Regulation and Development in the Edwards Aquifer Zone

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Presentation transcript:

Regulation and Development in the Edwards Aquifer Zone Abby M. Pfeiffer November 17, 2016

Agenda Edwards Aquifer Overview Regulatory Background Land Cover Changes Population Growth Discharge and Recharge Data Water Efficiency Measures Questions

The Edwards Aquifer Naturally recharging karst aquifer Very important regional water resource In San Antonio and surrounding towns, it provides water for Agricultural irrigation Industrial use Municipal drinking supply for >2 million people Contributing (Drainage) Zone Runoff and streams collect to flow into aquifer Recharge Zone Where the aquifer outcrop is at the surface Artesian Zone Areas where natural spring flow discharge occurs

Edwards Aquifer Regulation 1959: Edwards Underground Water District, worked to create maps and assist with licensing 1970s: Texas Water Quality Board started to study issues regarding recharge & contamination 1993: Edwards Aquifer Authority established as regulatory body, crosses county jurisdictions TCEQ requires special permits to construct in the recharge zone Legislative Regulations: Subchapter E: Spill Reporting Subchapter F: Regulated Substances Registration, Storage, and Planning Subchapter G: Above and Underground Storage Tank Subchapter H: Prohibitions on Coal Tar

Land cover Changes 9.4% increase in developed land cover 2001-2011 Further steps: Compare with 1992 NCLD Do analysis of just area over recharge zone

Population Growth San Antonio has seen very substantial population growth recently Bexar County Population: 1980: 988,800 1990: 1,185,394 2000: 1,392,931 2010: 1,714,773 2015 (ACS est.): 1,897,753 Further Steps: Get mapped census data for 1990 and 2000

Discharge and Recharge 350K wells, 230K natural springs

Water Efficiency under SAWS San Antonio Water System (SAWS) is the main municipal user of the Aquifer Between 1985 and 2010, the residential population using the Aquifer rose 55.6% while the number of acre feet used annually rose only 15.4% Per person usage has fallen from 225 gallons per person per day in 1982 to only 140 in 2012 Proactive in educating about and incentivizing water conservatoin Free low flow toilets: 19 year program giving away over 250,000 toilets Annual seasonal water restrictions Major conservation PR campaign reaching >100,000 citizens per year in schools and at city events Native landscape and irrigation incentives Tiered water rate structure

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