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Australia: Sustainable Rain Gardens

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Australia: Sustainable Rain Gardens

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Australia: Sustainable Rain Gardens

  1. 1. Sustainable Gardens Rain GardensClick to edit Master subtitle style Madeline Laurenson & Pat Arundell © Rain Gardens Australia Pty Ltd 2010
  2. 2. What We’ll Cover Tonight • What is a Rain Garden •Why have a Rain Garden •How does a Rain Garden work •Design •Retrofit Case StudyClick to edit Master subtitle style •Questions © Rain Gardens Australia Pty Ltd 2010
  3. 3. A Rain Garden is • Sustainable • Low maintenance • Green • Good for environment • Water Sensitive Urban Design • Small ScaleClick to edit Master subtitle style • Make a difference (at home) © Rain Gardens Australia Pty Ltd 2010
  4. 4. What is a Rain Garden•Part of Stormwater System – downpipes,driveways•Part of Landscaping•Can be big – 30m2 or more•Can be small – 1 to 2 m2•Simplestedit Master subtitle style Click to form of Water Sensitive Urban Design(WSUD)•Treats Stormwater © Rain Gardens Australia Pty Ltd 2010
  5. 5. Click to edit Master subtitle style © Rain Gardens Australia Pty Ltd 2010
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  9. 9. Why Click to edit Master subtitle styleDiagramCourtesy ofMelbourne Water © Rain Gardens Australia Pty Ltd 2010
  10. 10. What’s so bad about stormwater? Chemicals – ie oil, grease Nutrients – ie fertilisers Physical contaminants Microbial pathogens (dog poo etc) Storm impacts Click to edit Master subtitle style Aesthetic contaminants © Rain Gardens Australia Pty Ltd 2010
  11. 11. Typical Gross Pollutants in Urban Stormwater Typical* Percentage by weight Man made materials eg 10Polystyrene, tennis balls, plastic bags, drink cans, newspapers, plastic bottles, litter, cigarette butts, syringes etc... Vegetative Material 60 Leaves, grass clippings, seeds, etc... Click to edit Master subtitle style Sediment Fine and coarse with attached hydrocarbons, heavy metals and nutrients 30 © Rain Gardens Australia Pty Ltd 2010
  12. 12. Not a Typical Aesthetic ContaminantClick to edit Master subtitle style © Rain Gardens Australia Pty Ltd 2010
  13. 13. Why Do It – Why a Rain Garden Why do it? Why a Rain Garden? Removal of N, P, fine Protect natural systems sediment, not rapid disposal Integrated landscaping Water efficient landscaping Removal of N, P, fine Protect water quality Click to edit Master subtitle style sediment Detention of stormwater, notReduce runoff and peak flows rapid disposal Add capital value Minimal development costs © Rain Gardens Australia Pty Ltd 2010
  14. 14. How Does a Rain Garden Work Click to edit Master subtitle style © Rain Gardens Australia Pty Ltd 2010
  15. 15. I Want One – What Now?• Where is the water coming from • Location • Proximity to buildings • Reactive soilsClick to edit Master subtitle style • New development or retrofit © Rain Gardens Australia Pty Ltd 2010
  16. 16. I Want One – What Now? • Garden size / location • Plant selection • Soil characteristics / mulch • Depth (ponding & detentionClick to edit Master subtitle style time) • Aggi pipe size • Overflow © Rain Gardens Australia Pty Ltd 2010
  17. 17. Design• What works – Get design early • What doesn’t – leaving design as add on • Caution – retrofitsClick to edit Master subtitle style © Rain Gardens Australia Pty Ltd 2010
  18. 18. retrofit pictures (tips for the unwary)Click to edit Master subtitle style © Rain Gardens Australia Pty Ltd 2010
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  24. 24. Click to edit Master subtitle style © Rain Gardens Australia Pty Ltd 2010
  25. 25. Rain Gardens becauseGardens that clean are green Click to edit Master subtitle style www.raingardens.com.au sustain@raingardens.com.au © Rain Gardens Australia Pty Ltd 2010

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