir Project

San Joaquin River flood flows that exceed Millerton Lake management capability and SJRRP requirements

Regional Supplies from other watersheds and sources, as demonstrated by Kings River exchange

South-of-Delta Supply such as allocations and

acquired water

Millerton Lake

Friant-Kern Canal Deliveries

Madera Canal Deliveries

Benefits will be Managed Through Storage Accounts

SJRRP Releases

Temperance Flat Reservoir

Millerton Spills

Storage Accounts

Storage account management will be through a new entity or partnership

Temperance Flat operations preserve Friant Division Capabilities

How Project Operations Achieve Benefits

Water Supply• Help stabilize Friant and SOD supplies

• Support groundwater sustainability

Hydropower• Net increase at Friant after replacing

lost Kerckhoff project generation

Ecosystem• Improved water temperature for SJRRP

releases to the San Joaquin River

• Downstream delivery increases flows and further improves temperature

• Level 4 Refuge water supply

Recreation• Net increase at Millerton Lake and

Temperance Flat Reservoir

Flood Control• Increased available capacity

Emergency Response • Stored water South of the Delta

Public Benefits Non Public Benefits

Physical Changes Produce Ecosystem Benefits

Floodplain Activation

River Flow

Water Temperature

Store HighInflow

Releases meet or exceed SJRRP Flows

Flow Changes Are Beneficial For Restoration

24% of Time 38% of Time

ReleaseSupplemental Flows

Releases exceed SJRRP Flows

No Change in Releases

Releases meetSJRRP Flows

38% of Time

Changes in Friant Dam Releases 2030 Simulation

24% of Time 38% of Time 28% of Time 36% of Time 36% of Time

24% of Time 36% of Time

2030 2070 Wet Moderately Warm

Flow Changes Are Maintained Under All Conditions

Store Release No Change

Store Release No Change

Store Release No Change35000 cfs

3500 cfs

350 cfs

35000 cfs

3500 cfs

350 cfs

38% of Time

40% of Time

2070

23% of Time 39% of Time 38% of Time

2070 Dry Extremely Warm

Store Release No Change

12%

Temperature Improvement for Eggs and Incubation

Eggs and Incubation

Rearing and Juvenile Migration

Adult Migration

Release Water Temperature - 2030 Simulation

Fewer releases exceed objective temperature

Water Temperature Improves Under All Conditions

Floodplain Activation is Improved

Wet Normal-Wet Normal-Dry DrySJR 1A1 Friant Dam to Hwy 41 -14% 64% 36% 25%SJR 1A2 Hwy 41 to Hwy 99 -12% 71% 40% 27%SJR 1B1 Hwy 99 to Hwy 145 (Madera Ave.) -1% 82% 45% 32%SJR 1B2 Hwy 145 (Madera Ave.) to Gravelly Ford 7% 88% 50% 35%SJR 2A Gravelly Ford to Chowchilla Bypass 11% 91% 52% 36%SJR2B1 Chowchilla Bypass to Mendota Bypass 13% 92% 52% 36%

Mendota Bypass N/A N/A N/A N/ASJR 3B Mendota Bypass return to Avenue 7.5 8% 69% 35% 47%SJR 3C Avenue 7.5 (Firebaugh) to Sack Dam 8% 69% 35% 47%SJR 4A1 Sack Dam to Hwy 152 8% 80% 47% 86%SJR 4A2 Hwy 152 to Sand Slough Connector 8% 80% 47% 86%SJR4B 1A & 1B Sand Slough Connector to Turner Ave 0% 0% 0% 19%SJR4B 1C and 1D Turner Ave to Mariposa Bypass 0% 0% 0% 19%SJR 4B2 Mariposa Bypass to Bear Creek 6% 80% 47% 86%SJR 5A Bear Creek to Salt Slough 1% 79% 36% 69%SJR 5B Salt Slough to Mud Slough 3% 73% 27% 44%SJR 5C Mud Slough to Merced River 3% 54% 15% 34%

Description Percentage Change (-50% to 50%)

