Proceed to GeoCommunity Home Page

SpatialNewsGIS Data DepotGeoImaging ChannelGIS and MappingSoftwareGIS JobsGeoBids-RFPsGeoCommunity MarketplaceGIS Event Listings
HomeLoginAccountsAboutContactAdvertiseSearchFAQsForumsCartFree Newsletter

Sponsored by:

Today's News

Submit News

Feature Articles

Product Reviews


News Affiliates



Email Lists


Editor's Corner

SpatialNews Daily Newswire!
Subscribe now!

Latest Industry Headlines
Orbit GT and Geosense, South Africa, sign Reseller Agreement
TC Technology Announces MIMS 2017
Public-Private Partnership to Open Geodata Access for African Resource Development
CoreLogic Launches SkyMeasure Mobile App for Roofing Industry
TCarta Marine to Introduce Gulf of Mexico Streaming Basemap Service at Esri Petroleum Conference

Latest GeoBids-RFPs
Cartography Training-VA
A & E Services-OR
Remote Sensing-UT
Surveying and Mapping-WA
GPS Locators-MN

Recent Job Opportunities

Recent Discussions
DEM to DTM in Inroads
GZ File
LiDAR-derived DEM
space syntax
DEM data for Israel Press Release

Streamflow and Springflow Data for Comal and San Marcos Rivers, Texas Now Available Online
Printer Friendly versionPrinter Friendly

The Comal and San Marcos Springs, the two largest springs in Texas, provide water for supply and recreational uses, as well as habitat for endangered and threatened species. Understanding the amount of springflow is critical for water resource managers to make daily decisions on balancing multiple water needs, particularly during periods of low flow.

Historically, information on Comal and San Marcos springflow has been difficult to find, and the differences between streamflow and springflow have often been confusing to stakeholders. Now, streamflow and springflow measurements can be found at one location online. The new website also includes an explanation of how springflow is calculated from streamflow, and why the flows might appear to change over time.

“The new USGS website clarifies how the springflow records of Comal and San Marcos Springs are calculated,” said Marcus Gary, a hydrogeologist at the Edwards Aquifer Authority. “This information greatly improves the ability of the EAA and the many stakeholders of the Edwards Aquifer to understand, report and apply the published flow rates from these critical natural resources.”

Springflow cannot always be measured directly at Comal or San Marcos Springs. Instead, the USGS measures streamflow at two gauges located downstream from the spring networks, Comal River at New Braunfels and San Marcos River at San Marcos. Streamflow is made up of springflow and surface-water runoff (from storm events). During non-storm periods, all streamflow at these two gauges comes from springflow. During storm events, the relative contributions of springflow and surface water runoff are estimated by USGS staff. After the storm events, springflow at Comal Springs and San Marcos Springs is recalculated using a computer program following standard springflow separation methods and the previous estimates are updated with the newer values. The computed springflow values are calculated and checked each weekday before being released online.

“This new website provides up-to-date springflow estimates, even during storm events, and helps communicate what those numbers mean,” said USGS supervisory hydrologist Ryan Banta. “To provide the most accurate data, scientists routinely go into the field to verify the streamflow measurements used in the springflow computations.”

For more than 100 years, the USGS has monitored flow in selected streams and rivers in Texas. The information is routinely used for water supply and management, monitoring floods and droughts, bridge and road design, determination of flood risk and for many recreational activities.

Keep up with the latest USGS Texas news by following @USGS_Texas on Twitter. View the USGS Texas Water Dashboard to see more information about current water conditions in Texas.

Sponsored by:

For information
advertising rates
Click Here!

Copyright© 1995-2014 MindSites Group / Privacy Policy

GeoCommunity™, Wireless Developer Network™, GIS Data Depot®, and Spatial News™
including all logos and other service marks
are registered trademarks and trade communities of
MindSites Group