This presentation was created to provide property ownerswith an overview of rain garden construction that can beused to re...
Build YourOwn RainGarden         Rose Mary Seymour   Engineering Extension Specialist        CAES-Griffin Campus   Ag Poll...
What is a Rain                          Garden?• An area in a man-made landscape that  captures a shallow amount of water ...
Purpose of a Rain Garden• Captures runoff from impervious  areas such as roofs, driveways,  patios• Reduce runoff leaving ...
Benefits of Rain Gardens• Low maintenance, low water use,  beautiful landscape feature• Increases infiltration of rainwate...
Planning Your Rain Garden• Location• Size• Plant Mix
Location of the Rain Garden• At least 10 ft from a building  foundation• Near patio, driveways roads• Area that water will...
Locations to Avoid• Next to a building foundation• Over a septic system• Where water stands for long periods  already  –  ...
Rain Garden Size• Depends on  –   Area of drainage  –   Depth of ponding of rain garden  –   Soil and Slope of location
Deciding the Size• Figure out the size of  the area that will have  runoff going to the rain  garden• For a house, draw a ...
Soil Testing• Infiltration Test   –   Dig a hole 6-8 inches        deep and wide   –   Fill hole with water   –   If water...
Problem Soils• If soils are high in clay or have been  compacted during development, they  may not have the capacity to in...
Problem Soils• Ideal rain garden soil mix – 50-60%  sand, 20-30% topsoil, 20-30%  compost  –   No more than 10% of mix sho...
Deciding the Size• Sandy soils – 5-8% of runoff area• Clay soils – 10-15% of runoff area• Example – Area = 1800 sq.ft  –  ...
Deciding the SizeA rain garden on a steeper slope can  be smaller and deeper than a rain  garden on a flatter slopeMeasuri...
Installing the Rain Garden
Layout of Rain Garden• Rain gardens are usually not square  or a perfect circle• The long length should be  perpendicular ...
Layout of Rain Garden• Think about where excess storm  water will go• You cannot send your overflow onto  your neighbors p...
Installing the Rain Garden• Pointers   – Bottom of the rain garden should be level   – Top of berm should be about the sam...
Overflow Area• Always have an overflow method for larger storms   – Lower area in the berm somewhere   – Drain pipe within...
Connecting the Rain Garden• Create a shallow  wide swale or  bury a  corrugated drain  pipe to carry flow  from gutter int...
Installing the Rain Garden• Layout edge of rain garden with  rope or garden hose• Set aside the top 4-6 inches of  soil (t...
Installing the Rain Garden• Prepare the soil for planting   –   Add lime and fertilizer as recommended       by soil test ...
Plants• A wide variety of plants in both size texture  and color makes for an interesting rain  garden• Rain gardens can b...
Trees for Rain Gardens•   Red Maple      •   Sweetbay Magnolia•   River Birch    •   Dahoon Holly•   Crape Myrtle   •   Wi...
• River Birch• Bald Cypress                 Loblolly Pine
• Red Maple              Gingko
• Crape Myrtle                 Sweetbay Magnolia
Black Gum
Willow Oak• Winter King  Hawthorn
Shrubs for Rain Gardens• Winterberry   • American• Arrowwood       Beautyberry• Buttonbush    • Bottlebrush• Summersweet  ...
Deciduous Shrubs• Provide Seasonal Interest –   Flowers –   Berries –   Fall Color• More Natural Growth Form• Majority of ...
• Inkberry             Yaupon HollyArrow wood
Southern Wax Myrtle                      Bottlebrush                      Buckeye
Oakleaf Hydrangea    American    Beauty Berry
VirginiaSweetspire              Spice Bush                           Winterberry Buttonbush
Herbaceous Plants for RainGardens• Asters              •   Swamp Milkweed• Blackeyed Susan     •   Royal Fern             ...
Herbaceous Plants for RainGardens- Groundcovers• Shuttleworth      • Zoysia  ginger            • Liriope• Partridge berry ...
Canna Lilies St. Johns Wort   Ironweed
CinnamonFern           Swamp               Milkweed• Royal Fern
Asters          Joe Pye           Weed             Blackeyed SusanLiriope
Chasmanthium latifoliumNorthern Sea Oats
Miscanthus sinensis                                                         Silver GrassPhalaris arundinaceae    Ribbon Gr...
Plants to Avoid• Those Susceptible to Root Rots –   Most coniferous shrubs –   Azaleas –   Indian Hawthorn –   Camelias
Maintenance• No special maintenance required...• Routine periodic landscaping  maintenance –   Weeding –   Pruning –   Rep...
Credits•  Photos of Completed Rain Garden Examples courtesy of   City of Maplewood   http://www.ci.maplewood.mn.us/index.a...
GCES Recommended Resources• A Compilation of Low Maintenance Plants for   Georgia Landscapeshttp://pubs.caes.uga.edu/caesp...
Questions and  Thoughts
Deciding the Size• > 30 ft from gutter  –    include lawn area      between house and      rain garden for      sizing rai...
Upcoming SlideShare
Loading in …5
×

