Lake Washington Case Study

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how L. Washington is an example of direct impacts of cultural eutrophication

  • sewage effluent was discharged directly into lake

  • this caused a large increase in phosphorus loading

  • productivity increased far faster than natural eutrophication

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biological community shift of L. Washington

  • phytoplankton increased, zooplankton decreased

  • reduced water clarity

  • more frequent blooms

  • greater oxygen demand at depth

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how L. Washington applies to other lakes

  • phosphorus is the key drive of freshwater eutrophication

  • nutrient reduction can lead to measurable recovery

  • point source nutrient inputs can rapidly degrade lakes

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size of L. Washington

second biggest in washington state