Edwards Aquifer Urban Hydrology Network

Continuous Monitoring and Water-Quality Interactive Graphics

A combination of continuous monitoring (hydrologic and physicochemical data) and water-quality data from discrete samples provides insight into the complex hydrology of the Edwards aquifer and changes over time.

  • Continuous hydrologic and climate data from select reference sites provides historical data to water-resource managers and scientists to understand long-term trends.
  • Continuous hydrologic and water-quality data from the UHN provides information about hydrologic change in response to storms and droughts, especially for the environmentally sensitive Edwards aquifer recharge zone.
  • Detailed water-quality data collected periodically provides information about specific constituents of concern.
Interact with Continuous Monitoring Data Interact with Water-Quality Data

Reference Sites

J-17 Index Well

The Edwards Aquifer Authority (EAA) measures water levels at the J-17 well which is officially designated as state well number AY-68-37-203. The J-17 water-level record dates to the 1930s and is used as an indicator of regional hydrologic conditions that provides a scientific basis for implementing water-use restrictions.

EAA - Bexar J-17 Index Well Data

Comal Springs

USGS computes discharge from Comal Springs using measurements made in the Comal River located in New Braunfels, Texas. Like the J-17 well, Comal Springs discharge is used as an indicator of regional hydrologic conditions that regulators use as a basis for protecting sensitive plant and animal species that depend on flowing springs.

USGS - Comal Springs at New Braunfels Data

USGS - Comal Springflow Separation

San Antonio Airport Rainfall

The National Oceanic and Atmospheric Administration National Weather Service (NWS) collects weather data from the San Antonio International airport including daily rainfall total. Rainfall data from this location are used as an indicator of general rainfall patterns in San Antonio and Bexar County.

NWS San Antonio Airport (KSAT) rain gage Data

Continuous Monitoring Interactive Graphs

Choose a site and measurement type to view detailed hydrologic data graphs1,2. Site locations can be viewed on the interactive map.

Choose a site and measurement type from the pull-down menus to the left to view detailed hydrologic data graphs.
Choose a site and measurement type from the pull-down menus to the left to view detailed hydrologic data graphs.
Choose a site and measurement type from the pull-down menus to the left to view detailed hydrologic data graphs.
Choose a site and measurement type from the pull-down menus to the left to view detailed hydrologic data graphs.
Choose a site and measurement type from the pull-down menus to the left to view detailed hydrologic data graphs.

1 Recent data may be provisional and subject to revision based on USGS data review. Detailed data is available through the USGS National Water Information System (NWIS) database, linked below for each site.

2 Gage height and water-level data are reported relative to a reference datum. Data from sites which use different reference datum should be converted to the same reference datum before making direct comparisons.

Detailed Water-Quality Data

Select site to view detailed water-quality data. Site locations can be viewed on the interactive map.

Site Name Graphs Data Source
Comal 1 Water Quality NWIS
Donella Well Water Quality NWIS
Frio River Water Quality NWIS
Helotes Creek Water Quality NWIS
Leon Creek Water Quality NWIS
Parkwood Well Water Quality NWIS
Salado Creek Water Quality NWIS
Seco Creek Well Water Quality NWIS
Shavano Park Well Water Quality NWIS
West Elm Creek Water Quality NWIS
Western Oak Well Water Quality NWIS
Zarzamora Well Water Quality NWIS