CITY OF CORPUS CHRISTI

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VIRTUAL MEETING LOGISTICS

PRESENTERS

Dave Buzan Jason CocklinEsteban RamosLeah Olivarri

PROJECT TEAM MEMBERS

Nikolay Voutchkov Mike Morrison

Tom DixonKatie LeatherwoodJeremy Rice

Neil Callahan

Dr. Ernest To

Jorge Arroyo

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

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

SURFACE WATER SUPPLIES

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

Pre-2017 Safe Yield (125k) = 219k AFY

20

MG

D S

WD

Pla

nt

Su

pp

ly M

od

el,

Su

rve

y,

LNR

A R

eca

ll

75% of Firm Yield

Firm Yield

Introduction to Seawater Desalination& Project Status Updates

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

Seawater DesalinationI l lus t rat ive Process Diagram

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

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

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

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 INTAKEMapping 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 < 1.5oF 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

Source: Sustainable Management of Desalination Plant Concentrate;

Voutchkov N., International Desalination Association World Congress, 2019.

sho

re

50 ft

200 ft

400 ft

CORPUS CHRISTI BAY VOLUME282,000,000,000 Gallons (865,513 ac-ft)

• Inflows

• Rain & Runoff

• River water

• Tidal water

• Municipal/Industrial Discharges

• Outflows

• Evaporation

• Outflow to ocean

• Tidal water

NATURAL SALINITY VARIATIONSCORPUS CHRISTI BAY

TCEQ SWQMS 13407

CORPUS CHRISTI BAY DYNAMICS

Ev

ap

ora

tio

n

Discharges

River Inflow Bay Outflow

Tidal flow

~ 552 MGD

~ 3,312 MGD

Ev

ap

ora

tio

n

Discharges

~ 552 MGD

~ 3,312 MGD

River Inflow Bay Outflow

Tidal Exchange

Public Water System

Desal Plant

Bay Water

ConcentratePotable

Water

IMPACT ON BAY SALINITY – FAR FIELD

NATURAL RANGE OF SALINITY

CORPUS CHRISTI BAY

25 TO 42 ppt

0

20

40

60

80

100

120

140

160

180

0.3 0.6

Desa

l Pro

ducti

on (

MG

D)

Increase in Bay Salinity (ppt)

No Return Flows With Return Flows

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 COSTSFirst 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