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Green Infrastructure Retrofits on Private Land
New York City Soil & Water Conservation District
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Source: NASA via Flickr user, Flatbush
Gardener: http://www.flickr.com/photos/flat
bushgardener/1877578094/
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NYC GI Plan
• Only in CSO areas • Right-of-Way bioswales • Interagency collaboration &
coordination • Green Infrastructure Grants Program • Greenroof Tax Abatement Program
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District’s GI Program • Implementation projects • Policies • Education and outreach • Partnerships
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W 83rd Street, Manhattan
BEFORE
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AFTER
PROJECT CONSTRUCTED June, 2010
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LID MAXIMUM STORAGE VOLUME = 900 gallons
STORMWATER FALLING ON 4,000SF IMPERVIOUS ROOF CATCHMENT AREA WITHOUT LID DURING ONE-INCH STORM
= 2,493 gallons
% OF STORMWATER DETAINED DURING ONE-INCH STORM = 36%
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W150th Street, Manhattan
BEFORE
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AFTER
PROJECT CONSTRUCTED July, 2010
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LID MAXIMUM STORAGE VOLUME = 4,040 gallons
STORMWATER FALLING ON 2,648SF IMPERVIOUS ROOF CATCHMENT AREA WITHOUT LID DURING ONE-INCH STORM = 1,651 gallons
% OF STORMWATER DETAINED DURING ONE-INCH STORM = 100%
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Prospect Ave, Bronx
BEFORE
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AFTER
PROJECT CONSTRUCTED August, 2011
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Wetland Planter Storage = 300cf
Roof Catchment Area = 3,600sf
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STORMWATER FALLING ON 3,600SF IMPERVIOUS ROOF CATCHMENT AREA WITHOUT LID DURING ONE-INCH STORM
= 2,244 gallons
LID MAXIMUM STORAGE VOLUME = 3,638 gallons
% OF STORMWATER DETAINED DURING ONE-INCH STORM
= 100%
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Feed line to wetland planters
Low-flow return line to sewer
Overflow return line to sewer
Feed line from roof downspout
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Home Street, Bronx
BEFORE
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AFTER
PROJECT CONSTRUCTED May 2014
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HOME STREET
PVC DRAIN
TREADLE PUMP
RAIN BARRELS
PLANTING BED
PLANTING BEDS
RETENTION STORAGE TANK
PLANTERS
EXISTING GRATE
SPIGOT CONNECTED TO RAIN BARRELS
DRAIN INSIDE PLANTING BED
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STORAGE VOLUME CAPACITY = 795 GALLONS 1” STORM MANAGED = 70%
RAIN BARREL SCHEMATIC TOTAL CATCHMENT AREA = 1,820 SF
TOTAL RUNOFF FROM 1” STORM = 1,135 GALLONS
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• Limited opportunities • Difficult access • Harsh environmental conditions • Bureaucracy • Residents’ involvement • Maintenance
Challenges
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GI Policies
• Coalition & partnerships • Policy analyses • Public participation
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GI Outreach & Education
• Tours of GI sites • Workshops • School visits • Educational materials