Constructing Rain Gardens & Bioswales (PowerPoint)

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Rain Gardens and bioswales are some of our most effective tools in implementing sustainable water practices. In the presentation, Barrett will discuss how rain gardens and bioswales protect, restore, …

Rain Gardens and bioswales are some of our most effective tools in implementing sustainable water practices. In the presentation, Barrett will discuss how rain gardens and bioswales protect, restore, and mimic the natural water cycle. Additionally, Tom will explain how rain gardens and bioswales can help develop a natural solution for water efficiency, and relieve storm water management issues. Rain Gardens and bioswales create natural filters through which our rainwater can flow. We are in essence helping to remove the contaminants, while reducing the speed and volume in which the water runs to the storm drains. By choosing to create a rain garden or other environmentally responsible landscape solution, we can reduce the contaminants that collect in the sewer systems, and make a significant improvement for a cleaner and healthier environment.

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  • 1. Constructing Rain Gardens & Bioswales
    By Tom Barrett
    Green Water Infrastructure, Inc.
    www.ThinkGWI.com
    Tom.Barrett@ThinkGWI.com
    @TomBarrett_GWI
    Follow us on Twitter @TomBarrett_GWI
  • 2. The GREENEconomy
  • 3. How Much Rain Falls in St. Louis?
    January - 1.83"
    February - 1.85"
    March-   2.88"
    April-   3.58"
    May-   4.10"
    June-  4.72"
    July -   3.56"
    August -   3.51"
    September -   3.17"
    October -   2.96"
    November -  2.35"
    December -  1.85"
    Total36.36"
    Image of Rain Falling
  • 4. How Much Water Falls in St. Louis?
    2,500 sq. ft. Roof
    January -    2,852 gallons
    February -    2,883
    March-    4,488
    April-    5,579
    May-    6,390
    June-  7,356
    July -    5,548
    August -    5,470
    September-    4,940
    October -    4,613
    November -  3,662
    December -    2,883
    Total    56,664
    Image of Rain Falling
  • 5. How Much Water Falls in St. Louis?
    3 Acre Commercial Property
    January -    149,075 gallons
    February -    150,705
    March-    234,611
    April-    291,634
    May-    333,994
    June-    384,501
    July -    290,005
    August -    285,932
    September -    258,235
    October -    241,128
    November -    191,436
    December -    150,705
    Total   2,961,961
    Image of Rain Falling
  • 6. How Much Water Falls in St. Louis?
    City Block (5 acres)
    January -    248,459 gallons
    February -    251,176
    March-    391,018
    April-    486,057
    May-    556,657
    June-    640,834
    July -    483,341
    August - 476,553
    September -    430,391
    October -    401,879
    November -    319,061
    December -    251,176
    Total   4,936,602
  • 7. Low Impact Site Development
  • 8. Stormwater Mitigation
    Stormwater Mitigation
    Stormwater Mitigation
    Stormwater Mitigation
    Stormwater Mitigation
  • 9.
  • 10.
  • 11. Image of Rain Falling
  • 12. Pesticide Issues
    Atrazine, Nitrogen, Phosphorous
  • 13. Peak Flow(1 Acre Site)
    cfs – cubic feet per second
  • 14. Peak Flow(1 Acre Site)
    gps – gallons per second
  • 15. Peak Flow(1 Acre Site)
    gpm – gallons per minute
  • 16. Peak Flow(2,500 sq. ft. Roof)
    cfs – cubic feet per second
  • 17. Peak Flow(2,500 sq. ft. Roof)
    gps – gallons per second
  • 18. Peak Flow(2,500 ft. sq. Roof)
    gpm – gallons per minute
  • 19. Stormwater Effects of Urbanization
  • 20. Planting Trees
  • 21. Stormwater Mitigation
    Collection runoff near the source
    Slow it down
    Soak it in
    Filter it
    Apply it to the landscape
    Create habitats
  • 22. Rain Garden
    A Low Spot
    Catches Stormwater
    Deep Rooted Plants
  • 23. Simple Rain garden
  • 24. Bioswales
    Engineered Soils
    Underdrain
  • 25. Rain Gardens
    LocationRain gardens are often located at the end of a roof or drain spout.
    Plant ChoicesChoose plants based on the need for light and soil type.
    DepthA typical Rain Garden is between four to eight inches deep.
    SizeA Rain Garden usually five to ten percent of the impervious surface area.
    SoilA tpical mix is 65% sand, 15% top soil, 25% organic matter.
  • 26. Rain Garden
  • 27. Rain Garden
  • 28. Bioswales
    Burnsville, Minnesota
  • 29. Native Vegetation
    www.epa.gov/greenacres/ www.for-wild.org
  • 30. Street Edges & Medians
  • 31. Street Median
  • 32. Parking Lot Edges
  • 33. Parking Lot Islands
  • 34. Driveway Edge
  • 35. Downspout
  • 36. Neighborhoods
  • 37. Meet Stormwater Regulations
    Detention Volume
    Fix Drainage Issue
    Fix Erosion Issue
    Utility Clearance
    Soil Investigation
    Percolation Test
    Criteria
  • 38. Criteria
    Near the Rainwater Source
    Avoid “End-of Pipe” because of Sedimentation Issues
    Typically 10’ to 20’ from Buildings
    Distributed Evenly Across the Site
    Small Tributary Areas (usually 1 acre or less)
  • 39. Soil Investigation
    • Soil Profile to Five Feet
    • 40. Soil Compaction Level
    • 41. Depth to Groundwater and Bedrock
  • Percolation Test
    • Soil Infiltration Rate
    • 42. Key Design Parameter
    • 43. Percolates water in 24 Hours
  • Sizing
    Determine Design Goals
    Calculate Runoff Volume
    Determine Allowable Depth
    Calculate Surface Area
    Native vs. Engineered Soil Assessment
  • 44. Sizing
    Runoff Volume = Precipitation x Drainage Area x Runoff Coefficient
    RV=Pr x D(area) x C(un
  • 45. Depth
    Based Upon Infiltration Rate
    Infiltration in One Day
    Avoid Misquotes
    Maximum Depth 18” for Safety
  • 46. Surface Area
    Area of Rain Garden (ft2) = Runoff Capture Volume (ft3) / Average Depth (ft)
    A=V/D(average)
  • 47. Engineered Soils
    Bioretention
    Space Available
    Volume of Stormwater
    Drain Faster(the garden can be deeper and not as wide)
  • 48. Plants - Bottom
    Palm Sedge
    Soft Rush
    Tussock Sedge
    Marsh Milkweed
    Blue Flag Iris
    Joe-Pye Weed
  • 49. Plants - Sides
    Purple Coneflower
    Showy Goldenrod
    Smooth Phlox
  • 50. Plants - Edges
    Butterfly Milkweed
    Little Bluestem
    Aromatic Aster
  • 51. Inlets
  • 52. Outlets
  • 53. Curb Cut & Filter Strip
    Controls Sedimentation
  • 54. Splash Blocks
    Prevents Erosion and Gullies
  • 55.
  • 56.
  • 57.
  • 58.
  • 59.
  • 60. Functional Landscapes
  • 61.
  • 62. Thank You