Constructing Rain Gardens & Bioswales<br />By Tom Barrett <br />Green Water Infrastructure, Inc.<br />www.ThinkGWI.com<br ...
The GREENEconomy<br />
How Much Rain Falls in St. Louis?<br />January - 1.83"<br />February - 1.85"<br />March-   2.88"<br />April-   3.58"<br />...
How Much Water Falls in St. Louis?<br />2,500 sq. ft. Roof<br />January -    2,852 gallons<br />February -    2,883<br />M...
How Much Water Falls in St. Louis?<br />3 Acre Commercial Property<br />January -    149,075 gallons<br />February -    15...
How Much Water Falls in St. Louis?<br />City Block (5 acres)<br />January -    248,459 gallons<br />February -    251,176<...
Low Impact Site Development<br />
Stormwater Mitigation<br />Stormwater Mitigation<br />Stormwater Mitigation<br />Stormwater Mitigation<br />Stormwater Mit...
Image of Rain Falling<br />
Pesticide Issues<br />Atrazine, Nitrogen, Phosphorous<br />
Peak Flow(1 Acre Site)<br />cfs – cubic feet per second<br />
Peak Flow(1 Acre Site)<br />gps – gallons per second<br />
Peak Flow(1 Acre Site)<br />gpm – gallons per minute<br />
Peak Flow(2,500 sq. ft. Roof)<br />cfs – cubic feet per second<br />
Peak Flow(2,500 sq. ft. Roof)<br />gps – gallons per second<br />
Peak Flow(2,500 ft. sq. Roof)<br />gpm – gallons per minute<br />
Stormwater Effects of Urbanization<br />
Planting Trees<br />
Stormwater Mitigation<br />Collection runoff near the source<br />Slow it down<br />Soak it in<br />Filter it <br />Apply ...
Rain Garden<br />A Low Spot<br />Catches Stormwater<br />Deep Rooted Plants<br />
Simple Rain garden<br />
Bioswales<br />Engineered Soils<br />Underdrain<br />
Rain Gardens<br />LocationRain gardens are often located at the end of a roof or drain spout.<br />Plant ChoicesChoose pla...
Rain Garden<br />
Rain Garden<br />
Bioswales<br />Burnsville, Minnesota<br />
Native Vegetation<br />www.epa.gov/greenacres/                    www.for-wild.org<br />
Street Edges & Medians<br />
Street Median<br />
Parking Lot Edges<br />
Parking Lot Islands<br />
Driveway Edge<br />
Downspout<br />
Neighborhoods<br />
Meet Stormwater Regulations<br />Detention Volume<br />Fix Drainage Issue<br />Fix Erosion Issue<br />Utility Clearance<br...
Criteria	<br />Near the Rainwater Source<br />Avoid “End-of Pipe” because of Sedimentation Issues<br />Typically 10’ to 20...
Soil Investigation	<br /><ul><li>Soil Profile to Five Feet
Soil Compaction Level
Depth to Groundwater and Bedrock</li></li></ul><li>Percolation Test	<br /><ul><li>Soil Infiltration Rate
Key Design Parameter
Percolates water in 24 Hours</li></li></ul><li>Sizing <br />Determine Design Goals<br />Calculate Runoff Volume<br />Deter...
Sizing<br />Runoff Volume = Precipitation x Drainage Area x Runoff Coefficient<br />RV=Pr  x D(area) x C(un<br />
Depth<br />Based Upon Infiltration Rate<br />Infiltration in One Day<br />Avoid Misquotes<br />Maximum Depth 18” for Safet...
Surface Area<br />Area of Rain Garden (ft2) = Runoff Capture Volume (ft3) / Average Depth (ft)<br />A=V/D(average)<br />
Engineered Soils<br />Bioretention<br />Space Available<br />Volume of Stormwater<br />Drain Faster(the garden can be deep...
Plants - Bottom<br />Palm Sedge<br />Soft Rush<br />Tussock Sedge<br />Marsh Milkweed<br /> Blue Flag Iris<br />Joe-Pye We...
Plants - Sides<br />Purple Coneflower<br />Showy Goldenrod<br />Smooth Phlox<br />
Plants - Edges<br />Butterfly Milkweed<br />Little Bluestem<br />Aromatic Aster<br />
Inlets<br />
Outlets<br />
Curb Cut & Filter Strip<br />Controls Sedimentation<br />
Splash Blocks<br />Prevents Erosion and Gullies<br />
Functional Landscapes<br />
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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, 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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Constructing Rain Gardens & Bioswales (PowerPoint)

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

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