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Urban Water Quality Issues - Introduction to Urban Stormwater


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Charles Humphrey, Jr.

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Urban Water Quality Issues - Introduction to Urban Stormwater

  1. 1. Introduction to Urban Stormwater Charles Humphrey Jr. Area Environmental Agent North Carolina Cooperative Extension
  2. 2. <ul><li>Water Cycle in Open and Urban Areas </li></ul><ul><li>Urban Stormwater Pollutants </li></ul><ul><li>Common Stormwater Best Management Practices </li></ul><ul><li>Summary </li></ul>
  3. 3. Water Cycle Percolation
  4. 4. Water Cycle
  5. 5. Urban Water Cycle
  6. 6. What is a Watershed? (Osmond, 2000)
  7. 7. Intended Uses of Water Resources <ul><li>Swimming </li></ul><ul><li>Boating </li></ul><ul><li>Fishing </li></ul><ul><li>Drinking water for humans </li></ul><ul><li>Drinking water for animals </li></ul><ul><li>Aquatic life habitat </li></ul>
  8. 8. Stormwater Pollutants/Concerns
  9. 9. Nutrients- nitrogen and phosphorus can lead to eutrophication and fish kills
  10. 10. Sediment- clogs drainage ways, clouds rivers and degrades aquatic habitat
  11. 11. Bacteria- public health risk, can lead to closure of fishing areas and loss of revenue Over 1150 acres of NC shellfish waters have been closed since 1990 mostly due to stormwater runoff
  12. 12. Water- flash floods
  13. 13. Stormwater Regulations <ul><li>Address water quantity and water quality leaving developed sites </li></ul><ul><ul><li>Water quantity- design practices to detain first 1” to 3.5” of stormwater from site </li></ul></ul><ul><ul><li>Water quality- reduce transport of nutrients and sediment to receiving waters </li></ul></ul>
  14. 14. Stormwater Best Management Practices (BMPs)
  15. 15. Types of Structural BMPs <ul><li>Wet Ponds </li></ul><ul><li>Stormwater Wetlands </li></ul><ul><li>Bio-retention Areas/ Rain Gardens </li></ul><ul><li>Permeable Pavement </li></ul><ul><li>Riparian Buffers </li></ul><ul><li>Water Management and Conservation </li></ul>
  16. 16. Wet Ponds Inlets Forebay Micropool Outlet Aquatic Shelf
  17. 17. Wet Ponds
  18. 18. Stormwater Wetlands
  19. 19. Stormwater Wetlands
  20. 20. Stormwater Wetlands
  21. 21. Bio-retention/Rain Gardens Inlet
  22. 22. Bio-retention/Rain Gardens
  23. 23. Permeable Pavements
  24. 24. Riparian Buffers
  25. 25. Water Management and Conservation Pump Station 3,000 Gallon Cistern Nest
  26. 26. Water Management and Conservation Nest Water level indicator Spigot
  27. 27. Summary <ul><li>Urban water cycle </li></ul><ul><ul><li>Less infiltration, more runoff </li></ul></ul><ul><ul><li>Stormwater transported pollutants </li></ul></ul><ul><li>Stormwater Pollutants </li></ul><ul><ul><li>Nutrients </li></ul></ul><ul><ul><li>Sediment </li></ul></ul><ul><ul><li>Bacteria </li></ul></ul><ul><ul><li>Water </li></ul></ul><ul><li>Stormwater BMPs </li></ul><ul><ul><li>Wetponds </li></ul></ul><ul><ul><li>Wetlands </li></ul></ul><ul><ul><li>Bio-retention / Rain Gardens </li></ul></ul><ul><ul><li>Permeable Pavements </li></ul></ul><ul><ul><li>Buffers </li></ul></ul><ul><ul><li>Water Harvesting </li></ul></ul>
  28. 28. Acknowledgements <ul><li>Dr. Bill Hunt </li></ul><ul><li>Dr. Deanna Osmond </li></ul><ul><li>Dr. Greg Jennings </li></ul><ul><li>Bill Lord </li></ul><ul><li>Mitch Woodward </li></ul><ul><li>Dwane Jones </li></ul>