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Effects of Nutrient Enrichment on Rivers and Streams

Effects of Nutrient Enrichment on Rivers and Streams. Ohio EPA 2006. Mandate to Restore Polluted Waters. FEDERAL WATER POLLUTION CONTROL ACT [As Amended Through P.L. 107–303, November 27, 2002]. SEC. 101. (a) The objective of this Act is to restore and maintain

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Effects of Nutrient Enrichment on Rivers and Streams

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  1. Effects of Nutrient Enrichmenton Rivers and Streams Ohio EPA 2006

  2. Mandate to Restore Polluted Waters FEDERAL WATER POLLUTION CONTROL ACT [As Amended Through P.L. 107–303, November 27, 2002] SEC. 101. (a) The objective of this Act is to restore and maintain the chemical, physical, and biological integrity of the Nation’s waters.

  3. 1222 Habitat Alterations 922.1 847.2 932.7 Siltation 547.4 754.2 783.2 Organic Enrichment 762.7 931.2 575.9 Assessment Nutrients 305.6 Cycle 228 2000 537.3 1998 Flow Alteration 313.3 1996 314.8 413.5 Metals 379 226.1 0 200 400 600 800 1000 1200 1400 Miles Impaired By Cause Leading Causes of Impairment2000 Ohio Water Resources Inventory

  4. Effects of Nutrient Enrichment On Streams • Increased Algae Growth • Wide Swings in Dissolved Oxygen • fish need at least 4.0 mg/l • Simplified Biological Communities • fewer types of fish and bugs but more of them • fish kills • Habitat a Strong Modifier • Shading, Assimilative Capacity

  5. Habitat Destruction and Nutrient EnrichmentEffects on Stream Fish Community Degraded Fishery Healthy Fishery

  6. Good Habitat(Shading, Better Nutrient Processing, More Living Places)

  7. Poor Habitat(Full Sunlight, Boom and Bust Production, Fewer Living Spaces)

  8. Historic Range of Smallmouth BassTrautman’s Fishes of Ohio

  9. Viable Smallmouth Bass Fisheries

  10. 2004 2005 USGS ‘05 2006 Basins Nutrient StudySampling Locations2004 & 2005

  11. Findings from Nutrient Study2004 & 2005

  12. D.O. Swings As Related to TP and Canopy

  13. 9/12–14/05 25 20 D.O. mg/l 15 10 5 0 0 2000 4000 6000 8000 Time Gross Nutrient EnrichmentStillwater River

  14. Buffers and Habitat Quality Bank erosion Nothing here to filter pollution

  15. Landuse and Nutrient Enrichment

  16. Little or No Data Background Normal Enriched Polluted Average Phosphorus Concentrations Around Ohio

  17. Stream Quality Very Poor Poor Fair Good Excellent Stream Quality and Density of CAFOs Mercer Auglaize Darke

  18. Managing the Landscape to Manage Nutrient Loads • Streams need wide buffers • provide shading • cooler temperature • limit algae growth • filter pollutants • allow sediment to drop out • vegetation take up nutrients • accidents do happen, need margin of safety • Good Physical Habitat • increase processing of nutrients • where drainage needed, use natural channel designs • Wetlands or Riparian for Tile Drainage • tiles by-pass riparian zone

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