Chapter
Apr 26, 2012
Long-Term Reductions in Removal Effectiveness: Lake McCarrons Wetland Treatment System
Publication: Engineering Approaches to Ecosystem Restoration
Abstract
In 1985, the city of Roseville, Minnesota restored an ineffective wetland tributary to 33 hectare (ha) Lake McCarrons. The intent of the project was to treat runoff such that water quality in the lake would visibly improve. The "wetland treatment system" consists of two detention ponds and six low head wetland chambers. Studies documenting short- and long-term effectiveness show that the system now exports as much phosphorus as it receives, and is 20–50% less effective in the removal of most other pollutants than when it was new, and Lake McCarrons does not appear to be improving. Several "improvements" to the system by the city between the two study periods, and system aging are discussed to shed some light on the decline in effectiveness.
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© 1998 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Gary L. Oberts
Senior Environmental Planner, Metropolitan Council, 230 E. 5th Street, St. Paul, MN 55101
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