Abstract
ABSTRACT Texas reservoirs were classified into three groups by cluster analysis based upon the following properties of their surface waters: specific conductance, alkalinity, calcium, sulfate, pH, chloride, and sodium (listed in descending order of importance as discriminators). The three groups of reservoirs had a distinct geographic distribution corresponding to a strong east-west gradient of increasing aridity and differences in surface geology. Chemical characteristics of the western reservoirs were most influenced by the dissolution of evaporites formed in the geological past and current arid conditions (median specific conductance = 1817 μS cm−1; median alkalinity = 120 mg CaCO3 L−1). Sulfate and chloride accounted for 87% of the major anions (in equivalent charge concentrations). The second group of reservoirs, located in a wide band through central Texas, were dominated by weathering of limestone bedrock and calcareous soils (median specific conductance = 518 μS cm−1; median alkalinity = 133 mg Ca...
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