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Supply and Demand Scenarios

Recommendations

Addendum by SAWS Board

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Original 1998 Water Resource Plan

he Task Force developed two scenarios to be used in planning for future water supply requirements: Planning Scenario 1 and Planning Scenario 2.

In Planning Scenario 1 (PS1), SAWS serves a geographic area that is not much greater than its existing service area. PS1 includes the current SAWS service area; and the cities of Alamo Heights, Elmendorf, Kirby, Leon Valley and Shavano Park.

In Planning Scenario 2 (PS2), SAWS serves as the regional wholesale water provider for all of the service areas and entities included in Planning Scenario 1; in addition to Atascosa Water Supply Corporation, Bexar Metropolitan Water District, and East Central Water Supply Corporation; the cities of Converse, Fair Oaks Ranch, Live Oak, Selma, and Windcrest; and portions of Comal, Kendall and Medina Counties. PS2 allows for regional planning and implementation, taking in the entire City of San Antonio Extraterritorial Jurisdiction in the northwestern portion of the County.

Assuming that the local Aquifer Storage and Recovery (ASR) project is used as a supply reserve, under PS1, SAWS current supplies during a critical drought period exceed demand in 2006 and 2007. Beginning in 2008, demand exceeds existing supply during a critical drought period, resulting in a shortfall that will grow from 4,786 acre-feet in 2008 to over 71,045 acre-feet in 2050. This shortfall necessitates that additional supplies be identified and implemented to meet future demand.

If regional communities and City Council elect SAWS to become the regional wholesale water provider, SAWS will accommodate growth outside its existing service area. The cost to develop additional water supplies for the region will be shared with regional communities and other water providers. In this scenario (PS2), the ASR will be used as a supply reserve; and the difference between existing supplies and future demand during a critical drought period grows from 6,282 acre-feet in 2006 to more than 124,896 acre-feet in 2050.