Overview
The Texas Water Backbone is a transformative infrastructure project that provides drought-proof water supply without taking a drop from East Texas rivers or aquifers.
Key specifications:
| Parameter | Value |
|---|---|
| Pipeline Length | 420 miles |
| Pipeline Diameter | 96 inches (dual) |
| Design Capacity | 500,000 AF/year |
| ASR Storage | 360,000 AF buffer |
| Primary Source | Gulf Coast seawater desalination |
| Secondary Sources | Brackish groundwater (inland) |
Pipeline Infrastructure
The backbone uses a buffered network architecture—5 hydraulically independent segments connected by ASR storage buffers, rather than a single continuous pipeline.
The 5-Segment Design
| Segment | Route | Distance | ASR Buffer |
|---|---|---|---|
| 1 | Gulf Coast (Freeport) → Victoria | 80 miles | 75,000 AF |
| 2 | Victoria → Gonzales/Carrizo | 100 miles | 100,000 AF |
| 3 | Gonzales → Austin/Highland Lakes | 90 miles | 75,000 AF |
| 4 | Austin → Waco/Temple | 80 miles | 50,000 AF |
| 5 | Waco → DFW Terminus | 70 miles | 60,000 AF |
Why buffered segments?
Each ASR buffer acts as a hydraulic decoupling point. Water “rests” in underground storage between segments rather than flowing continuously at high velocity. This provides:
- Energy efficiency: 72% lower pumping costs—each segment operates at optimal velocity
- Reliability: 99.95% uptime—any segment can be maintained while others continue operating
- Flexibility: Buffers absorb demand fluctuations and supply variations
- Resilience: No single-point failures can disable the entire system
Pipeline specifications:
- 96-inch dual pipeline within each segment
- Material: Prestressed concrete cylinder pipe (PCCP)
- Optimal flow velocity: 4.0-5.5 fps per segment (vs. 5.5-8.0 fps required for linear design)
- Designed for 100-year operational life
Water Sources
Primary: Seawater Desalination
Gulf Coast desalination facilities produce high-quality drinking water from an unlimited source—the ocean.
- Proven technology: Tampa Bay, San Diego, and facilities worldwide demonstrate reliability
- Drought-proof: Ocean water doesn’t depend on rainfall
- Scalable: Capacity can expand with demand
Secondary: Brackish Groundwater
Texas has over 4.5 billion acre-feet of brackish groundwater—water too salty for drinking but easily treated.
The backbone is designed as a multi-source collection system with connection stubs and infrastructure enabling inland desalination plants to contribute:
| Metric | Seawater Only | With Brackish |
|---|---|---|
| Total Capacity | 500,000 AF/yr | 734,000 AF/yr |
| Average Cost | $1,400/AF | $1,170/AF |
| Supply Resilience | Good | Excellent |
ASR Storage
Aquifer Storage and Recovery (ASR) is the foundation of the buffered network design, providing 360,000 AF of distributed storage:
- Victoria buffer (75,000 AF): First collection point after Gulf Coast production
- Gonzales/Carrizo buffer (100,000 AF): Largest buffer, taps into Carrizo-Wilcox aquifer
- Austin/Highland Lakes buffer (75,000 AF): Central Texas hub
- Waco/Temple buffer (50,000 AF): North-central staging
- DFW terminus buffer (60,000 AF): Final delivery storage
How it works:
- Water is pumped into suitable aquifer formations during low-demand periods
- Retrieved during peak demand or supply disruptions
- Each buffer provides 30-90 days of local supply independence
- Enables segment-by-segment maintenance without service interruption
Multi-Use Corridor
The pipeline corridor serves multiple infrastructure needs:
- HVDC Transmission: High-voltage lines connecting coastal wind/solar to urban load centers
- Fiber Optic: Telecommunications backbone for rural connectivity
- Brine Collector Pipeline: Parallel pipeline transporting desalination concentrate from inland brackish facilities back to the coast for valorization
- Revenue streams: Corridor leases and brine transport fees offset water transmission costs
The brine collector runs parallel to the water main but flows in the opposite direction—enabling inland brackish desalination by eliminating the disposal barrier. Coastal processors purchase the concentrate as industrial feedstock (salt, chlorine, magnesium), turning what would be waste into product.
This multi-use approach maximizes the value of the right-of-way investment.