Georgia Rain Garden Manual

2,096 views

Published on

Georgia Rain Garden Manual

Published in: Self Improvement, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
2,096
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
2
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Georgia Rain Garden Manual

  1. 1. This presentation was created to provide property ownerswith an overview of rain garden construction that can beused to reduce the nonpoint source pollution coming fromtheir property.The design guides in this presentation represent generalguidelines for rain garden construction. To be eligible forthe stormwater utility credit, rain gardens must be designedaccording to the standards of the Georgia StormwaterManagement Manual and certified by a professionalengineer.As with any construction, property owners should contactAthens-Clarke County to determine permitting requirementsand address any other issues that may occur.
  2. 2. Build YourOwn RainGarden Rose Mary Seymour Engineering Extension Specialist CAES-Griffin Campus Ag Pollution Prevention Program Sponsored by P2AD of Georgia
  3. 3. What is a Rain Garden?• An area in a man-made landscape that captures a shallow amount of water and holds it for a short time period• Runoff water is captured and infiltrated into the soil in an indented area where plants and soils utilize and filter the water• An attractive addition to a landscape
  4. 4. Purpose of a Rain Garden• Captures runoff from impervious areas such as roofs, driveways, patios• Reduce runoff leaving landscape to become stormwater• Ponding should last no more than 48 hours after rain stops
  5. 5. Benefits of Rain Gardens• Low maintenance, low water use, beautiful landscape feature• Increases infiltration of rainwater in landscapes with impervious surfaces – - infiltrates as much as 30 % more water than a flat or sloped lawn area• Reduces flooding risks and stream bed destruction downstream• Different kind of habitat in the landscape
  6. 6. Planning Your Rain Garden• Location• Size• Plant Mix
  7. 7. Location of the Rain Garden• At least 10 ft from a building foundation• Near patio, driveways roads• Area that water will naturally move to –low area• Easy viewing from inside• Fitting into the rest of the landscape
  8. 8. Locations to Avoid• Next to a building foundation• Over a septic system• Where water stands for long periods already – High seasonal water table area• Inside the dripline of any large trees• Slopes greater 12%
  9. 9. Rain Garden Size• Depends on – Area of drainage – Depth of ponding of rain garden – Soil and Slope of location
  10. 10. Deciding the Size• Figure out the size of the area that will have runoff going to the rain garden• For a house, draw a footprint• Break whole roof into areas going to each gutter• Figure areas for each gutter
  11. 11. Soil Testing• Infiltration Test – Dig a hole 6-8 inches deep and wide – Fill hole with water – If water does not drain out of the hole in 12 hours, not a good location for a rain garden• Soil Chemistry Test – Take 2 cups of soil to the local county extension agent and have a soil test • Results will tell whether lime is needed to adjust pH and whether there is enough nutrients in the soil • $8 fee, takes about two weeks for results
  12. 12. Problem Soils• If soils are high in clay or have been compacted during development, they may not have the capacity to infiltrate well• The rain garden area soil can be removed and replaced with a better draining soil
  13. 13. Problem Soils• Ideal rain garden soil mix – 50-60% sand, 20-30% topsoil, 20-30% compost – No more than 10% of mix should be clay• Be careful of the nutrient content of composts…lower nutrient concentrations is better for the rain garden soil
  14. 14. Deciding the Size• Sandy soils – 5-8% of runoff area• Clay soils – 10-15% of runoff area• Example – Area = 1800 sq.ft – Sandy soil - .06 X 1800 = 108 sq.ft – Clay soil - .12 X 1800 = 216 sq.ft• If the area of the rain garden needs to be > 300 sq ft, consider making two smaller ones or bring in the earth moving equipment
  15. 15. Deciding the SizeA rain garden on a steeper slope can be smaller and deeper than a rain garden on a flatter slopeMeasuring Slope
  16. 16. Installing the Rain Garden
  17. 17. Layout of Rain Garden• Rain gardens are usually not square or a perfect circle• The long length should be perpendicular to the major slope• The shorter length should go down the major slope
  18. 18. Layout of Rain Garden• Think about where excess storm water will go• You cannot send your overflow onto your neighbors property• Local government has jurisdiction over land disturbing activities
  19. 19. Installing the Rain Garden• Pointers – Bottom of the rain garden should be level – Top of berm should be about the same elevation as the uphill edge of the rain garden
