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Filename.ppt/1 Santa Fe Basin Study and Reclaimed Wastewater Feasibility Study Prepared for the Santa Fe Commission on Sustainability Andrew Erdmann Water Resources Coordinator 12.14.16

Santa Fe Basin Study and Reclaimed Wastewater Feasibility

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Santa Fe Basin Study and Reclaimed

Wastewater Feasibility Study

Prepared for the Santa Fe Commission on Sustainability

Andrew Erdmann

Water Resources Coordinator

12.14.16

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Presentation Topics

• Background on Santa Fe Water

− Conservation

− Demand

• Basin Study

− Process

− Findings

• Reclaimed Wastewater Feasibility Study

− Process

− Findings

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Santa Fe’s industry-leading conservation

programs are working

Customers

Consumption

(gpcd)

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Conservation and conjunctive use have led to

greater sustainable water supply

Potable Water Demand

Surface Water Use

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Santa Fe Basin Study

• Developed through preliminary assessment of ongoing practices and public outreach

• Evaluation of water supply and demand for City-County combined water system in 2055, based on climate and population projections

• Development of proposed adaptation strategies

Reclaimed Wastewater Feasibility Study

• Still in Draft Form

• Detailed evaluation of proposed adaptation strategies

• Ranking of strategies based on Triple Bottom Line analysis

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Basin Study:

Projected Climate Changes

Key Takeaways: • Upward of 75% Snowpack Reduction by the

2070s

• 5 Degree F Temperature Increase by 2050

• Higher Evapotranspiration Rates

• Potentially Greater Monsoonal Intensity

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Basin Study:

Historic Climate Variability

City

Well

Field

Buckman

Well Field

Buckman Well

Field expansion

and Direct

Diversion

New water supply sources added

during times of drought

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Santa Fe Basin Projected 2055 Water Supply Gap

Climate Scenario

Simulated Historic

(no climate

change)

Central

Tendency

Warm-

Wet Hot-Dry

Total Demand - Average

Annual (AFY) 21,643 22,925 22,646 23,299

Total Supply - Average Annual

(AFY) 16,488 15,550 16,304 13,976

Water Supply Gap – Difference

between Demand and Supply

(AFY)

-5,155 -7,375 -6,342 -9,323

Basin Study: Projected Gap between

Water Supply and Demand (2055)

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Basin Study: Developing Adaptation

Strategy Portfolios using WaterMAPs

Preliminary Assessment

Fill Supply Gaps

Sustainable Groundwater Pumping

90% of years, deficits are less than 100 AFY

Weighted Criteria and Scoring

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Basin Study:

Adaptation Strategies

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Basin Study: Water Reuse Availability

0

2000

4000

6000

8000

10000

12000

2007 2008 2009 2010 2011 2012 2013 2014

Acre

Feet

per

Year

Total Demand

Reclaimed Wastewater Produced

Reclaimed Wastewater Used

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Climate change will impact

supply AND demand

Shortages up to 9,300 AFY

by 2055

Expanding water reuse is

key for mitigating gaps

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Reclaimed Water Feasibility Study (RWFS):

Reuse in Santa Fe – Long History

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How Much Water is Available for Reuse?

0

1

2

3

4

5

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

Mo

nth

ly A

vera

ge F

low

(m

gd

)

Assumed Releases to Lower Santa Fe River

Existing Non-Potable Reuse Contracts

1,500 AFY

Remaining Discharge Available for Additional Reuse

2,400 AFY

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Water Reuse Feasibility Study Alternatives

Expand Non-

Potable Reuse

Rio Grande Return Flow

Credits

Indirect or Direct

Potable Reuse

Advanced Water

Purification Facility

Conveyance Conveyance Conveyance

Enhanced Living River and

Aquifer Storage & Recovery

Aquifer Storage & Recovery via

Lower Santa Fe River

Buckman Wells ASR

Augment Nichols Reservoir

Direct Potable Reuse

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Cost-Effectiveness Varies Widely

Highest cost per

acre-foot of water

supply benefit

Lowest

cost

per AF

+130

AFY +1300 to +2300 AFY

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Preliminary Alternatives Screened

to Four Using Weighted Screening

Criteria

Expand Non-

Potable Reuse

Rio Grande Return Flow

Credits

Indirect or Direct

Potable Reuse

Enhanced Living River and

Aquifer Storage & Recovery

Aquifer Storage & Recovery via

Lower Santa Fe River

Buckman Wells ASR

Augment Nichols Reservoir

Direct Potable Reuse

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+2300 A

FY

• Reroute up to 3 mgd WRF discharge by pumping to Rio Grande

• Exchange for Rio Grande water

• Divert additional 2300 AFY through existing Buckman system

Alternative 2 Full Use of SJCP Rights via Rio Grande Return Flow Credits

Up

to

3 m

gd

Paseo Real WRF

Buckman WTP

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Alternative 3 Enhanced Living River and Upper Santa Fe River Recharge

• Discharge to Upper Santa Fe River at Two Mile

• Living River

• Divert via upper aquifer wells below Siler Road

Up to 3 mgd

Paseo Real WRF

Recovery

Wells

Advanced

Water

Purification

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Alternative 4 Aquifer Storage and Recovery via Lower Santa Fe River

• Discharge to Lower Santa Fe River at Siler Rd.

