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Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)

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Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)

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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, 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.

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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Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)

  1. 1. Constructing Rain Gardens & Bioswales By Tom Barrett Green Water Infrastructure, Inc. www.ThinkGWI.com Tom.Barrett@ThinkGWI.com Follow us on Twitter @TomBarrett_GWI
  2. 2. The GREEN Economy
  3. 3. How Much Rain Falls in Chicago? January - 1.86" Image of Rain Falling February - 1.58" March - 2.59" April - 3.28" May - 3.75" June - 4.08" July - 3.39" August - 3.38" September - 2.91" October - 2.65" November - 2.09" December - 1.88" Total 33.44"
  4. 4. How Much Water Falls in Chicago? 2,500 sq. ft. Roof January - ,727 gallons 2 Image of Rain Falling February - ,540 2 March - ,130 4 April - 5,735 May - ,268 5 June - 5,657 July - ,470 5 August - ,200 7 September - ,096 5 October - ,223 4 November - 4,691 December - 3,787 Total 6,525 5
  5. 5. How Much Water Falls in Chicago? 3 Acre Commercial Property January - 42,560 gallons 1 Image of Rain Falling February - 32,784 1 March - 15,876 2 April - 299,783 May - 75,344 2 June - 295,710 July - 85,934 2 August - 76,358 3 September - 66,383 2 October - 20,764 2 November - 245,203 December - 197,954 Total 2,954,654
  6. 6. How Much Water Falls in Chicago? City Block (660’ x 660’ – 10 acres) January - 75,195 gallons 4 February - 42,610 4 March - 19,581 7 April - 999,267 May - 17,805 9 June - 985,690 July - 53,105 9 August - ,254,515 1 September - 87,936 8 October - 35,873 7 November - 817,335 December - 659,842 Total 9,848,756
  7. 7. LOW IMPACT SITE DEVELOPMENT
  8. 8. Stormwater Mitigation Stormwater Mitigation Stormwater Mitigation Stormwater Mitigation Stormwater Mitigation
  9. 9. Image of Rain Falling
  10. 10. PESTICIDE ISSUES ATRAZINE, NITROGEN, PHOSPHOROUS
  11. 11. Peak Flow (1 Acre Site) Grass Field Roof 1 Year Storm 1.4 cfs 4.3 cfs 2 Year Storm 2.1 cfs 5.4 cfs 10 Year Storm 4.3 cfs 8.0 cfs 25 Year Storm 5.7 cfs 9.5 cfs 100 Year Storm 8.0 cfs 12.0 cfs cfs – cubic feet per second
  12. 12. Peak Flow (1 Acre Site) Grass Field Roof 1 Year Storm 10.5 gps 32.2 gps 2 Year Storm 15.7 gps 40.4 gps 10 Year Storm 32.2 gps 59.8 gps 25 Year Storm 42.6 gps 71.1 gps 100 Year Storm 59.8 gps 89.8 gps gps – gallons per second
  13. 13. Peak Flow (1 Acre Site) Grass Field Roof 1 Year Storm 630 gpm 1,932 gpm 2 Year Storm 942 gpm 2,424 gpm 10 Year Storm 1,932 gpm 3,588 gpm 25 Year Storm 2,556 gpm 4,266 gpm 100 Year Storm 3,588 gpm 5,388 gpm gpm – gallons per minute
  14. 14. Peak Flow (2,500 sq. ft. Roof) Grass Field Roof 1 Year Storm 0.08 cfs 0.25 cfs 2 Year Storm 0.12 cfs 0.31 cfs 10 Year Storm 0.25 cfs 0.46 cfs 25 Year Storm 0.33 cfs 0.55 cfs 100 Year Storm 0.46 cfs 0.69 cfs cfs – cubic feet per second
  15. 15. Peak Flow (2,500 sq. ft. Roof) Grass Field Roof 1 Year Storm 0.60 gps 1.85 gps 2 Year Storm 0.90 gps 2.32 gps 10 Year Storm 1.85 gps 3.43 gps 25 Year Storm 2.44 gps 4.08 gps 100 Year Storm 3.43 gps 5.15 gps gps – gallons per second