  20. 20. Overflow Area• Always have an overflow method for larger storms – Lower area in the berm somewhere – Drain pipe within rain garden
  21. 21. Connecting the Rain Garden• Create a shallow wide swale or bury a corrugated drain pipe to carry flow from gutter into the rain garden• Line swales with turfgrass or gravel to prevent erosion
  22. 22. Installing the Rain Garden• Layout edge of rain garden with rope or garden hose• Set aside the top 4-6 inches of soil (topsoil), excavate the hole then use the top soil to backfill the planting area.• Move the soil in the rain garden area down to the bottom edge of the rain garden
  23. 23. Installing the Rain Garden• Prepare the soil for planting – Add lime and fertilizer as recommended by soil test – Spread 2 to 4 inches of compost and mix or till it into the whole area of the rain garden• Now you are ready to plant
  24. 24. Plants• A wide variety of plants in both size texture and color makes for an interesting rain garden• Rain gardens can be designed to attract butterflies and birds with the right plant choices• Mix trees, shrubs, perennials, ornamental grasses and turfgrasses• Plants must be wet and drought tolerant – Really tough plants
  25. 25. Trees for Rain Gardens• Red Maple • Sweetbay Magnolia• River Birch • Dahoon Holly• Crape Myrtle • Winter King Hawthorn• Black Gum • Sugar Hackberry• Bald Cypress • Fringetree• Green Ash • Gingko• Willow Oak • Persimmon• Serviceberry • Loblolly Pine• Hornbeam
  26. 26. • River Birch• Bald Cypress Loblolly Pine
  27. 27. • Red Maple Gingko
  28. 28. • Crape Myrtle Sweetbay Magnolia
  29. 29. Black Gum
  30. 30. Willow Oak• Winter King Hawthorn
  31. 31. Shrubs for Rain Gardens• Winterberry • American• Arrowwood Beautyberry• Buttonbush • Bottlebrush• Summersweet Buckeye Clethra • Inkberry• Wax Myrtle • Oakleaf Hydrangea• Chokeberry • Virginia Sweetspire
  32. 32. Deciduous Shrubs• Provide Seasonal Interest – Flowers – Berries – Fall Color• More Natural Growth Form• Majority of Wetland Plants are Deciduous
  33. 33. • Inkberry Yaupon HollyArrow wood
  34. 34. Southern Wax Myrtle Bottlebrush Buckeye
  35. 35. Oakleaf Hydrangea American Beauty Berry
  36. 36. VirginiaSweetspire Spice Bush Winterberry Buttonbush
  37. 37. Herbaceous Plants for RainGardens• Asters • Swamp Milkweed• Blackeyed Susan • Royal Fern • Cinnamon Fern• Lobelia • Netted Chain Fern• Northern Sea Oats • Broad Beech Fern• Cardinal Flower • Canna Lilies • Yellow Flag Iris• Goldenrod • Rushes• Ironweed • St. Johns Wort• Joe Pye Weed • Foam Flower• Rose or Swamp • White Arrow Arum Mallow • Jack-in-the-Pulpit
  38. 38. Herbaceous Plants for RainGardens- Groundcovers• Shuttleworth • Zoysia ginger • Liriope• Partridge berry • Mondograss
  39. 39. Canna Lilies St. Johns Wort Ironweed
  40. 40. CinnamonFern Swamp Milkweed• Royal Fern
  41. 41. Asters Joe Pye Weed Blackeyed SusanLiriope
  42. 42. Chasmanthium latifoliumNorthern Sea Oats
  43. 43. Miscanthus sinensis Silver GrassPhalaris arundinaceae Ribbon Grass Festuca cinerea Silver Fescue Pennisetum alopecuroides Fountain Grass
  44. 44. Plants to Avoid• Those Susceptible to Root Rots – Most coniferous shrubs – Azaleas – Indian Hawthorn – Camelias
  45. 45. Maintenance• No special maintenance required...• Routine periodic landscaping maintenance – Weeding – Pruning – Replacing plants – Plant Division – Replacement of mulch
  46. 46. Credits• Photos of Completed Rain Garden Examples courtesy of City of Maplewood http://www.ci.maplewood.mn.us/index.asp?Type=B_BASIC& SEC={F2C03470-D6B5-4572-98F0-F79819643C2A}• Plant photos from Vegetation for Bioretention Areas, Allen Caldwell, CED, NC State CES or from Todd Hurt, GCES, Cherokee County and Gary Wade, GCES, Horticulture Specialist• Rain Gardens A How-to Manual for Homeowners University of Wisconsin Extension Pub #GWQ037http://clean-water.uwex.edu/pubs/raingarden/rgmanual.pdf• Intro Picture - Rain Gardens of West Michigan www.raingardens.org
  47. 47. GCES Recommended Resources• A Compilation of Low Maintenance Plants for Georgia Landscapeshttp://pubs.caes.uga.edu/caespubs/Agriculture/horticult ure/H-91-009.htm• Environmentally Friendly Landscape Practiceshttp://pubs.caes.uga.edu/caespubs/Agriculture/horticult ure/H-00-060.htm• Landscape Plants for Georgiahttp://pubs.caes.uga.edu/caespubs/pubcd/B625.htm• Soil Preparation and Planting Procedures for Ornamental Plants in the Landscapehttp://www.ces.uga.edu/pubcd/B932-w.htm• Soil Testing for Home and Gardenshttp://pubs.caes.uga.edu/caespubs/pubs/PDF/L387.pdf
  48. 48. Questions and Thoughts
  49. 49. Deciding the Size• > 30 ft from gutter – include lawn area between house and rain garden for sizing rain garden• < 30 ft to gutter – only the roof area needs to be included in sizing

×