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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 52 (2002), Pages 455-468

Northern Segment of the Edwards Aquifer, Texas: Groundwater Availability Modeling

Jones, Ian C.

ABSTRACT

The northern Edwards aquifer is an important source of municipal water. This aquifer is composed of Cretaceous limestone that occurs along the Balcones Fault Zone and extends north from the Colorado River. Regional groundwater flow is influenced by stratigraphy and by fracture orientation, especially in the south where fractures are more abundant. High well yields are associated with fractures and karstified collapse zones. Recharge, in the form of infiltration through fractures, sinkholes and other karst features, primarily occurs where the Edwards and associated limestones crop out. Along the eastern margin of the outcrop zone, gaining streams occur due to groundwater discharge from major and minor springs associated with faults. Discharge also occurs through springs along the Colorado River and by leakage across overlying confining units.

The Texas Water Development Board is developing a numerical groundwater flow model of the northern segment of the Edwards aquifer. The purpose of this model is to create a tool to evaluate water management strategies and assess present and future groundwater availability under normal and drought conditions. Construction of this model includes compilation of hydrogeologic data, e.g., recharge, stratigraphy and structure, rivers and springs, water levels, aquifer properties, and pumping. The model will be calibrated and verified by simulating historic water levels and flow.


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