  16. 16. Peak Flow (2,500 ft. sq. Roof) Grass Field Roof 1 Year Storm 36 gpm 111 gpm 2 Year Storm 54 gpm 139 gpm 10 Year Storm 111 gpm 206 gpm 25 Year Storm 147 gpm 245 gpm 100 Year Storm 206 gpm 309 gpm gpm – gallons per minute
  17. 17. Change in Peak Runoff Flow Before and after Development 300% 225% 150% 75% 0% 1 Year Storm Year Storm Year Storm Year Storm Year Storm 2 10 25 100 Stormwater Effects of Urbanization
  18. 18. PLANTING TREES
  19. 19. Stormwater Mitigation – Collection runoff near the source – Slow it down – Soak it in – Filter it – Apply it to the landscape – Create habitats
  20. 20. Rain Garden A Low Spot Catches Stomwater Deep Rooted Plants
  21. 21. SIMPLE RAIN GARDEN
  22. 22. Bioswales Engineered Soils Underdrain
  23. 23. Location Rain gardens are Plant Choices often located at the end of a roof or Choose plants based drain spout. on the need for light and soil type. Depth Size Soil A Rain Garden usually A tpical mix is 65% A typical Rain Garden five to ten percent sand, 15% top soil, is between four to of the impervious 25% organic matter. eight inches deep. surface area. RAIN GARDENS
  24. 24. RAIN GARDEN
  25. 25. RAIN GARDEN
  26. 26. BIOSWALES BURNSVILLE, MINNESOTA
  27. 27. NATIVE VEGETATION WWW.EPA.GOV/GREENACRES/ WWW.FOR-WILD.ORG
  28. 28. Street Edges & Medians
  29. 29. Parking Lot Edges
  30. 30. Parking Lot Islands
  31. 31. Driveway Edge
  32. 32. Downspout
  33. 33. NEIGHBORHOODS
  34. 34. Criteria Meet Stormwater Utility Clearance Regulations Soil Investigation Detention Volume Percolation Test Fix Drainage Issue Fix Erosion Issue
  35. 35. Criteria Near the Rainwater Distributed Evenly Source Across the Site Avoid “End-of Pipe” Small Tributary Areas because of (usually 1 acre or less) Sedimentation Issues Typically 10’ to 20’ from Buildings
  36. 36. Soil Investigation •Soil Profile to Five Feet •Soil Compaction Level •Depth to Groundwater and Bedrock
  37. 37. Percolation Test •Soil Infiltration Rate •Key Design Parameter •Percolates water in 24 Hours
  38. 38. Sizing Determine Design Native vs. Engineered Goals Soil Assessment Calculate Runoff Volume Determine Allowable Depth Calculate Surface Area
  39. 39. Sizing Runoff Volume = Precipitation x Drainage Area x Runoff Coefficient RV=Pr x D(area) x C(un
  40. 40. Depth Based Upon Infiltration Rate Infiltration in One Day Avoid Misquotes Maximum Depth 18” for Safety
  41. 41. Surface Area Area of Rain Garden (ft2) = Runoff Capture Volume (ft3) / Average Depth (ft) A=V/D(average)
  42. 42. Engineered Soils Bioretention Space Available Volume of Stormwater Drain Faster (the garden can be deeper and not as wide)
  43. 43. Plants - Bottom Palm Sedge Soft Rush Tussock Sedge Marsh Milkweed Blue Flag Iris Joe-Pye Weed
  44. 44. Plants - Sides Purple Coneflower Showy Goldenrod Smooth Phlox
  45. 45. Plants - Edges Butterfly Milkweed Little Bluestem Aromatic Aster
  46. 46. Inlets
  47. 47. Outlets
  48. 48. Curb Cut & Filter Strip Controls Sedimentation
  49. 49. Splash Blocks Prevents Erosion and Gullies
  50. 50. FUNCTIONAL LANDSCAPES
  51. 51. Green • Water • Infrastructure Green • Water • Infrastructure Green • Water • Infrastructure Green • Water • Infrastructure Green • Water • Infrastructure
  52. 52. Thank You

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