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ConstructingRain Gardens& BioswalesBy Tom BarrettGreen Water Infrastructure, Inc.www.ThinkGWI.comTom.Barrett@ThinkGWI.com ...
The GREENEconomy
How Much Rain Falls in Chicago?January      -  1.86"   Image of Rain FallingFebruary     -  1.58"March        -  2.59"Apri...
How Much Water Falls in Chicago?                     2,500 sq. ft. RoofJanuary  -  ,727 gallons               2           ...
How Much Water Falls in Chicago?                 3 Acre Commercial PropertyJanuary  -  42,560 gallons               1     ...
How Much Water Falls in Chicago?                           City Block                    (660’ x 660’ – 10 acres)January  ...
LOW IMPACT SITE DEVELOPMENT
Stormwater MitigationStormwater MitigationStormwater MitigationStormwater MitigationStormwater Mitigation
Image of Rain Falling
PESTICIDE ISSUESATRAZINE, NITROGEN, PHOSPHOROUS
Peak Flow                   (1 Acre Site)                           Grass Field          Roof1 Year Storm                 ...
Peak Flow                  (1 Acre Site)                         Grass Field         Roof1 Year Storm               10.5 g...
Peak Flow                   (1 Acre Site)                         Grass Field          Roof1 Year Storm               630 ...
Peak Flow                 (2,500 sq. ft. Roof)                            Grass Field          Roof1 Year Storm           ...
Peak Flow                 (2,500 sq. ft. Roof)                           Grass Field         Roof1 Year Storm             ...
Peak Flow                 (2,500 ft. sq. Roof)                           Grass Field         Roof1 Year Storm             ...
Change in Peak Runoff Flow Before and after Development   300%   225%   150%    75%     0%    1 Year Storm Year Storm Year...
PLANTING TREES
Stormwater Mitigation– Collection runoff near the  source– Slow it down– Soak it in– Filter it– Apply it to the landscape–...
Rain GardenA Low SpotCatches StomwaterDeep Rooted Plants
SIMPLE RAIN GARDEN
Bioswales Engineered Soils Underdrain
Location                                                                                           Rain gardens are       ...
RAIN GARDEN
RAIN GARDEN
BIOSWALESBURNSVILLE, MINNESOTA
NATIVE VEGETATIONWWW.EPA.GOV/GREENACRES/   WWW.FOR-WILD.ORG
Street Edges& Medians
Parking LotEdges
Parking LotIslands
DrivewayEdge
Downspout
NEIGHBORHOODS
CriteriaMeet Stormwater      Utility ClearanceRegulations                     Soil InvestigationDetention Volume          ...
CriteriaNear the Rainwater     Distributed EvenlySource                 Across the SiteAvoid “End-of Pipe”    Small Tribut...
SoilInvestigation	•Soil Profile to Five Feet•Soil Compaction Level•Depth to Groundwater andBedrock
PercolationTest	•Soil Infiltration Rate•Key Design Parameter•Percolates water in 24Hours
SizingDetermine Design      Native vs. EngineeredGoals                 Soil AssessmentCalculate RunoffVolumeDetermine Allo...
SizingRunoffVolume =Precipitation xDrainage Area x RunoffCoefficientRV=Pr x D(area) x C(un
DepthBased UponInfiltration RateInfiltration in One DayAvoid MisquotesMaximum Depth 18”for Safety
Surface AreaArea of Rain Garden(ft2) = Runoff CaptureVolume (ft3) / AverageDepth (ft)A=V/D(average)
Engineered SoilsBioretentionSpace AvailableVolume of StormwaterDrain Faster(the garden can bedeeper and not aswide)
Plants -BottomPalm SedgeSoft RushTussock SedgeMarsh Milkweed Blue Flag IrisJoe-Pye Weed
Plants -SidesPurple ConeflowerShowy GoldenrodSmooth Phlox
Plants -EdgesButterfly MilkweedLittle BluestemAromatic Aster
Inlets
Outlets
Curb Cut &Filter StripControls Sedimentation
SplashBlocksPrevents Erosion and Gullies
FUNCTIONAL LANDSCAPES
Green • Water • InfrastructureGreen • Water • InfrastructureGreen • Water • InfrastructureGreen • Water • InfrastructureGr...
Thank You
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
Sustainable Site Development: Rain Garden & Bioswale Construction(Chicago, March 2011)
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.

