City of Corpus Christi Raw Water Supply Strategies Council - - PowerPoint PPT Presentation

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City of Corpus Christi Raw Water Supply Strategies Council - - PowerPoint PPT Presentation

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City of Corpus Christi Raw Water Supply Strategies Council Presentation July 24, 2018 1 Current Water Supply 2 2017 Corpus Christi Regional Customer Water Demand 10% 4% City of Corpus Christi 1% 3% SPMWD 3% Alice 6% Beeville Mathis

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Council Presentation July 24, 2018

City of Corpus Christi Raw Water Supply Strategies

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Current Water Supply

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2017 Corpus Christi Regional Customer Water Demand

59% 18% 6% 3% 1% 3% 4% 10% City of Corpus Christi SPMWD Alice Beeville Mathis Treated Wholesale Raw Water Industries Water Loss

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2017 Corpus Christi Raw Water Customer Demand & Projection

219 177 177 177 177 177 177 11.0 11.0 11.0 11.0 7 7 7 50 100 150 200 250 2016 2017 2020 2025 2030 2040 2050 Volume (1,000 Acre-Feet) Years

Reuse Desalination Surface Water Current Demand Projection 2017 % of Safe yield used ≈ 59% 2025 Projected % of Safe yield used ≈ 75%

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2017 and Projected 2025 Corpus Christi Treated Water Demand Profile

46% 36% 18%

2017 C.C. Treated Water Demand Profile

Industrial Residential Commercial 69% 20% 11%

Projected 2025 C.C. Treated Water Demand Profile

Industrial Residential Commercial

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Regional Water Supply

Strategies

  • Irrigation Water Conservation
  • Manufacturing Water Conservation
  • Mining Water Conservation
  • Brackish Groundwater Desalination
  • Potential Water System

Interconnections

  • Local Balancing Storage Reservoir
  • Lavaca Off-Channel Reservoir

Project

  • GBRA Lower Basin Storage Project
  • SPMWD Industrial WTP

Improvements

  • Municipal Water Conservation
  • Reclaimed Wastewater Supplies

and Reuse

  • Gulf Coast Aquifer Supplies
  • Seawater Desalination &

Variable Salinity Program

  • O.N. Stevens WTP

Improvements

Regional Water City of Corpus Christi

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2016 Region N Water Management Strategies

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Water Conservation

  • Water Conservation:
  • Year-round management

strategy,

  • Sustainable Water Supply – by

reducing per capita use;

  • Defers Capital Costs – Reductions

in demand delay the need for new supplies;

  • Reduces Peak Demand –

less stress on Water

  • perations;
  • Reduces Energy Costs –

Reduces the amount of water pumped, thus reducing electric costs. ▪ San Antonio Water System: ▪ San Antonio’s Cheapest source of water is conservation – 2070 Goal Residential Gallons Per Capita Per Day ≈ 55; ▪ The City of Corpus Christi’s – Current Residential Gallons Per Capita Per Day ≈ 63

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Reuse

  • Current use:

▪ Approx. 5-7 mil gal/month

  • Reuse - Water Quality

▪ Type II discharge ▪ High Chlorides – Industrial customers have concerns

  • Studies have been

conducted to see if supply could meet Industrial needs

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Surface Water

  • Guadalupe Blanco River Authority,

Lower Basin Storage Project

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Desalination

  • Projected Desalination: 11,000 to 22,000 Acre Feet a Year
  • Corpus Christi Projects:
  • Brackish
  • Seawater Desalination
  • Other projects within the

Area:

▪ The Port of Corpus Christi ▪ M&G

  • Objectives:
  • Permitting
  • Site Location
  • Drought-proof

Water Supply

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Groundwater / Aquifer Storage & Recovery

  • Each method varies according to:
  • Location
  • Aquifer size,
  • Water Quality, and
  • land ownership
  • Aquifer Storage & Recovery:
  • The City is currently evaluating

the feasibility within City limits

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Groundwater / Aquifer Storage & Recovery

  • What is the Modeled Available

Groundwater, in the project area?

  • What is the production volume per

day of the well Field?

  • Who are the principal owners of the

land that the well field?

  • Have samples of the

groundwater been tested for chemistry, radiological, and metals?

  • Groundwater Request For Information is being developed
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Groundwater or Desalination? Diversification of Water Supply

Frank C. Brogan, P.E.

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Groundwater or Desalination?

