Editing Barton Springs (section)

===Main spring===
Main Barton Spring/Parthenia is the most famous, yet least visible of the four springs because it is completely submerged by pool water.  Located near the diving board in [[Barton Springs Pool]], the spring's flow is not always visible at the surface.

The main spring discharges an average flow of about {{convert|31|e6USgal|m3}} per day.  The lowest discharge ever recorded was {{convert|9|e6USgal|m3}} per day during the [[1950s Texas drought|drought of the 1950s]], and the highest discharge ever recorded was {{convert|85|e6USgal|m3}} per day during December 1991<ref>{{cite web | url=https://waterdata.usgs.gov/monitoring-location/08155500/#parameterCode=00060&startDT=1991-12-01&endDT=1992-03-31 | title=Barton SPGS at Austin, TX }}</ref> and September 2016<ref>{{cite web | url=https://waterdata.usgs.gov/monitoring-location/08155500/#parameterCode=00060&startDT=2016-07-01&endDT=2016-10-30 | title=Barton SPGS at Austin, TX }}</ref> flooding.  By comparison, a typical domestic in-ground swimming pool holds about {{convert|20,000|USgal|m3}}, and the City of Austin, a city of about 1 million residents, uses about {{convert|120|e6USgal|m3}} per day for its public water supply system.<ref>{{cite web |title=Austin Water Use at Record Low |url=http://www.hillcountryalliance.org/austin-water-use-at-record-low/ |website=Hill Country Alliance |access-date=11 July 2020}}</ref>