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

  1. 1. ConstructingRain Gardens& BioswalesBy Tom BarrettGreen Water Infrastructure, Inc.www.ThinkGWI.comTom.Barrett@ThinkGWI.com Follow us on Twitter @TomBarrett_GWI
  2. 2. The GREENEconomy
  3. 3. How Much Rain Falls in Chicago?January - 1.86" Image of Rain FallingFebruary - 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. RoofJanuary - ,727 gallons 2 Image of Rain FallingFebruary - ,540 2March - ,130 4April - 5,735May - ,268 5June - 5,657July - ,470 5August - ,200 7September- ,096 5October - ,223 4November - 4,691December - 3,787Total 6,525 5
  5. 5. How Much Water Falls in Chicago? 3 Acre Commercial PropertyJanuary - 42,560 gallons 1 Image of Rain FallingFebruary - 32,784 1March - 15,876 2April - 299,783May - 75,344 2June - 295,710July - 85,934 2August - 76,358 3September - 66,383 2October - 20,764 2November - 245,203December - 197,954Total 2,954,654
  6. 6. How Much Water Falls in Chicago? City Block (660’ x 660’ – 10 acres)January - 75,195 gallons 4February - 42,610 4March - 19,581 7April - 999,267May - 17,805 9June - 985,690July - 53,105 9August - ,254,515 1September - 87,936 8October - 35,873 7November - 817,335December - 659,842Total 9,848,756
  7. 7. LOW IMPACT SITE DEVELOPMENT
  8. 8. Stormwater MitigationStormwater MitigationStormwater MitigationStormwater MitigationStormwater Mitigation
  9. 9. Image of Rain Falling
  10. 10. PESTICIDE ISSUESATRAZINE, NITROGEN, PHOSPHOROUS
  11. 11. Peak Flow (1 Acre Site) Grass Field Roof1 Year Storm 1.4 cfs 4.3 cfs2 Year Storm 2.1 cfs 5.4 cfs10 Year Storm 4.3 cfs 8.0 cfs25 Year Storm 5.7 cfs 9.5 cfs100 Year Storm 8.0 cfs 12.0 cfs cfs – cubic feet per second
  12. 12. Peak Flow (1 Acre Site) Grass Field Roof1 Year Storm 10.5 gps 32.2 gps2 Year Storm 15.7 gps 40.4 gps10 Year Storm 32.2 gps 59.8 gps25 Year Storm 42.6 gps 71.1 gps100 Year Storm 59.8 gps 89.8 gps gps – gallons per second
  13. 13. Peak Flow (1 Acre Site) Grass Field Roof1 Year Storm 630 gpm 1,932 gpm2 Year Storm 942 gpm 2,424 gpm10 Year Storm 1,932 gpm 3,588 gpm25 Year Storm 2,556 gpm 4,266 gpm100 Year Storm 3,588 gpm 5,388 gpm gpm – gallons per minute
  14. 14. Peak Flow (2,500 sq. ft. Roof) Grass Field Roof1 Year Storm 0.08 cfs 0.25 cfs2 Year Storm 0.12 cfs 0.31 cfs10 Year Storm 0.25 cfs 0.46 cfs25 Year Storm 0.33 cfs 0.55 cfs100 Year Storm 0.46 cfs 0.69 cfs cfs – cubic feet per second
  15. 15. Peak Flow (2,500 sq. ft. Roof) Grass Field Roof1 Year Storm 0.60 gps 1.85 gps2 Year Storm 0.90 gps 2.32 gps10 Year Storm 1.85 gps 3.43 gps25 Year Storm 2.44 gps 4.08 gps100 Year Storm 3.43 gps 5.15 gps gps – gallons per second
  16. 16. Peak Flow (2,500 ft. sq. Roof) Grass Field Roof1 Year Storm 36 gpm 111 gpm2 Year Storm 54 gpm 139 gpm10 Year Storm 111 gpm 206 gpm25 Year Storm 147 gpm 245 gpm100 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 GardenA Low SpotCatches StomwaterDeep 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. BIOSWALESBURNSVILLE, MINNESOTA
  27. 27. NATIVE VEGETATIONWWW.EPA.GOV/GREENACRES/ WWW.FOR-WILD.ORG
  28. 28. Street Edges& Medians
  29. 29. Parking LotEdges
  30. 30. Parking LotIslands
  31. 31. DrivewayEdge
  32. 32. Downspout
  33. 33. NEIGHBORHOODS
  34. 34. CriteriaMeet Stormwater Utility ClearanceRegulations Soil InvestigationDetention Volume Percolation TestFix Drainage IssueFix Erosion Issue
  35. 35. CriteriaNear the Rainwater Distributed EvenlySource Across the SiteAvoid “End-of Pipe” Small Tributary Areasbecause of (usually 1 acre or less)Sedimentation IssuesTypically 10’ to 20’from Buildings
  36. 36. SoilInvestigation •Soil Profile to Five Feet•Soil Compaction Level•Depth to Groundwater andBedrock
  37. 37. PercolationTest •Soil Infiltration Rate•Key Design Parameter•Percolates water in 24Hours
  38. 38. SizingDetermine Design Native vs. EngineeredGoals Soil AssessmentCalculate RunoffVolumeDetermine AllowableDepthCalculate SurfaceArea
  39. 39. SizingRunoffVolume =Precipitation xDrainage Area x RunoffCoefficientRV=Pr x D(area) x C(un
  40. 40. DepthBased UponInfiltration RateInfiltration in One DayAvoid MisquotesMaximum Depth 18”for Safety
  41. 41. Surface AreaArea of Rain Garden(ft2) = Runoff CaptureVolume (ft3) / AverageDepth (ft)A=V/D(average)
  42. 42. Engineered SoilsBioretentionSpace AvailableVolume of StormwaterDrain Faster(the garden can bedeeper and not aswide)
  43. 43. Plants -BottomPalm SedgeSoft RushTussock SedgeMarsh Milkweed Blue Flag IrisJoe-Pye Weed
  44. 44. Plants -SidesPurple ConeflowerShowy GoldenrodSmooth Phlox
  45. 45. Plants -EdgesButterfly MilkweedLittle BluestemAromatic Aster
  46. 46. Inlets
  47. 47. Outlets
  48. 48. Curb Cut &Filter StripControls Sedimentation
  49. 49. SplashBlocksPrevents Erosion and Gullies
  50. 50. FUNCTIONAL LANDSCAPES
  51. 51. Green • Water • InfrastructureGreen • Water • InfrastructureGreen • Water • InfrastructureGreen • Water • InfrastructureGreen • Water • Infrastructure
  52. 52. Thank You

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