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. • 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.
PRESENTERS Leah Olivarri Esteban Ramos Dave Buzan Jason Cocklin
PROJECT TEAM MEMBERS Nikolay Voutchkov Jorge Arroyo Neil Callahan Mike Morrison Katie Leatherwood Tom Dixon Dr. Ernest To Jeremy Rice
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
Coastal Bend Water Supply Development
SURFACE WATER SUPPLIES Innovative approaches ... practical results ... outstanding service
Pre-2017 Safe Yield (125k) = 219k AFY Firm Yield 75% of Firm Yield Supply Model, Survey, 20 MGD SWD Plant LNRA Recall Innovative approaches ... practical results ... outstanding service
Introduction to Seawater Desalination & Project Status Updates
Seawater Desalination Illustrative Process Diagram Innovative approaches ... practical results ... outstanding service
PROJECT STATUS UPDATES Phase 1 Phase 2 Phase 3 2014 – 2017 2017 - 2020 2020 - 2025 Technical & Confirm/Define Procurement Economic Project Financial Feasibility Project Siting Closing Project Permitting Design, Prototype Construction, Outreach HRI Siting Commissioning Report
PROJECTS DEFINED 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 Innovative approaches ... practical results ... outstanding service
PLANT SITING 2 19 4 Qualitative Detailed Permitting Preferred Potential Candidate Phase Screening Evaluation Sites Sites Sites Screening Parameters Evaluation Parameters • Social & Environmental • Environment • Tract Characteristics • Cost • Water Quality • Preliminary Diffusion Modeling • Intake • Water Quality • Discharge • Surveys • Product Water Delivery • Permitting Considerations • Power
Short Break for Written Questions
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.
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.
CONSIDERATIONS FOR A SEAWATER DESALINATION INTAKE Mitigating Impingement and Entrainment • Wedge-wire screen narrow openings (2mm to 3mm wide) • Low inlet velocities (<0.5fps)
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.
CONSIDERATIONS FOR A SEAWATER DESALINATION DISCHARGE • Permitting Requirements • Jet Diffusion • ADCPs & Dispersion Modeling – Near Field and Far Field • Temperature < 1.5 o F above Ambient
SALINITY TOLERANCES Optimum Maximum
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.
CONCENTRATE MIXING AND DISPERSION – NEAR FIELD shore 50 ft 200 ft 400 ft Source: Sustainable Management of Desalination Plant Concentrate; Voutchkov N., International Desalination Association World Congress, 2019.
CORPUS CHRISTI BAY VOLUME 282,000,000,000 Gallons (865,513 ac-ft) • Inflows • Outflows • Rain & Runoff • Evaporation • River water • Outflow to • Tidal water ocean • Tidal water • Municipal/Industrial Discharges
NATURAL SALINITY VARIATIONS CORPUS CHRISTI BAY TCEQ SWQMS 13407
CORPUS CHRISTI BAY DYNAMICS Evaporation Discharges River Inflow Bay Outflow ~ 552 MGD Tidal flow ~ 3,312 MGD
Evaporation Discharges River Inflow Bay Outflow ~ 552 MGD Concentrate Potable Tidal Exchange Water ~ 3,312 MGD Bay Water Public Water System Desal Plant
IMPACT ON BAY SALINITY – FAR FIELD 180 Desal Production (MGD) 160 140 120 100 80 60 40 20 0 0.3 0.6 Increase in Bay Salinity (ppt) No Return Flows With Return Flows NATURAL RANGE OF SALINITY CORPUS CHRISTI BAY 25 TO 42 ppt
Short Break for Written Questions
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.
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
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
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.
Short Break for Written Questions
Open Q&A
CITY OF CORPUS CHRISTI
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