• Divert via upper aquifer wells below Siler Road

Up to 3 mgd

Paseo Real WRF

Recovery

Wells

Advanced

Water

Purification

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Up

to

3 m

gd

• Up to 3 mgd to Advanced Water Purification Facility

• Pump to Buckman WTP for blending with Rio Grande raw water & further treatment

Alternative 7 Direct Potable Reuse

Paseo Real WRF

Buckman WTP

Advanced Water

Purification Facility

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Decision Scores using TBL Criteria

0 0.1 0.2 0.3 0.4 0.5 0.6

2: Rio Grande Return

flow credits / exchange

7: Direct Potable Reuse

4: ASR via Lower SFR

3: Enhanced Living

River & ASR

Weighted Decision Score

ECONOMIC: Cost-Effective Supply Augmentation

SOCIAL: Public Benefit and Social Acceptability

ENVIRONMENTAL: Protect and Sustain the Environment

TECHNICAL: Timely Implementability and Operability

TECHNICAL: Project Risk Mitigation

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Ensuring Future Water Supply for

the Santa Fe Basin

USGS

Thank You!

Questions?

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Additional

Reference Slides

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FS Alternative 1 Expand Non-potable Reuse

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Challenges in Expanding Non-Potable Reuse:

Seasonal Demand, Limited Summer Supplies

+45 AFY

+130 AFY

Demand is Highest when Available Supply is Lowest!

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FS Alternative 2 Rio Grande Return Flow Credits/Exchange

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FS Alternative 3 Upper Santa Fe River Recharge

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FS Alternative 4 Lower Santa Fe River Recharge

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FS Alternative 5 Buckman Wells Aquifer Storage and Recovery

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FS Alternative 6 Nichols Reservoir Augmentation

<< RETURN

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FS Alternative 7 Direct Potable Reuse

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Significant Potential for a

Multi-Benefit Project?

• Living River

• Soil aquifer

treatment

• Recharge

• Preserve

storage in

Canyon

Reservoirs

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Triple Bottom Line

Analysis

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Climate change will impact

supply AND demand

Shortages up to 9,300 AFY

by 2055

Expanding water reuse is

key for mitigating gaps

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Triple Bottom Line analysis

ECONOMIC: Cost-Effective Supply Augmentation

SOCIAL: Public Benefit and Social Acceptability

ENVIRONMENTAL: Protect and Sustain the Environment

TECHNICAL / OTHER: Timely Implementability and Operability

TECHNICAL / OTHER: Project Risk Mitigation

Subcriteria and performance measures further define each criterion

Weighted criteria decision model

illustrates tradeoffs with sensitivity analyses

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Decision Scores using TBL Criteria

0 0.1 0.2 0.3 0.4 0.5 0.6

2: Rio Grande Return

flow credits / exchange

7: Direct Potable Reuse

4: ASR via Lower SFR

3: Enhanced Living

River & ASR

Weighted Decision Score

ECONOMIC: Cost-Effective Supply Augmentation

SOCIAL: Public Benefit and Social Acceptability

ENVIRONMENTAL: Protect and Sustain the Environment

TECHNICAL: Timely Implementability and Operability

TECHNICAL: Project Risk Mitigation

Highest Water Supply Benefit,

Lowest Cost

Minimal Additional Piping for

Future Connection

Future Stormwater

Recharge?

Use Reservoir Bypasses

for Living River

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Key Takeaways

Conservation and

sustainable supplies

are critical

Expanding

non-potable reuse

would fall short of

supply goals

Higher supply benefit

more cost-effective

Full use of SJCP rights

via Rio Grande Return

Flow Credits: cost-

effective and simple

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Basin Study: Adaptation Portfolios

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000P

ort

folio

1

Po

rtfo

lio

2

Po

rtfo

lio

3

Po

rtfo

lio

4-5

Po

rtfo

lio

6

Po

rtfo

lio

7-8

Additional Water Rights

Infiltration ASR

Direct ASR

Conservation

Direct Reclaimed Water Reuse (AFY)