The Edwards Aquifer is one of the most prolific artesian aquifers in the world. Located on the eastern edge of Edwards Plateau in the U.S. state of Texas, it discharges about 900,000 acre feet (1.1 km3) of water a year and directly serves about two million people. The Edwards Aquifer is also home to several unique and endangered species.
... The Aquifer has a recharge zone of 1,250 square miles (3,200 km2) ... Most of the water (75%-80%) that is in the Aquifer originated from some of the creeks and rivers flowing in the area ... Two creeks that flow into the Aquifer are the Cibolo and Helotes Creeks ...
... Today, SOS works with groups in the larger Edwards Region with a collective goal of conserving the Greater Edwards Aquifer Ecosystem, which is now chartered in the "Edwards Aquifer Protection Plan." The Edwards ... these creeks to travel underground to the Aquifer ... Because limestone provides no natural filtering system (unlike sandstone aquifers) it is more susceptible to pollutants in the creeks ...
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—Blake Edwards (b. 1922)