Comparisons

How the Texas Water Backbone compares to alternatives

Backbone vs. Reservoirs

The traditional approach to Texas water supply has been building reservoirs. How does the Backbone compare?

FactorTexas Water BackboneMarvin Nichols Reservoir
Water SourceOcean (unlimited)Rainfall (variable)
Drought Reliability100%Weather-dependent
Land ImpactPipeline corridor66,000+ acres flooded
Regional PoliticsNo water taken from East TXEast TX sacrifice for DFW
Timeline to Water8-10 years15-20+ years (legal battles)
Cost per AF$1,400$800-1,200 (when full)
Climate RiskNoneIncreasing with climate change
The hidden cost of reservoirs: Reservoir costs assume they fill. In drought—when water is most needed—reservoirs may be empty. The Backbone delivers regardless of weather.

Why Not Both?

Reservoirs and the Backbone serve different purposes:

  • Reservoirs: Store water when it rains, release when needed
  • Backbone: Provide baseload supply independent of rainfall

A resilient Texas water system might include both—but the Backbone provides the drought-proof foundation that reservoirs cannot.

Desalination Precedents

Large-scale desalination is proven technology operating worldwide:

FacilityLocationCapacityOnline
Tampa Bay DesalFlorida25 MGD2007
Carlsbad DesalSan Diego50 MGD2015
Sorek BIsrael53 MGD2023
Jubail 3ASaudi Arabia140 MGD2024

Key lessons from existing facilities:

  • Desalination costs have declined 50%+ over 20 years
  • Reliability exceeds 95% for modern facilities
  • Environmental impacts are manageable with proper design
  • Technology continues to improve

Texas would not be pioneering unproven technology—it would be applying proven solutions at appropriate scale.

Design Alternatives

Buffered Network vs. Linear Design

Two fundamental approaches to pipeline architecture:

Buffered Network Design (Recommended):

The Texas Water Backbone uses a buffered network architecture—5 hydraulically independent segments connected by ASR (Aquifer Storage and Recovery) buffers:

SegmentRouteASR Buffer
1Gulf Coast → Victoria75,000 AF
2Victoria → Gonzales100,000 AF
3Gonzales → Austin area75,000 AF
4Austin → Waco/Temple50,000 AF
5Waco → DFW60,000 AF

Why this design is superior:

  • 99.95% reliability vs. 99.5% for linear (only 4 hours offline/year vs. 44)
  • 72% energy savings at baseline capacity—water “rests” in buffers rather than maintaining continuous velocity
  • No single-point failures—any segment can be maintained without interrupting the others
  • Modular expansion—add new segments or increase buffer capacity without disrupting operations
  • 24% lower 50-year operating costs despite 11% higher initial capital

Linear Design (Not Recommended):

  • Single continuous pipeline requiring constant water velocity
  • Lower initial capital cost ($11.15B vs. $12.4B)
  • But higher lifecycle cost due to energy requirements and maintenance disruptions
  • Single-point failure vulnerability—any problem stops the entire system
  • Less operational flexibility for maintenance and expansion
Key insight: The buffered network costs more upfront but saves $950M in operating costs over 50 years while dramatically improving reliability and flexibility.

Single vs. Dual Pipeline

ConfigurationProsCons
Single 96"Lower costMaintenance disrupts supply
Dual 96"Redundancy, higher capacityHigher initial cost

The dual pipeline configuration provides operational flexibility and higher total capacity, justifying the additional investment.