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The Impact of Impervious Surfaces on Water Quality in Duluth Watersheds

This study examines the relationship between impervious surfaces and water quality across Duluth's watersheds, specifically Amity, Tischer, Chester, and Miller. Aerial photos reveal varying levels of imperviousness, highlighting urban, rural, and forested land uses. Findings indicate that as imperviousness increases, water quality declines. The data is vital for urban planning and conservation efforts, illustrating the need for better zoning practices to mitigate environmental degradation. Understanding these dynamics is crucial for promoting sustainable development in the region.

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The Impact of Impervious Surfaces on Water Quality in Duluth Watersheds

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  1. Duluth Watersheds Amity Tischer Chester Miller

  2. Aerial Photos

  3. Impervious Surfaces

  4. Impervious Surface is a Strong Indicator of Water Quality Relationship Between % Imperviousness and Water Quality 80 70 60 50 40 30 20 10 0 WATERSHED IMPERVIOUSNESS (%) DEGRADED IMPACTED PROTECTED STREAM DEGRADATION ADAPTED FROM SCHUELER, ET. AL., 1992

  5. Current Impervious Surfaces by Watershed

  6. Land Use/Cover

  7. NEMO Classes Red – Urban areas, roads and railroads Yellow – Farmsteads and rural developments Green – Forested areas Brown – Grasslands, agricultural, bare rock, gravel pits, regeneration forest Blue – Open water, wetlands

  8. Zoning Boundaries

  9. City of Duluth Land Use/Covercombined with zoning boundaries

  10. Removal of Steep Slopes

  11. Removal of Steep Slopes and Wet areas

  12. Removal of Steep Slopes, Wet areas, and current Impervious areas

  13. Build-out Impervious Surfaces

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