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BMP Design Specifications

BMP Design Specifications. Bioretention. Runoff Reduction Credit: Leve l 1 – 40% Level 2 – 80% Two design types: Rain garden, for small-scale residential applications Bioretention basin, for large-scale applications Applicable to green streets and highways. Rain Garden – Design Criteria.

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BMP Design Specifications

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  1. BMP Design Specifications

  2. Bioretention • Runoff Reduction Credit: • Level 1 – 40% • Level 2 – 80% • Two design types: • Rain garden, for small-scale residential applications • Bioretention basin, for large-scale applications • Applicable to green streets and highways

  3. Rain Garden – Design Criteria

  4. Bioretention Basin – Design Criteria

  5. Rain Garden Detail

  6. Bioretention Detail

  7. Tree Planters / Urban Bioretention • Runoff Reduction Credit: • Level 1 – 40% • Used along curbside • Planted with trees or ornamental vegetation • May be placed adjacent to buildings if impermeable barrier is used

  8. Tree Planters – Design Criteria

  9. Tree Planter Detail

  10. Permeable Pavement • Runoff Reduction Credit: • Level 1 – 45% • Level 2 – 75% • Permitted surfaces: • Permeable pavers • Reinforced gravel • Reinforced turf • Used in parking areas, sidewalks, trails, and low traffic roadways

  11. Permeable Pavement – Design Criteria

  12. Permeable Pavement Detail

  13. Water Quality Swales • Runoff Reduction Credit: • Level 1 – 40% • Level 2 – 60% • RR Credit for Dry Swales only • Used to provide runoff reduction, water quality improvement, and conveyance • Applicable to green streets and highways

  14. Water Quality Swales– Design Criteria

  15. Water Quality Swale Detail

  16. Dry Ponds • Runoff Reduction Credit: • Level 1 – 0% • Level 2 – 15% • Final element in treatment train, used only after other runoff reduction practices have been applied

  17. Dry Ponds – Design Criteria

  18. Dry Pond Detail

  19. Downspout Disconnection • Runoff Reduction Credit: • HSG A or B – 50% • HSG C or D – 25% • Minimum lot size: • 6,000 sf, unless used with a rain barrel • Supplemental runoff reduction practices are needed for HSG C and D soils • Compost amendments • Rain gardens

  20. Downspout Disconnection – Design Details

  21. Downspout Disconnection Detail

  22. Sheet Flow • Runoff Reduction Credit: • 50-75% • Level spreader creates sheet flow to vegetated filter strip or open space • Requires 2-6% slopes • Appropriate for small drainage areas • Stormwater must not discharge directly to sensitive areas

  23. Sheet Flow – Runoff Reduction

  24. Sheet Flow – Design Criteria

  25. Sheet Flow Detail

  26. Urban Reforestation • Runoff Reduction Credit: • Twice the forest Rv factor for the corresponding soil type. • Equal to the forest Rv factor if amended soils are used in conjunction with reforestation. • Provides additional air quality improvements, shading, habitat, and aesthetic benefits • Applicable to green streets and highways

  27. Urban Reforestation – Design Criteria • Minimum 5,000 square foot contiguous area • No more than 20% of a single tree species • Must achieve 75% forest canopy within 10 years • Minimum sapling size: 6-8 feet in height • Reforestation area must be protected and maintained

  28. Urban Reforestation Detail

  29. Rain Tanks / Cisterns • Runoff Reduction Credit: • Up to 90% • Provides supplemental water source for non-potable uses • Toilet flushing • Irrigation • Systems must be designed for consistent year-round drawdown

  30. Rain Tanks – Design Details

  31. Rain Tanks Detail

  32. Green Roof • Runoff Reduction Credit: • Level 1 – 45% • Level 2 – 60% • Provides additional energy savings, air quality, and aesthetic benefits • Runoff reduction goals are primarily addressed using extensive systems

  33. Green Roof – Design Details

  34. Green Roof Detail

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