![]() The Trinity is a group of geologic deposits divided up into severalĭistinct formations, and each formations is in turn comprised of several layersĬalled members. There are actually several aquifers that make up ( Mace, 2000). An analysis in 2011 concluded that interformational flow is very difficult to characterize and measure, but it is probably more than suggested by Mace ( Green, 2011). Perhaps as much as 360,000 acre-feet per year enters the Edwards from the Trinity.Ī study in 2000 suggested this figure, which amounts to more than half ofĮdwards recharge, is probably too high, and placed the value at 59,000 acre-feet Model built by Eve Kuniansky and Kelly Holligan in 1994 suggested that ![]() Trinity underlies the Edwards, by upwelling. To the Edwards can occur where the layers are juxtaposed by faults or, where the Water also moves through the Trinity much more slowly than through theĬontributes a significant amount of water as recharge for the Edwards. Of water that falls as rain over the area ends up recharging the Aquifer, and Unlike the Edwards, the Trinity Aquifer recharges very slowly. There is also growing evidence that hydraulic connections between the Edwards and the Trininity aquifers are more significant than previously believed, and this may eventually have additional implications for Trinity Aquifer use and management. Up in Edwards Aquifer issues, especially with regard to restrictions onĭevelopment or discharges that could affect the quality of water that eventuallyĮnds up as Edwards recharge. So even though users in the Hill Country use a different aquifer they are caught At the same time, all of Bandera, most of KerrĪnd Kendall, and large parts of Comal and Bexar counties serve as drainage or Most users in northern Bexar, Bandera, Kendall, Comal, and KerrĬounties get their water from the Trinity. Together, they are the primary water source for most of the HillĬountry. Medina counties, and the Trinity-Edwards Plateau Aquifer covers all or part of over 20 counties from Gillespie to the trans-Pecos region of west Texas. ![]() The Trinity Aquifer extends in a band through theĬentral part of the State from the Red River to the eastern edge of Bandera and
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