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Phosphorus Management Activity
Try Managing A Lake

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Michigan Environmental Education Curriculum
Water Quality - Pollutant Sources and Impacts

A lake receives 3000 metric tons of phosphorus per year, half from point sources and half from nonpoint sources. The phosphorus has led to a lot of algae growth and the Secchi disk transparency is less than 1m. Our goal is to increase the Secchi disk reading to 3m, a good depth for recreational use.

To manage the lake, reduce the point and nonpoint phosphorus loads until the transparency goal is met. There are several combinations which will do this, but there is a ‘best’ answer – the combination that meets the goal at the lowest cost.

Alt | Win

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