CITY OF CORPUS CHRISTI VIRTUAL MEETING LOGISTICS Please do your - - PowerPoint PPT Presentation

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CITY OF CORPUS CHRISTI VIRTUAL MEETING LOGISTICS Please do your - - PowerPoint PPT Presentation

Apr 18, 2023 186 likes •539 views

CITY OF CORPUS CHRISTI VIRTUAL MEETING LOGISTICS Please do your best to monitor your mute buttons during the meeting when you are not speaking. During the presentation, feel free to submit written questions via the Chat button.

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CITY OF CORPUS CHRISTI

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  • Please do your best to monitor your mute buttons during the meeting when

you are not speaking.

  • During the presentation, feel free to submit written questions via the “Chat”

button.

  • At specific times during the presentation, we will take the opportunity to

answer questions.

  • At the end of the presentation, as time allows, we will open the forum for

additional questions from attendees.

VIRTUAL MEETING LOGISTICS

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PRESENTERS

Dave Buzan Jason Cocklin Esteban Ramos Leah Olivarri

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PROJECT TEAM MEMBERS

Nikolay Voutchkov Mike Morrison Tom Dixon Katie Leatherwood Jeremy Rice Neil Callahan

  • Dr. Ernest To

Jorge Arroyo

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PRESENTATION OUTLINE

  • Coastal Bend Water Supply Development
  • Introduction to Seawater Desalination &

Project Status Updates

  • Intake & Discharge Considerations
  • Corpus Christi Bay Dynamics
  • Project Costs and Financing
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Coastal Bend Water Supply Development

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Innovative approaches ... practical results ... outstanding service

SURFACE WATER SUPPLIES

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Innovative approaches ... practical results ... outstanding service

Pre-2017 Safe Yield (125k) = 219k AFY 20 MGD SWD Plant Supply Model, Survey, LNRA Recall 75% of Firm Yield Firm Yield

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Introduction to Seawater Desalination & Project Status Updates

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Innovative approaches ... practical results ... outstanding service

Seawater Desalination

Illustrative Process Diagram

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PROJECT STATUS UPDATES

Phase 1 2014 – 2017 Technical & Economic Feasibility Project Prototype HRI Siting Report Phase 2 2017 - 2020 Confirm/Define Project Project Siting Permitting Outreach Phase 3 2020 - 2025 Procurement Financial Closing Design, Construction, Commissioning

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Innovative approaches ... practical results ... outstanding service

Average Production Capacities in MGD

Production Phase Average Daily Production Inner Harbor Ship Channel Plant Initial Capacity 20 MGD Expandable / Ultimate Capacity 30 MGD La Quinta Channel Plant Initial Capacity 20 MGD Expandable Capacity 30 MGD Ultimate Capacity 40 MGD

PROJECTS DEFINED

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Permitting Phase

2 Preferred Sites

Screening Parameters

  • Social & Environmental
  • Tract Characteristics
  • Water Quality
  • Intake
  • Discharge
  • Product Water Delivery
  • Power

Evaluation Parameters

  • Environment
  • Cost
  • Preliminary Diffusion Modeling
  • Water Quality
  • Surveys
  • Permitting Considerations

PLANT SITING

Detailed Evaluation 4

Candidate Sites

Qualitative Screening 19 Potential Sites

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Short Break for Written Questions

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Intake and Discharge Considerations

Reminder: Type your questions in the Q&A box by clicking the Q&A button at the bottom of your screen.

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CONSIDERATIONS FOR A SEAWATER DESALINATION INTAKE

Mapping Sensitive Species & Ecosystems

  • Ecosystems and Species mapping during the siting phase
  • No oyster reefs, no critical habitat for federally listed species within 2,500ft for

intake or discharge zones.

  • Hardened shorelines can be habitats, too.
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CONSIDERATIONS FOR A SEAWATER DESALINATION INTAKE

Mitigating Impingement and Entrainment

  • Wedge-wire screen narrow
  • penings (2mm to 3mm wide)
  • Low inlet velocities (<0.5fps)
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CONSIDERATIONS FOR A SEAWATER DESALINATION INTAKE

Targeting Sustainability

  • Specifically targeting stable water

quality with optimal characteristics

  • Sufficient depth to reduce impacts

from any spills in the water body

  • Sufficient depth to mitigate

impacts to seagrasses

Desalination Plant Intake – Beckton, U.K.

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CONSIDERATIONS FOR A SEAWATER DESALINATION DISCHARGE

  • Permitting Requirements
  • Jet Diffusion
  • ADCPs & Dispersion

Modeling – Near Field and Far Field

  • Temperature < 1.5oF above

Ambient

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SALINITY TOLERANCES

Optimum Maximum

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Corpus Christi Bay Dynamics

Reminder: Type your questions in the Q&A box by clicking the Q&A button at the bottom of your screen.

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CONCENTRATE MIXING AND DISPERSION – NEAR FIELD

Source: Sustainable Management of Desalination Plant Concentrate; Voutchkov N., International Desalination Association World Congress, 2019.

shore

50 ft 200 ft 400 ft

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CORPUS CHRISTI BAY VOLUME 282,000,000,000 Gallons (865,513 ac-ft)

  • Inflows
  • Rain & Runoff
  • River water
  • Tidal water
  • Municipal/Industrial Discharges
  • Outflows
  • Evaporation
  • Outflow to
  • cean
  • Tidal water
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NATURAL SALINITY VARIATIONS CORPUS CHRISTI BAY

TCEQ SWQMS 13407

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CORPUS CHRISTI BAY DYNAMICS

Evaporation

Discharges River Inflow Bay Outflow Tidal flow ~ 552 MGD ~ 3,312 MGD

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Evaporation

Discharges ~ 552 MGD ~ 3,312 MGD River Inflow Bay Outflow Tidal Exchange Public Water System Desal Plant Bay Water Concentrate Potable Water

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IMPACT ON BAY SALINITY – FAR FIELD

NATURAL RANGE OF SALINITY CORPUS CHRISTI BAY

25 TO 42 ppt

20 40 60 80 100 120 140 160 180 0.3 0.6

Desal Production (MGD)

Increase in Bay Salinity (ppt) No Return Flows With Return Flows

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Short Break for Written Questions

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Project Costs and Financing

Reminder: Type your questions in the Q&A box by clicking the Q&A button at the bottom of your screen.

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PROJECT COSTS

First SWIFT Loan

  • $2.75M with no impact on general water rates
  • Principal and interest payments deferred up to 8-years

Second SWIFT Loan – Development of Inner Harbor Plant 20 MGD Expandable to 30 MGD Capital Cost ($222M) Operations & Maintenance Costs Construction = $164M $16M annually (includes treatment to potable) Non-Construction = $26M Contingencies = $32M Objective – No RATE SHOCK, i.e. minimal or no impact to general water rates

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PROJECT FINANCING

Water Supply Development Funds - $0.05/kgal ($1.6M/year) Large Volume Users’ Additional Contributions - $0.25/kgal ($3M/year) TWDB State Water Implementation Fund for Texas (SWIFT)

  • Subsidized Loan – Interest approx. 2% or less
  • 30 Year Term
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COST OF TREATED WATER

$3.50 to $4.50 per thousand gallons

  • Includes substantial contingency estimates
  • Work continues to refine the cost estimates and will continue

through establishment of a contract for design and construction with a private contractor.

  • This is a supplemental supply, so only a portion of the regional

water supply will be developed at this rate.

  • The cheapest water supply is always the one you already have.
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Short Break for Written Questions

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Open Q&A

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CITY OF CORPUS CHRISTI