1

2

Mendota Dam

3

4

5

SJRRP Reach EDT Reach

Change in Floodplain Activation - 2030 Simulation

Floodplain Activation Improved Under All Conditions

2030 2070 2070 WMW 2070 DEW

SJR 1A1 Friant Dam to Hwy 41 24% 15% 8% 15%SJR 1A2 Hwy 41 to Hwy 99 26% 16% 7% 16%SJR 1B1 Hwy 99 to Hwy 145 (Madera Ave.) 29% 18% 6% 18%SJR 1B2 Hwy 145 (Madera Ave.) to Gravelly Ford 31% 18% 6% 19%SJR 2A Gravelly Ford to Chowchilla Bypass 32% 19% 6% 20%SJR2B1 Chowchilla Bypass to Mendota Bypass 32% 19% 6% 20%

Mendota Bypass N/A N/A N/A N/ASJR 3B Mendota Bypass return to Avenue 7.5 29% 14% 12% 15%SJR 3C Avenue 7.5 (Firebaugh) to Sack Dam 29% 14% 12% 15%SJR 4A1 Sack Dam to Hwy 152 31% 20% 17% 19%SJR 4A2 Hwy 152 to Sand Slough Connector 31% 20% 17% 19%SJR4B 1A & 1BSand Slough Connector to Turner Ave 0% 0% 0% 0%SJR4B 1C and Turner Ave to Mariposa Bypass 0% 0% 0% 0%SJR 4B2 Mariposa Bypass to Bear Creek 31% 20% 17% 19%SJR 5A Bear Creek to Salt Slough 46% 13% 7% 14%SJR 5B Salt Slough to Mud Slough 31% 2% -2% 3%SJR 5C Mud Slough to Merced River 14% -7% -10% -6%

Percentage Change (-50% to 50%)DescriptionEDT ReachSJRRP

Reach

1

Mendota Dam

2

3

4

5

Significant Fishery Abundance Improvement

Summary of Net Physical Changes

BENEFIT TYPE PHYSICAL EFFECT UNIT 2030 2070

PUBL

IC

Ecosystem Change in Spring-Run Chinook abundance % 24 231

Ecosystem Level 4 Refuge supply in dry & critical years TAF/yr 10 7

Emergency Response Water supply for Delta export disruption TAF 245 247

Flood Control Increase in incidental flood space TAF 63 106

Recreation Thousands of visitor-days at Millerton/TFR days 116 127

NO

N-P

UBL

IC Water supply Long term average TAF/yr 197 257

Hydropower Generation change at Friant Dam GWh/yr 13.8 13.2

Public & Non-Public Benefits Increase and Sustain

Public Benefit Ratio 2.86Benefit Cost Ratio 1.42

Temperance Flat Adds Flexibility in the Water System

East Side users can improve coordinated management with groundwater and local supplies

South-of-Delta users can move stored water from San Luis Reservoir to TFR with low risk of loss

SJRRP can more flexibly manage releases, such as pulse flows and ramping to establish riparian habitat

Refuge water program can store water in wet years for later use in dry years

Emergency supply south of the Delta location provides flexibility in response to a Delta outage

Flexibility With Potential Water System Improvements

• Friant-Kern and Madera canal capacity restoration• Friant-Kern Canal reverse flow (pump-back) project • Local water storage projects • San Luis Reservoir modifications• Delta-Mendota Canal Recirculation Project• Trans-Valley Canal• California WaterFix

Investor Operating PlanCost-Share Contracts

Administrative Agency Contracts

Project TimelineFinal EIS

Draft EIR

Federal• USACE• NMFS• ACHP• USFW• BLM

Local• Fresno Co.• Madera Co.• Air Quality

State• CDFW• SWRCB• DOC• Caltrans• State Lands

Start Construction

Fully Operational

Final EIR

2033

2030202420202018 2022

Permitting Complete

2021 2033

30%, 60%, 90%, Final DesignBid PackageAcquisition

Start Reservoir Filling

Public Benefits Begin

Public Benefits Fully Realized

Permitting

Final Project Definition Pre-Construction