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New insights into surface-water/groundwater exchanges in the Guadalupe River, Texas, from floating geophysical methods

September 19, 2018

In south-central Texas, the amount of streamflow in the Guadalupe River is a primary concern for local and downstream communities because of municipal, agricultural, wildlife, and recreational uses. Understanding the flow paths and rates of exchange between the surface water in the river and the groundwater in the underlying Carrizo-Wilcox aquifer is vital for understanding the water budget and streamflow variations. In areas where the Guadalupe River crosses the Carrizo-Wilcox aquifer outcrop, the surface-water and groundwater exchanges are not well characterized. Traditional methods to measure these interactions, such as measuring differences in surface-water flows at different locations to infer gains and losses between the locations, are not feasible along this stretch of the Guadalupe River because of upstream dams that cause large daily fluctuations in streamflow. Consequently, the U.S. Geological Survey, in cooperation with the Guadalupe-Blanco River Authority, applied geophysical methods in an exploratory study to identify reaches of the river where streamflow gains and losses (surface-water/groundwater exchanges) might be occurring.

Citation Information

Publication Year 2018
Title New insights into surface-water/groundwater exchanges in the Guadalupe River, Texas, from floating geophysical methods
DOI 10.3133/fs20183057
Authors Scott J. Ikard, J. Ryan Banta, Gregory P. Stanton
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Fact Sheet
Series Number 2018-3057
Index ID fs20183057
Record Source USGS Publications Warehouse
USGS Organization Texas Water Science Center