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Looking Ahead:
NYC Green Infrastructure Program
Hudson River Foundation
September 19, 2016
2
NYC Water Quality Improvement Program
Data from Harbor Survey Program.
1985
Fecal Coliform Bacteria: < 100 cfu/100 mL 100 – 200 201 – 2,000 >2,000
2015
$10B investment since the early 2000s has yielded the highest water quality observed
in the NYC Harbor in recent history
3
NYC Green Infrastructure Program
4
Current GI Construction Timeline
5
GI Program Stats
• Over 3,800 GI assets built, mostly bioswales, managing over 400 impervious
acres
• Spent over $250 million towards the program in capital funding
• Over $900 million in capital budgeted through Fiscal Year 2025
Impervious Area CSO Reduction
Total
Impervious
Area (Ac)
Managed Area
(Ac)
% Imp. Area
Managed
Volume
Reduction
(MG/yr)
% Reduction
78,749 1,182 1.5% 507 2.4%
6
Scaling Up Green Infrastructure
www.nyc.gov/dep/gimap
7
Infiltration Considerations - Bedrock
Depth to Bedrock
8
Infiltration Considerations - Groundwater
Depth to Groundwater
9
ROW Siting Criteria
ROW Siting Criteria
challenges:
 Mature Trees
 Sidewalk widths (8’
or 5’)
 Fire Hydrants
 Pedestrian Ramps
 Building
Entrances/Exits
 Driveways
 Muni Meters/
parking meters
 Bus Stops
 Unfavorable
subsurface
conditions
 Utility conflicts
AdditionalAdditional
10
NYC Land Use Distribution
11
Looking Ahead: Program Shifts
1. Moving out of the streets and scaling up public and private properties
2. Developing new tools to overcome siting and design challenges
3. Considering long-term operations and maintenance costs
4. Diving into costs fluctuations and variability
5. Determining what is “cost-effective”
6. Aligning CSO and MS4 Program
Before After
12
Looking Ahead: The Green/Grey Balance
• ~30 Billion Gallons of CSO/Year
• NYC is required to complete 11 waterbody LTCPs, and one city-
wide LTCP
• Current obligated to spend an additional $3.3 Billion in grey
investments over already planned work
• Including large grey CSO storage planned in three waterbodies as
part of LTCP
• Currently, the NYC Consent Order has the CSO reductions in the
baseline, which doesn’t allow us to make decisions on a watershed
basis.
• GI costs per impervious acre managed can range from $400,000-
$900,000 depending on the various constraints we’ve
encountered.

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NYC Green Infrastructure Program

  • 1. Looking Ahead: NYC Green Infrastructure Program Hudson River Foundation September 19, 2016
  • 2. 2 NYC Water Quality Improvement Program Data from Harbor Survey Program. 1985 Fecal Coliform Bacteria: < 100 cfu/100 mL 100 – 200 201 – 2,000 >2,000 2015 $10B investment since the early 2000s has yielded the highest water quality observed in the NYC Harbor in recent history
  • 5. 5 GI Program Stats • Over 3,800 GI assets built, mostly bioswales, managing over 400 impervious acres • Spent over $250 million towards the program in capital funding • Over $900 million in capital budgeted through Fiscal Year 2025 Impervious Area CSO Reduction Total Impervious Area (Ac) Managed Area (Ac) % Imp. Area Managed Volume Reduction (MG/yr) % Reduction 78,749 1,182 1.5% 507 2.4%
  • 6. 6 Scaling Up Green Infrastructure www.nyc.gov/dep/gimap
  • 7. 7 Infiltration Considerations - Bedrock Depth to Bedrock
  • 8. 8 Infiltration Considerations - Groundwater Depth to Groundwater
  • 9. 9 ROW Siting Criteria ROW Siting Criteria challenges:  Mature Trees  Sidewalk widths (8’ or 5’)  Fire Hydrants  Pedestrian Ramps  Building Entrances/Exits  Driveways  Muni Meters/ parking meters  Bus Stops  Unfavorable subsurface conditions  Utility conflicts AdditionalAdditional
  • 10. 10 NYC Land Use Distribution
  • 11. 11 Looking Ahead: Program Shifts 1. Moving out of the streets and scaling up public and private properties 2. Developing new tools to overcome siting and design challenges 3. Considering long-term operations and maintenance costs 4. Diving into costs fluctuations and variability 5. Determining what is “cost-effective” 6. Aligning CSO and MS4 Program Before After
  • 12. 12 Looking Ahead: The Green/Grey Balance • ~30 Billion Gallons of CSO/Year • NYC is required to complete 11 waterbody LTCPs, and one city- wide LTCP • Current obligated to spend an additional $3.3 Billion in grey investments over already planned work • Including large grey CSO storage planned in three waterbodies as part of LTCP • Currently, the NYC Consent Order has the CSO reductions in the baseline, which doesn’t allow us to make decisions on a watershed basis. • GI costs per impervious acre managed can range from $400,000- $900,000 depending on the various constraints we’ve encountered.