NEWS NOTES ON SUSTAINABLE WATER RESOURCES  Edwards Aquifer  https://en.wikipedia.org/wiki/Edwards_Aquifer  Located in South Centr...

NEWS NOTES ON SUSTAINABLE WATER RESOURCES  Edwards Aquifer  https://en.wikipedia.org/wiki/Edwards_Aquifer  Located in South Central Texas, the Edwards Aquifer incorporates an area of approximately 4,350 square miles that extends into parts of 11 counties. The aquifer's boundaries begin at the groundwater divide in Kinney County, East of Brackettville, and extend Eastward through the San Antonio area and then Northeast where the aquifer boundary ends at the Leon River in Bell County. The aquifer is hydrologically separated into the Austin and San Antonio regions by a groundwater divide near the town of Kyle in Hays County.The total area of the aquifer forms roughly the shape of a slight upward curve and approximately measures 160 miles east to west at its furthermost boundaries and 80 miles north to south at its widest section. The aquifer is geographically divided into three distinct regions: the total drainage area, recharge zone, and artesian zone. These zones run east to west, with the drainage area forming the northernmost portion of the aquifer and the artesian zone forming the southernmost portion. The aquifer's recharge zone, where surface water enters the aquifer, follows the Balcones Fault line, from Brackettville (roughly along U.S. Highway 90), through San Antonio, and north to Austin along but a few miles west of Interstate 35. On certain stretches of highway in Austin and San Antonio, signs indicate that the driver is entering or leaving the recharge zone, as the zone's easternmost edge sits beneath heavy urban and suburban development. Its drainage area, where water is transported near the surface to the recharge zone, extends about 40 miles (64 km) north of the recharge zone at the west end, and tapers to end at a point in the east. The artesian zone, where water springs from wells naturally due to the higher elevation of the recharge zone, extends 10–20 miles (16–32 km) south on the west end to only a few miles south on the east end. Across the eastern half of the aquifer, the recharge and artesian zones occupy common area. A recent report on the aquifer is the following:  http://nap.edu/25200/    National Academies of Sciences, Engineering, and Medicine. 2018. Review of the Edwards Aquifer Habitat Conservation Plan: Report 3 . Washington, DC: The National Academies Press. https://doi.org/10.17226/25200.  This information will also be linked on the 2018 Reports Page 02 of the Sustainable Water Resources Site at https://sites.google.com/site/sustainablewaterresources/  Tim SmithGovernment Web Site, https://acwi.gov/Sustainable Water Resources Site, https://sites.google.com/site/sustainablewaterresources/