Abstract

Water samples collected from a newly constructed reservoir and its watershed during a complete salting season indicated the presence of high concentrations of chloride and sodium in the bottom waters of the reservoir at the beginning of thaw periods. This effect occurred despite the fact that water flowing out of the reservoir is normally drawn from very near the bottom. The salt-laden bottom waters were eventually drained from the reservoir as the thaw periods continued, or after freezing temperatures returned. Elevated salt levels returned, however, at the beginning of each successive thaw period.The number and duration of thaw periods and associated rainfall were found to be major influences on the accumulation and behaviour of the salt-laden waters. Factors influencing salt levels in the source streams were analyzed. Salt inputs were shown to be significantly correlated with: the amount of salt applied to streets prior to thaw periods, the degree of urbanization of the watershed, length and type of ro...

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