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Making Bioretention Work

Making Bioretention Work. Sustainability for all the places between the buildings. Green Girl Land Development Solutions. Certified Woman Owned Business Sole Proprietorship NOT Design & Permitting Technical Assistance & Project Based Mentoring. Agenda.

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Making Bioretention Work

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  1. Making Bioretention Work Sustainability for all the places between the buildings.

  2. Green Girl Land Development Solutions • Certified Woman Owned Business • Sole Proprietorship • NOT Design & Permitting • Technical Assistance & Project Based Mentoring

  3. Agenda • OVERALL MESSAGE: How to create more effective facilities (ones that protect your watershed) that are less costly and lower maintenance! • Top 10 Common Mistakes to Avoid: Considerations for planning, design, construction & maintenance of common bioretention components

  4. 1. Suitable Infiltration Areasare NOT found on a NRCS soils map

  5. You must test your soil where bioretention is going to be located

  6. 2. Flow-Through (Lined) Facilities are NOT nearly as good as infiltration facilties Lined on three sides with an impermeable liner = “Flow-Through” 43

  7. Detention Basin & Flow Through Facilities Resultsfrom a Watershed Perspective

  8. 3. Don’t Over-engineer It 31

  9. OSU Extension - Sea Grant OregonChoose the Right Rain Garden Wizard Find out where you should and shouldn’t infiltrate! http://extension.oregonstate.edu/stormwater/choose-right-rain-garden

  10. 4. Consider Contribution Area Don’t Underestimate Flows or WQ Impacts

  11. 4. Consider the Contribution AreaDon’t Underestimate Flows or WQ Impacts • Most gravel roads and parking lots are impervious

  12. 4. Consider Contribution Area • Copper • Zinc (Galvanized) • Iron (Rust=iron) (in roofs & downspouts) • What else is coming from YOUR site?

  13. 4. Consider Contribution Area What pollutants are intentionally designed intoyour facility?

  14. 5. Undercutting can be protected against • A curb or impermeable liner (vertically installed) would have prevented damage to the adjacent impervious pavement at this inlet

  15. 6. Settle out Sediments Before Bioretaining

  16. And make it easy on the maintenance folks • Rip rap makes it difficult to remove sediment from and re-suspension is more likely than in sumped structures (shown previously)

  17. 7. Help Water Make 90 degree turns Round the corners Make curb cut at least a shovel wide or wider Depressed gutter

  18. 7. Help Water Make 90 degree turns

  19. 8. Protect Against Erosionwith overland flow

  20. 8. Protect Against ErosionRounded Rock Doesn’t Adequately Slow Water • Use crushed, angular rock instead

  21. 8. Protect Against ErosionDon’t plant vegetation in rows parallel to flows

  22. 8. Protect Against Erosionbut don’t use the dry creek bed look • To maximize water quality treatment, plants must be in the bottom, where the most polluted “water quality” storm flows the most often.

  23. 9. Design to pond water for better WQ

  24. 10. Choose Vegetation CarefullyUse a diversity of species… or not

  25. 10. Choose Vegetation CarefullyUse Native Vegetation (not “harmless” non-natives)

  26. 10. Choose Vegetation CarefullyUse Native Vegetation (not “harmless” non-natives)

  27. 11. One last best practiceHave fun!

  28. Thank You for Coming Today! Sustainability for all the places between the buildings.

  29. Bioretention is NOT a Silver Bullet Pollution

  30. And can make things worse.There’s no substitute for SOURCE CONTROL Pollution

  31. Some Common Pollutants Sediment (air particulates) Nutrients Feces Other debris Runoff volumes Sediment/turbidity Hydrocarbons Heavy metals (particles & soluble) Other chemicals Runoff volume Sediment/turbidity fertilizerspesticidesherbicides Runoff volume

  32. Bioretention& Development ? Sediment/turbidity Hydrocarbons Heavy metals (particles & soluble) Other chemicals Runoff volume ? Sediment/turbidity fertilizerspesticidesherbicides Runoff volume Sediment (air particulates) Feces Other debris Runoff volume ?

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