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San Antonio Springs
San Antonio Springs (also known as the Blue Hole) is a cluster of springs in Bexar County, Texas. These springs provide a large portion of the water for the San Antonio River, which flows from San Antonio to the Gulf of Mexico. The San Pedro Springs also feed into the San Antonio River.
==Geography==
The San Antonio Springs are located about three miles (5 km) north of Downtown San Antonio; most are now on the property of the University of the Incarnate Word in the Midtown Brackenridge district of San Antonio. The springs are fed by water from the Edwards Aquifer; this water reaches the surface through faults along the Balcones Escarpment. There have been more than 100 individual springs identified, but many of these are no longer active due to pumping demands on the Edwards Aquifer and sedimentation from the upstream Olmos Creek. During periods of drought, the springs sometimes stop flowing entirely, only to resume when water levels rise in the aquifer. The mean flow from the springs is 20 ft³/s (0.6 m³/s).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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