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Rain Gardens
& Bioswales


By Tom Barrett
Green Water Infrastructure, Inc.
www.ThinkGWI.com
                                   Follow us on Twitter @TomBarrett_GWI
Tom.Barrett@ThinkGWI.com
                                                           © 2011 Tom Barrett
The GREEN
Economy
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"
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
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
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
Low Impact Site Development
Stormwater Mitigation
Stormwater Mitigation

Stormwater Mitigation

Stormwater Mitigation

Stormwater Mitigation
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
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
Change in Peak Runoff Flow Before and after Development
300%


225%


150%


 75%


  0%
                   m                  m                   m                   m                    m
             S tor              S tor                S tor               S tor                S tor
        ar                  r                    r                   r                    r
     Ye                  ea                  Ye
                                                a
                                                                 Ye
                                                                    a
                                                                                      Ye
                                                                                         a
   1                   2Y                 10                  25                    0
                                                                                  10
              Stormwater Effects of Urbanization
Image of Rain Falling
Pesticide Issues
Atrazine, Nitrogen, Phosphorous
Stormwater Mitigation

– Collection runoff near the
  source

– Slow it down

– Soak it in

– Filter it

– Apply it to the landscape

– Create habitats
Simple Rain garden
Bioswales


 Engineered Soils

 Underdrain
Location

           Plant Choices                                                              Rain gardens are often
                                                                                       located at the end of
                                                                                      a roof or drain spout.
       Choose plants based 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 of   sand, 15% top soil,
                             is between four to
                                                   the impervious surface   25% organic matter.
                             eight inches deep.
                                                            area.




Rain Gardens
Rain Garden
Bioswales
Burnsville, Minnesota
Native Vegetation
www.epa.gov/greenacres/   www.for-wild.org
Street Edges
& Medians
Parking Lot
Edges
Parking Lot
Islands
Driveway
Edge
Neighborhoods
Rain Garden
Indianapolis
Rain Garden	
Indianapolis - Fall Creek Parkway
Functional Landscapes
Thank You

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Rain Gardens & Bioswales Construction (Brownsburg, January 2011)

  • 1. Rain Gardens & Bioswales By Tom Barrett Green Water Infrastructure, Inc. www.ThinkGWI.com Follow us on Twitter @TomBarrett_GWI Tom.Barrett@ThinkGWI.com © 2011 Tom Barrett
  • 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. 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. 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. 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. Low Impact Site Development
  • 8. Stormwater Mitigation Stormwater Mitigation Stormwater Mitigation Stormwater Mitigation Stormwater Mitigation
  • 9.
  • 10. 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
  • 11. 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
  • 12. Change in Peak Runoff Flow Before and after Development 300% 225% 150% 75% 0% m m m m m S tor S tor S tor S tor S tor ar r r r r Ye ea Ye a Ye a Ye a 1 2Y 10 25 0 10 Stormwater Effects of Urbanization
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  • 14. Image of Rain Falling
  • 16. Stormwater Mitigation – Collection runoff near the source – Slow it down – Soak it in – Filter it – Apply it to the landscape – Create habitats
  • 19. Location Plant Choices Rain gardens are often located at the end of a roof or drain spout. Choose plants based 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 of sand, 15% top soil, is between four to the impervious surface 25% organic matter. eight inches deep. area. Rain Gardens
  • 29. Rain Garden Indianapolis - Fall Creek Parkway
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