The Hill Country Priority Groundwater Management Area (PGMA) was designated in 1990 in response to existing and projected groundwater availability issues within the Trinity aquifers. Anecdotal reports suggest current groundwater availability issues in the Southwestern Travis County (SWTC) portion of the PGMA. In the absence of a groundwater conservation district, the…

In 2015, the Barton Springs/Edwards Aquifer Conservation District (District) annexed the eastern portion of Hays County coincident with the Edwards Aquifer Authority boundary to extend groundwater protection and management to the previously unregulated Trinity and other non-Edwards aquifers. To estimate Trinity Aquifer pumpage, first the number of Trinity Aquifer wells…

The Barton Springs segment of the Edwards Aquifer is an important resource for the region and understanding how the aquifer functions is critical to the conservation and preservation of the resource. Groundwater tracing is an important tool used to characterize the recharge areas, flow paths, groundwater velocities, dispersion, and fate…

The Blanco River watershed spans five counties through the Texas Hill Country and supplies water to some of the fastest growing population centers in Texas, if not the country (Figure ES – 1). Over this reach, the Blanco River is both fed by and feeds the Trinity and Edwards aquifers,…

Jacob’s Well is a karst spring originating from the Lower Cretaceous, Middle Trinity Aquifer and is located in the Cypress Creek watershed near Wimberley, Texas. The Middle Trinity Aquifer is the primary groundwater resource for water supply in the region. Jacob’s Well flow responds to climatic variations of both short-…

The Middle Trinity Aquifer is the primary groundwater resource for the central and western portions of Hays County. Groundwater levels and potentiometric surface maps provide critical information about the hydrologic relationships of recharge, discharge, and storage within an aquifer, and the direction of groundwater flow. This report provides a potentiometric…

Geologic data are used by hydrogeologists to develop a better understanding of aquifers. Geophysical logs, driller’s and cuttings logs, and outcrops provide valuable information about aquifer characteristics and can be used in combination with other geologic data to characterize groundwater resources. The purpose of this project was to build a…

Trinity Aquifers are very important groundwater resources in central Texas. However, they show signs of hydrologic stress and depletion in some areas. This study focused on detailed stratigraphic evaluations to better understand hydrologic variations in the Trinity Aquifer system. The study consisted of seven wells located throughout the Western Travis…

Understanding of geologic structure, lithology, and spatial distribution of geologic units that act as barriers to flow (aquitards) is critical for delineating groundwater movement and recharge in karst aquifers. In western Hays County, Texas, the Upper Glen Rose Member of the Trinity Group accounts for most of the surface outcrop…

A groundwater trace performed in the fall of 2017 verified the connection to Barton Springs from three sites: Crooked Oak Cave on Onion Creek, Fenceline Sink on Little Bear Creek, and Stoneledge Quarry adjacent to Little Bear Creek. Groundwater tracer arrived at Main Barton Spring in 5.4 days from Crooked…