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BMP Design Specifications

BMP Design Specifications. 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. 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 box

  9. Keep Erosion Controls in Place Until Drainage Area is Stabilized but it didn’t infiltrate Irving St Images P5240081 & P4260061

  10. Unapproved Material Substitutions Why this didn’t infiltrate

  11. Inadequate Erosion Control or Protection of BMP Areas

  12. Plant Density PlantLocation and density issues

  13. Tree Planters – Design Criteria

  14. Tree Planter Detail

  15. Planter box alternative Source: Army: Public Works Technical Bulletin 200-1-62

  16. 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

  17. Permeable Pavement – Design Criteria

  18. Permeable Pavement Detail

  19. 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

  20. Water Quality Swales– Design Criteria

  21. Water Quality Swale Detail

  22. 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

  23. Dry Ponds – Design Criteria

  24. Dry Pond Detail

  25. Dry pond diversion at navy yard

  26. 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

  27. Downspout Disconnection – Design Details

  28. Downspout Disconnection Detail

  29. 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

  30. Sheet Flow – Runoff Reduction

  31. Sheet Flow – Design Criteria

  32. Sheet Flow Detail

  33. Interim biosoilamendment

  34. 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

  35. 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

  36. Urban Reforestation Detail

  37. 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

  38. Rain Tanks – Design Details

  39. Rain Tanks Detail

  40. 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

  41. Green Roof – Design Details

  42. Green Roof Detail

  43. GHP CENTER for TRAINING and DEVELOPMENT Porous/Pervious Pavements • Sustainable Characteristics and Benefits : • Americans with Disabilities Act (ADA) Compliant • Shoes, wheel chairs, crutches • Noise Reduction • Stormwater Mitigation/Management • Cooler Surface • Supports Tree Growth Source: Interlocking Concrete Pavement Institute (ICPI) Source: Interlocking Concrete Pavement Institute (ICPI)

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