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Conditions Where Applicable

These basins are used (on a relatively short term basis) for the treatment of silted water prior to release to watercourses.

Considerations

• These basins are often most effective when they are constructed so that their length is four times their width.
• The bottoms of settling basins should be lined (e.g. with plastic).
• Settling basins are often most effective when several are used in series.

Implementation Procedures

• A pipe should be installed near the top of a settling basin in such a manner that it discharges water from the top of the water column. There are a number of alternatives to this method of settling basin construction involving the use of various detention devices such as pre-cast manholes, and utilizing natural topographic features.

Settling basin construction details

Settling basin lined with plastic.

Series of rough settling basins intended for short term use.

Maintenance

• It may be necessary to remove and dispose of accumulated sediment from settling basins in order to maintain their operating capacity.

Abandonment

• Settling basins should be filled in and stabilized when no longer required.

This Fact Sheet does not constitute DFO approval; other mitigative strategies may be required.
The proponent is advised to contact all other appropriate regulatory agencies.

For more information contact the nearest
Department of Fisheries and Oceans office.