Groundwater/surface water interactions : gravel pit lakes in the Brazos River Alluvium Aquifer.

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Urban expansion and the subsequent need for construction materials are increasing aggregate mining activities in many areas around the world. In central Texas much of the aggregate has come from alluvial sediments in the Brazos River valley which also comprise the Brazos River Alluvium Aquifer. Aggregate mining is exempt from many reclamation requirements and the result is a series of post-mining gravel pit lakes in the Brazos River Alluvium Aquifer exposing the aquifer to surface conditions. This study examines two gravel pit lakes in the Brazos River Alluvium Aquifer to determine if the lakes act as sinks, recharge sites, or flow-through groundwater-fed lakes. Data based on water elevation, specific conductivity, isotopic values, and a two-dimensional finite element model suggest that both lakes are flow-through systems throughout the year.

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Hydrogeology. Geology. Brazos River Alluvium Aquifer.

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