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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions, 2012
Pages 423-431

Gain-Loss Studies in the Colorado River Basin of Texas: Drought of 2011–2012 Update

Geoffrey P. Saunders

Abstract

The Highland Lakes consist of two large storage reservoirs and four smaller pass-through lakes in the Texas Hill Country used as a system to supply Previous HitwaterNext Hit to the lower Colorado River, which is a gaining stream from Austin, Texas to the Gulf Coast. The drought of 2011–2012 in Texas has put a focus on groundwater–surface Previous HitwaterNext Hit interactions. In this study, multiple approaches were used to estimate groundwater contribution to the Highland Lakes and Colorado River of Texas. These approaches included gain-loss field studies, hydrograph separation analyses, gauge flow differential analyses, and mass balance accounting. In addition, information from hydrogeologic studies and groundwater Previous HitavailabilityNext Hit models were used to support estimates of stream flow gains from groundwater contribution. The sources of groundwater contribution were identified as major and minor aquifers intercepted by the Colorado River, and less-recognized formations that drain into and contribute to the river system. These sources impart a component of base flow to a highly regulated, regional Previous HitwaterTop supply operation.


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