Meeting with San Antonio Water System (SAWS) July 12, 2018

Purpose:

  • 1. Vista Ridge Groundwater Project – Lessons Learned
  • 2. Brackish Groundwater Desalination Project
  • 3. Aquifer Storage and Recharge
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July 12,2018 Page 2

San Antonio Water System (SAWS)

One of the nation’s largest municipally owned utilities

  • Created in 1992

– Merger of three city departments – Separate Board of T rustees appointed by City Council

  • Serve 1.8 million people) (236,000 Ac Ft/Yr = 211 MGD)
  • 12,000+ miles of pipe
  • $2 billion 5-year capital program
  • 1,700 employees
  • AA+ creditrating

San AntonioWater Management

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Page 12 July 12,2018

HistoricalView

Challenges San AntonioWater Management

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Page 13 July 12,2018

Previously Planned Projects

San AntonioWater Management

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Page 14 July 12,2018

Planned Projects Came Up Dry

San AntonioWater Management Project Name Year Planned PlannedYield (AF) Dollars Expended Yield Applewhite Reservoir I 1980s 48,000 $40 M Applewhite Reservoir II 1990s 60,000 Simsboro Groundwater 1998 55,000 $4 M Lower Guadalupe Project 2001 94,500 $6 M LCRA – SAWS Water Project 2002 150,000 $42 M

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Page 15 July 12,2018

Projects Successfully Completed…Sort of…

San AntonioWater Management Project Year Planned Year Completed Planned Yield (AF) Yield Regional Carrizo Project 2000 2013 56,000 11,688 Brackish Desalination Project 2004 2017 *29,000 13,000

* 2008 RW Beck projection

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Page 16 July 12,2018

Political, Legal and Regulatory

San AntonioWater Management

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July 12,2018 Page 18

Securing ourWater Future Through Open Bid

Shifting Risks to Private Sector

  • September 2010 – RFI to determine types of projects available

– Groundwater – SurfaceWater – Desalination – Other Sources – Location – Water Quality San AntonioWater Management

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July 12,2018 Page 19

Securing our Water Future Through Open Bid

Shifting Risks to Private Sector

  • January 2011 – RFCSP solicitation issued for 20K AFY

, with ability to gradually increase up to 80,000 AFY

– Ownership/Control – Permit stability – Risks – ProjectApproach – Water Quality – Cost San AntonioWater Management

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Page 21 July 12,2018

Shortlisted Candidates

San AntonioWater Management

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Page 22 July 12,2018

Candidates Not Willing to Accept Supply Risks

San AntonioWater Management

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Page 23

  • Further discussions led to

acceptance of risk by Vista Ridge

  • Publically negotiated Contract

through posted Open Meetings

  • Significant Public Outreach

prior to City Council approval

July 12,2018

Back to the Public Negotiation T able

Vista Ridge Project San AntonioWater Management

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Page 24 July 12,2018

Vista Ridge – Public-PrivatePartnership

Historic Risk Shifting

  • 50,000 AFY (45 MGD); SAWS only

pays for water made available

  • T

wo 30 year terms

  • Assets transfer to SAWS in 2050
  • Fixed price for Infrastructure & Water

(O&M, Electrical areVariable)

  • ~$2,000 per AF for allcomponents

San AntonioWater Management

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Page 26 July 12,2018

ProjectTimeline

Development

< 30months

Construction

< 54months

Operation

30 years

Project Continues

30+ years

Financial Close

November 2016

Water Delivery Begins

~ April2020

AssetT ransfer to SAWS

~ 2050

Debt Service Drops Off!

Commercial Close

November 2014

SAWS to complete system Integration by January 2020

San AntonioWater Management

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Page 32 July 12,2018

Supply Portfolio Diversification (drought year)

1996 1996 2070 2070

San AntonioWater Management

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Vista Ridge Water Cost Breakdown:

  • Water Purchase Price

$460/ac ft

  • Infrastructure Debt Service and Finance $1,146/ac ft*
  • Operation and Maintenance

$196/ac ft

  • Electricity

$191/ac ft Total Cost $1,993/ac ft $6.11/ 1000 gal. Increases Avg. Water Bill $10.00/month *Cost eliminated during second 30 year period

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Brackish Groundwater Desalination Project

  • 12 MGD – 13,440 acre ft/yr – 53,000 Households
  • Modular Approach
  • Project Cost $210 million
  • Production Began November 9, 2016
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Aquifer Storage and Recharge

  • Purpose is Storage for Future Recovery
  • SAWS bought 6,000 acres of farm and ranch land
  • Mitigation Program for affected existing wells
  • Installed 29 recharge and recovery wells
  • Pumping Rate - 64 MGD
  • Total Storage Capacity – 233,000 acre feet of water
  • Currently stores – 70% of SAWS annual water demand
  • $250 million
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Lessons Learned:

  • Public Outreach is essential
  • Planning for future (long term!) is critical
  • New sources must be carefully examined and vetted
  • Obtaining new water supplies involves risk
  • Risk can be shared or shifted
  • Shifting risk to the supplier significantly increases

cost

  • Water will only get more expensive
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Recommendations:

  • Continue diversification of water supply
  • Aggressively plan for future growth
  • Pursue Desalination and Groundwater
  • Negotiate, obtain and permit both options
  • Have both ready to execute at the appropriate time
  • Consider Aquifer Storage and Recharge