Previous PageTable Of ContentsNext Page

Conclusions - State of Water Quality

line

· There was a declining trend in total phosphorus, probably due to the trapping effect of upstream dams and reservoirs.
· The river had a low sensitivity to acid inputs.
· Water hardness was lower than the optimum range for drinking water, but was still quite acceptable.
· Iron and manganese values that exceeded the aquatic life criterion were probably in a particulate form, not biologically available, and would be removed by the drinking water treatment needed to remove turbidity.
· Turbidity values were lower than other natural rivers in the Kootenay area during freshet because of settling in the Kinbasket Lake and Lake Revelstoke reservoirs.
· Columbia River water at Revelstoke must be treated to remove turbidity and disinfected prior to drinking.
· One selenium value exceeded the maximum criterion for aquatic life in 1995. This value was collected in a sample with low suspended sediments, indicating that the selenium was not in a particulate form, and may have been biologically available. The Bethlehem Resources Corporation's zinc mine in the Goldstream River Valley (now closed) may have been a source of the selenium.
· Water temperature met the criteria for aquatic life and drinking water aesthetics, but was too cold for water-contact recreation(e.g., swimming).
· One zinc value exceeded the maximum criterion for aquatic life (algae) in 1991. This value was collected in a sample with low suspended sediments, indicating that the zinc was not in a particulate form, and may have been biologically available.

Previous PageTable Of ContentsNext Page