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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)