Posts

Regional Conveyance Study-Colorado River Aqueduct-RCS-primary-June 2020

Draft Study Highlights Region’s Water Conveyance Options

/in , /by

A draft report released today by the San Diego County Water Authority shows that building a new conveyance system to transport regional water supplies from the Colorado River Quantification Settlement Agreement is cost-competitive with other long-term options for meeting the region’s water needs.

The draft Phase A report is under review by water officials across the region. The Water Authority’s Board of Directors is expected to decide whether to move to Phase B at its July 23 meeting.

“By releasing this draft report – along with an independent review of key financial assumptions – we are trying to spark a thoughtful dialogue about our region’s water future,” said Dan Denham, deputy general manager for the Water Authority. “Given the long lead time for major water infrastructure projects, it’s important that San Diego County wrestle with these complex questions today so we can control our own destiny tomorrow.”

The Phase A report is the result of technical and cost analysis by Black & Veatch Corp. and the economic analysis by Water Authority staff. The engineering firm conducted similar studies for the Water Authority dating back to 1996, assessing “single use” water-delivery projects in those studies. The current Phase A analysis looks at conveyance projects with multiple partnership possibilities and potential benefits for the environment, water agencies and others.

Two viable alternatives emerge

Three potential pipeline routes were studied in Phase A, and the draft report says two alternatives (3A and 5A) are cost-competitive with other options, such as relying more on Metropolitan Water District of Southern California or developing additional local supplies.

Phase A takes a conservative approach to cost protections, by not factoring in potential partnerships or other sources of funds. However, partnerships and other agreements could significantly reduce the cost and enhance the value of a regional conveyance system. Phase B would include more detailed analysis of potential partnerships and funding opportunities and more details about projected costs from MWD.

“A decision about the Regional Conveyance System cannot be made in the abstract,” said Kelly Rodgers, director of the Water Authority’s Colorado River Program. “It must be made based on a comparison of the available alternatives, and we look forward to additional analysis and perspectives from our member agencies in the weeks ahead.”

The Water Authority currently pays MWD to transport QSA water through the Colorado River Aqueduct to San Diego. The regional conveyance system would be designed to convey the QSA water, which in 2021 will reach its full amount of 280,000 acre-feet of water annually. The current Water Transfer Agreement between the Imperial Irrigation District and the Water Authority continues to 2047. Both agencies can agree to extend the transfer another 30 years to 2077.

Conveyance routes would connect to All-American Canal

Each of the potential conveyance routes would connect to the tail end of the All-American Canal where it meets the Westside Main Canal in the southwest corner of Imperial Valley.

Two of the routes would follow a southern corridor between the Imperial Valley and San Diego, with one route over the mountains paralleling the U.S./Mexico border and the other tunneling through the mountains. Both routes would end at the San Vicente Reservoir in Lakeside.

The third and northernmost route would follow the Westside Main Canal toward the Salton Sea, then flow past Borrego Springs, and through the mountains. It would eventually connect to the Water Authority’s Twin Oaks Valley Water Treatment Plant in San Marcos.

Draft report findings

  • The region will continue to need QSA water through 2112.
  • All three RCS alternatives are viable from a technical and engineering perspective.
  • Alternatives 3A and 5A are economically competitive and provide long-term reliability and low-cost water to the region.
  • Alternative 5C is not economically competitive with Alternatives 3A and 5A and will not be recommended for further study.
  • Alternatives 3A and 5A could be integrated without major changes to current Water Authority operations.
  • Potential multi-agency, multi-use partnerships and other agreements could significantly reduce the cost and enhance the value of each RCS alternative and provide regional benefits to San Diego, California and the Southwest.

To read the report, go to https://www.sdcwa.org/colorado-river-supplies-management.

All-American Canal

Study to Explore New Regional Water Conveyance System

/in , /by

The San Diego County Water Authority’s Board of Directors last week approved a contract to study the viability of a new regional water conveyance system that would deliver water from the Colorado River to San Diego County and provide multiple benefits across the Southwest.

The $1.9 million contract was awarded to Black & Veatch Corporation for a two-phase study. The engineering firm conducted similar studies for the Water Authority dating back to 1996 but looked at “single use” in those studies.

“A regional system to move our independent Colorado River supplies from the Imperial Valley directly to San Diego County could be more cost-effective, while also providing multiple benefits for California and the Southwest,” said Kelly Rodgers, director of the Water Authority’s Colorado River Program. “The study will assess the potential for new regional and public-private partnerships and funding opportunities.”

Three potential pipeline routes studied

The Water Authority currently pays the Metropolitan Water District of Southern California to transport Quantification Settlement Agreement water through the Colorado River Aqueduct to San Diego.

The pipeline under study would be designed at a capacity to convey the QSA water, which in 2021 will reach its full amount of 280,000 acre-feet of water annually. The current Water Transfer Agreement between the Imperial Irrigation District and the Water Authority continues to 2047. But both agencies can agree to extend the transfer another 30 years to 2077.

Three potential routes for the pipeline will be considered as part of an initial screening of the alternatives during the first phase of the study. The study will also consider elements such as permit and environmental regulations, and risk, cost and economic analysis.

Phase 1 of regional water system study will take one year

The first phase of the study, projected to cost $1.3 million, is expected to be completed in summer 2020. The Board will then determine whether to go forward with phase 2 of the study.

Pending Board approval, the second phase will include the final screening of alternatives based on refinement of site layouts, pipeline alignment and tunneling requirements, and risk, cost and economic analysis. The second phase will cost $590,00 and is expected to take one year to complete.

The Board previously approved funds for this study at its June 27 meeting.

Map indicates three potential routes for a proposed regional pipeline system that would move Quantification Settlement Agreement water directly from the Imperial Valley to San Diego. Two of the routes (the light blue and purple lines) follow a southern route. The third proposed route (shown in both a yellow and darker blue line) follows a northern path. Graphic: Water Authority

Conveyance routes would connect to All-American Canal

As the study gets underway, there are three routes under consideration. Each of those routes would connect to the tail end of the All-American Canal where it meets the Westside Main Canal in the southwest corner of the Imperial Valley.

Two of the routes would follow a southern corridor between the Imperial Valley and San Diego, with one route over the mountains paralleling the U.S./Mexico border and the other tunneling through the mountains. Both routes would end at the San Vicente Reservoir in Lakeside.

The third and northernmost route would follow the Westside Main Canal toward the Salton Sea, then flow past Borrego Springs, and through the mountains. It would eventually connect to the Water Authority’s Twin Oaks Valley Water Treatment Plant in San Marcos.

The pipeline system is one of a handful of visionary ideas being discussed by San Diego County water leaders to enhance partnerships and solutions that make sense locally and more broadly as part of Governor Newsom’s Water Portfolio Program to develop resiliency statewide.

Study To Explore New Regional Water Conveyance System

/in , , /by /Water News Network

The San Diego County Water Authority’s Board of Directors last week approved a contract to study the viability of a new regional water conveyance system that would deliver water from the Colorado River to San Diego County and provide multiple benefits across the Southwest. The $1.9 million contract was awarded to Black & Veatch Corporation for a two-phase study. The engineering firm conducted similar studies for the Water Authority dating back to 1996 but looked at “single use” in those studies.

Full Story