Abstract

Summary Regional acidification of surface waters is occurring in south-western Australia that is coupled with dryland salinity and acidity carried by rising groundwater. We report on basin-scale influences of acidic saline groundwater discharge on surface water chemistry in the Swan-Avon Basin investigated through 7 years of annual base-flow and lake water quality snapshots. This is linked with analysis of temporal hydrochemistry and discharge at two sites in the basin to assess historic patterns. At least 350 km of major waterways and tributaries in the Swan-Avon Basin were found to exhibit base-flow acidity (pH

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