Architecture
Types of Roof Garden & Green Infrastructure
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Updated:3/7/2026
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Green Infrastructure Type↕ | Category↕ | Growing Medium Depth↕ | Notable Example↕ | Known For↕ |
|---|---|---|---|---|
Intensive Green Roof | Rooftop | 15-100+ cm (deep soil) | ACROS Fukuoka, Japan (terraced building) | Full gardens with trees, shrubs, walkways, requires heavy structural support, accessible to people, higher maintenance cost |
Extensive Green Roof | Rooftop | 5-15 cm (shallow substrate) | Ford Rouge Plant, Dearborn, Michigan | Lightweight sedum/moss mats, minimal maintenance, stormwater retention, 10.4-acre Ford roof is largest in North America |
Living Wall (Green Wall) | Vertical | Modular panels / felt pockets | Musée du quai Branly, Paris (Patrick Blanc) | Patrick Blanc pioneered vertical gardens, 15,000 plants on museum facade, air filtration, dramatic visual impact, hydroponic fed |
Rain Garden (Bioretention) | Ground-level | 45-90 cm engineered soil | Portland, Oregon citywide program | Depressed gardens capturing stormwater runoff, filter pollutants naturally, Portland has 3,000+ rain gardens reducing sewer overflow |
Bioswale | Ground-level / linear | 30-60 cm planted channel | SW 12th Avenue, Portland (first US green street) | Vegetated drainage channels slowing and filtering stormwater, linear design along roads, 90% pollutant removal, cheaper than pipes |
Permeable Pavement | Ground surface | Base layer 30-60 cm gravel reservoir | Cira Green, Philadelphia (elevated park on porous surface) | Allows rain to infiltrate rather than run off, reduces flooding, porous concrete/asphalt or interlocking pavers, needs vacuuming |
Constructed Wetland | Water treatment | 30-60 cm water depth | East Kolkata Wetlands, India | Engineered marsh systems treating wastewater naturally, 12,500 hectares in Kolkata treat city sewage, fish farming in treated water |
Urban Food Forest | Community | Full soil profile (in-ground) | Beacon Food Forest, Seattle | 7-acre public food forest with free fruit/nuts/herbs, permaculture design, 7 layers of edible plants, community-managed since 2012 |
Green Corridor / Greenway | Linear park | Varies (full soil to engineered) | High Line, New York City | Elevated park on abandoned rail line, sparked global 'rails-to-trails' movement, $2B in development along route, 8M visitors/year |
Tree Trench / Silva Cell | Below-grade | 90-120 cm modular soil cells | Various US city streetscapes | Underground modular soil containers under pavement, gives street trees rooting volume, captures stormwater, prevents root-pavement conflict |
Pocket Park / Parklet | Small-scale urban | Containers / raised beds | Paley Park, NYC (1967, first pocket park) | Tiny urban green spaces in unused lots or parking spaces, Paley Park's waterfall blocks traffic noise, tactical urbanism movement |
Detention Pond (Wet) | Stormwater | 1-3 m permanent pool | Various suburban developments | Permanent pond collecting stormwater, settles sediment and pollutants, often doubles as amenity/habitat, requires mosquito management |
Blue Roof | Rooftop | 5-15 cm detained water layer | Javits Center expansion, NYC | Roofs designed to temporarily hold rainwater and release slowly, reduces peak stormwater flow, can combine with green roof (blue-green roof) |
Floating Wetland | Water body | Floating mat (no soil depth) | Baltimore Inner Harbor, Chicago River | Buoyant planted mats on lakes/rivers, roots dangle into water absorbing nutrients, improve water quality, create fish habitat, aesthetic |
Vertical Farm / Indoor Growing | Indoor / vertical | Hydroponic/aeroponic (no soil) | AeroFarms, Newark, NJ | Stacked indoor growing using LED lights, 390x more productive per square foot, no pesticides, 95% less water, year-round production |
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