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Stormwater Treatment

Stormwater Treatment. Using best management practices. Courtesy of Oklahoma Farm Bureau. Courtesy of The VanNatta Forestry and Logging. Courtesy of BC Ministry of Forests and Range. Land Uses and Water Quality. sensitive. good. impacted. degraded. fair. stream quality.

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Stormwater Treatment

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  1. Stormwater Treatment Using best management practices

  2. Courtesy of Oklahoma Farm Bureau Courtesy of The VanNatta Forestry and Logging Courtesy of BC Ministry of Forests and Range Land Uses and Water Quality

  3. sensitive good impacted degraded fair stream quality seriously degraded poor Imperviousness affects stream quality 10% 25% 60% percent imperviousness in the watershed Credit: Center for Watershed Protection

  4. Urbanization Impacts to Water Quantity and Quality Stream Corridor Restoration: Principles, Processes, and Practices, 10/98, by the Federal Interagency Stream Restoration Working Group (FISRWG)

  5. Reformulated Impervious Cover Model Schueler, T. R., L. Fraley-McNeal, et al. (2009). "Is Impervious Cover Still Important? Review of Recent Research." Journal of Hydrologic Engineering 14(4): 309-315.

  6. Quadratic regression analysis indicated a highly correlated response between increasing imperviousness and degraded water quality (r2=.74, p<.0001) using the following model: (FBI)ln =-5.45067 +(0.17317*CN)+ (-0.00101*(CN^2)) Where: FBI=Family Benthic Index; CN=Curve Number Regression

  7. StormwaterRunoff Picks Up: Excess fertilizers Oil and grease Litter Sediment Salt Bacteria Nutrients Phosphorous Pesticides Atmospheric deposition Herbicides Insecticides Nitrogen Total suspended solids Heavy metals Pathogens

  8. Stormwater Runoff (nonpoint source) • Picks up pollutants • Often flows right into streams • Increases flooding and erosion

  9. Different Approaches are Beneficial Photo: American Concrete Industries Treat water at the source Mindset shift More sustainable approach Better wildlife habitat

  10. Best Management Practices (BMPs): Rain Gardens Water Harvesting (Cisterns/ Rain Barrels) Permeable Pavement Pocket Wetlands Swales Green Roofs Level Spreaders

  11. Best Management Practices BMPs are structural or nonstructural tools used to prevent or reduce the amount of pollutants entering into a waterbody through nonpoint sources (NPS). Methods to slow, treat, and cool stormwater runoff

  12. Vegetated roof Promotes transpiration

  13. Porous paving Promotes infiltration

  14. TRM: Turf Reinforced Matting Conveys runoff and filters some pollutants such as sediment

  15. Rain pocket Temporary ponding to treat nutrients

  16. Rough grading

  17. One growing season later

  18. Stormwater wetland Slows runoff and treats pollutants such as nutrients

  19. Clearing site

  20. Shallow, leaky pond

  21. Full Pool, Almost

  22. Bioretention Slows runoff and treats pollutants such as sediment

  23. Flood irrigation style Bioretention Slows runoff and treats pollutants such as sediment

  24. Turf Bioretention

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