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San Antonio, TX, United States

The San Antonio Water System is the largest drinking water and sewage utility in Bexar County, Texas, USA. Based in the Midtown Brackenridge district of San Antonio, SAWS draws water from the Edwards Aquifer to service its customers in all 8 counties of the Greater San Antonio metropolitan area. It is owned by the City of San Antonio. Wikipedia.

Anderson E.,Freese and Nichols Inc. | Reich S.,San Antonio Water System
Pipelines 2015: Recent Advances in Underground Pipeline Engineering and Construction - Proceedings of the Pipelines 2015 Conference | Year: 2015

Over the last several decades, San Antonio has experienced rapid population growth. The San Antonio Water System (SAWS) currently serves more than 1.6 million people in Bexar County Texas as well as parts of Medina and Atascosa Counties, and has over 460,000 water customers. With the integration of the Bexar Metropolitan Water District, regulatory withdrawal limitations, and increasing drought restrictions that have put a strain on the Edwards Aquifer, SAWS has had to increase its water supply and system flexibility. SAWS has been working to meet the increased water demand through a strategy of conservation, reuse, and investments in new water supply resources, and will increase system flexibility with the Water Resources Integration Plan (WRIP). Currently, the Twin Oaks Aquifer Storage and Recovery (ASR) facility in South Bexar County allows SAWS to store excess Edwards Aquifer water from the east side of San Antonio. That water can then be recovered from the ASR during periods of high demand, significantly increasing SAWS operational flexibility. The ASR Pipeline, completed in 2004, is currently the only conduit between the ASR and SAWS' distribution system; moving water into the distribution system during production mode and reversing flow to inject water into the ASR well field in recharge mode. Since future water supply facilities will produce a constant base flow, additional flexibility is needed for continued recharge of the ASR. The WRIP will provide that flexibility. The WRIP consists of approximately 45 miles of 48" to 60" diameter steel pipe and two associated pump stations, extending from the ASR to west San Antonio. The WRIP will be constructed in two phases and will ultimately convey up to 75 MGD of potable water from four different sources: treated water from the Brackish Groundwater Desalination Facility (Wilcox Aquifer), Local and Expanded Carrizo Wells (Carrizo Aquifer), and recovered ASR water (Edwards Aquifer). Similar to the ASR pipeline, the WRIP pipeline will also be used to recharge the ASR well field using reverse gravity flow. The WRIP pipeline will work in tandem with the ASR pipeline to offer operational flexibility and provide water where San Antonio needs it most. This paper will describe the WRIP and specifically discuss design concepts that allow the WRIP to give SAWS additional flexibility in managing their water supply. © 2015 ASCE. Source

Bennett D.,Freese and Nichols Inc. | Reich S.,San Antonio Water System
Pipelines 2014: From Underground to the Forefront of Innovation and Sustainability - Proceedings of the Pipelines 2014 Conference | Year: 2014

The San Antonio Water System (SAWS) serves more than 1.6 million people and more than 465,000 water customers in the greater San Antonio area and surrounding counties. Over the last several decades San Antonio has experienced rapid population growth, the integration of the Bexar Metropolitan Water District, regulatory withdrawal limitations, and increasing drought restrictions that have put a strain on the Edwards Aquifer, San Antonio's primary water supply. SAWS has been working to meet the increased water demand through a strategy of conservation, reuse, and investments in new water supply resources. The Regional Carrizo Program (RCP) is a water supply project that was developed through a cooperative regional partnership with the Gonzales County Underground Water Conservation District, the Schertz-Seguin Local Government Corporation (SSLGC), and the Gonzales County Water Supply Corporation. Through this unique partnership, the project will convey up to 12,688 acre-ft of Carrizo Aquifer groundwater to Bexar County, which represents the largest non-Edwards water supply in SAWS' history. This paper will focus on the planning, design, and construction for one of the most challenging components of the RCP: fast-track design and construction of the 11.5 mile, 36-in. diameter water delivery pipeline (WDP). The WDP will transmit water beginning in the City of Schertz and traverse through three counties and four cities, terminating at an existing SAWS pump station on the northeast side of San Antonio. Challenges faced during the planning phase included route selection through urban residential and industrial areas, future road expansions, drainage channels, new land developments, and numerous utilities. Unique design elements included provisions for construction of a pipeline within drainage channels; acquisition of easements from more than 60 landowners; and multilevel coordination with counties, cities, state agencies, and utility owners. Construction challenges included urban construction, extensive bore/tunnel crossings, two interstate highway crossings, railroad crossing, unforeseen utility conflicts, new development, a major creek crossing, expedited submittal reviews, coordination of pipeline tie-ins and testing, interior inspection of 11.5 miles of 36-in. steel pipeline, and oversight of multiple installation crews to meet the program schedule. © 2014 American Society of Civil Engineers. Source

Stein B.,LBG Guyton Inc. | Morrison K.,San Antonio Water System | Beach J.,LBG Guyton Inc.
AMTA/AWWA Membrane Technology Conference and Exposition 2013 | Year: 2013

In order to diversify their water supplies, SAWS has inaugurated a brackish desalination project to supply over 10 MGD initially to later be expanded to 25 MGD of treated potable water to the City of San Antonio. The first phase will have thirteen production wells completed into the lower Wilcox Sands at depths from 1,200 to 1,800 feet. The brackish water will be pumped through pipelines into a centralized plant located near SAWS current ASR facility. The brackish water from the Wilcox has a TDS of about 1,400 mg/l that will be treated by RO prior to piping to the City. About 1.2 MGD of concentrate from the treatment plant, which has a TDS of about 15,000 mg/l, will be disposed of in three 5,000-foot deep injection wells completed into the Edwards Limestone. © 2013 American Water Works Association. Source

Davis B.,Water Business of Black and Veatch | Harrah E.,San Antonio Water System | Timmermann D.,Black and Veatchs Water Business
Journal - American Water Works Association | Year: 2015

A strategy of long-term planning, conservation, and diversification of supply sources, including recycled water delivered programmatically is helping the San Antonio Water System (SAWS) to satisfy the area's thirst for safe drinking water in a state blessed by sunshine and natural gas but plagued by drought. Construction of the Twin Oaks Brackish Groundwater Desalination (BGD) Program will help SAWS further diversify the utility's water portfolio. Facilities will also be built to support operations, laboratory, public interaction, and research functions. The conceptual design for the BGD program includes the implementation of a new, 30-mgd brackish groundwater supply to be constructed in three phases, with the initial 12-mgd capacity commissioned by October 2016. Source

Sanchez-Flores R.,Texas A&M University | Conner A.,San Antonio Water System | Kaiser R.A.,Texas A&M University
International Journal of Water Resources Development | Year: 2016

Water scarcity, climate change, population growth and rising infrastructure costs have opened the door for unconventional or ‘new’ water sources. Reclaimed water reuse has historically been practised for potable use in the United States as de facto water reuse or unplanned indirect water reuse. The increasing number of planned indirect water reuse projects in the country and the approval of the first direct potable reuse projects have exposed the limitations of the regulatory system at the national and state levels. These limitations pose barriers and/or add uncertainty to the viability of potable water reuse. © 2016 Taylor & Francis Source

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