NYC Green Infrastructure Program

Transcription

1 NYC Green Infrastructure Program 2013 Green Infrastructure Annual Report Kevin Dahms, Assistant Director, NYC DEP Office of Green Infrastructure Pre-Release Briefing for DEC ENGS 44 Sustainable Design April 17, 2014 Thayer School of Engineering, Dartmouth College May 23, 2016

2 NYC Department of Environmental Protection Mission Statement The New York City Department of Environmental Protection (DEP) protects public health and the environment by supplying clean drinking water, collecting and treating wastewater, and reducing air, noise, and hazardous materials pollution. 2

3 What is a Combined Sewer Overflow? Dry Weather Conditions Stormy Weather Conditions Down Spout Down Spout Catch Basin Catch Basin Building Sewer Connection Combined Sewer Outfall Building Sewer Connection Combined Sewer Outfall City Sewer Main City Sewer Main Sewer Regulator Sewer Regulator 3

4 NYC Sewer System 7,400 total miles of sewers o 3,337 miles of combined sewer 14 Wastewater Treatment Plants Over 400 combined sewer outfalls 4

5 Water Quality in New York City Harbor = does not meet water quality standards (pathogens/do) 75% of Harbor meets pathogen standards for swimming 19% meets standards for boating and fishing 7% of our Harbor is made up of tributaries that do not meet secondary contact standards 5

6 What is Green Infrastructure? Green infrastructure (GI) practices are designed, constructed and maintained to collect stormwater runoff when it rains. Video 6

7 Green Infrastructure Program Timeline 2010 NYC Green Infrastructure Plan Laid framework to use green infrastructure to manage 1 of stormwater runoff from 10% of impervious surfaces in combined sewer areas by DEP Office of Green Infrastructure (OGI) is created to implement GI Plan 2012 Amended Consent Order DEP and NYS Department of Environmental Conservation (DEC) signed an historic agreement to incorporate a green and grey adaptive management approach into the CSO program. 7

8 GI Application Rates and Milestone Schedule DEP has committed to invest $1.5 billion in green infrastructure through % 9% 8% 7% 6% Initial 1.5% Additional 2.5% Additional 3.0% Final 3% 10% Target Manage 1 of stormwater runoff from 10% of impervious surfaces in combined sewer areas by % 4% 3% 2% 1% 0%

9 NYC Green Infrastructure Program City Sidewalks City Streets Grant Program for Private Property Public Property Retrofits 9

10 Right-of-Way Bioswale (ROWB) 10

11 Right-of-Way Bioswale (ROWB) 11

12 Stormwater Greenstreet (SGS) 12

13 Priority Areas and Area-wide Approach The Area-wide Approach allows OGI to: Focus resources on selected CSO tributary areas (Priority Areas) Saturate these CSO tributary areas with as much GI as practical Achieve efficiencies through standard designs, specifications and procedures 13

14 Hydraulic Calculations Site Selection Delineate ROW tributary drainage areas (TDA) upstream of existing catch basins in contract area. Calculate the 1 volume of stormwater runoff in each TDA. Determine the number of ROW green infrastructure practices to manage 1 volume. 14

15 Site Selection Site Walkthroughs DEP staff walks each area with design consultant, NYC Parks and Recreations, and NYC Department of Transportation to locate potential sites for green infrastructure. Sites must meet requirements for all agencies. 15

16 Site Selection Standard Geotechnical and Survey Procedures DEP has developed standard procedures for performing geotechnical investigations. Consultants complete soil borings and permeability tests at all selected locations Conduct Limited GI Survey for all practices that pass geotechnical investigations 16

17 Site Selection Geotechnical Investigations 17

18 Design NYC DEP Standards for Green Infrastructure Received NYC Public Design Commission (PDC) approval and officially released on August 16, 2012 Received PDC Excellence in Design Award in July 2013 Standards include ROWB designs, details, and planting plans Using these standards, DEP has constructed over 1,000 ROW GI practices to-date. An additional 1,600 ROW GI practices are currently in construction in Queens, Brooklyn, and the Bronx. 18

19 Design NYC DEP Standards for Green Infrastructure 19

20 Design NYC DEP Standards for Green Infrastructure 20

21 Design Standard Contract Plan Template 21

22 Construction Package 1 Package 3 Package 2 22

23 Before 23

24 After 24

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33 Design Updates and Lessons Learned Using adaptive management strategies, DEP updates the standards and procedures to improve performance, durability, efficiency, and capacity of ROWBs. Recent updates include: Variable size ROWBs Stormwater retention chambers Updated header support design for concrete headers Updated planting plans Permeable pavement gutter between inlet and outlet 33

34 Challenges and Advantages of Standardization Intensive startup effort. Must develop relationships with relevant agencies. May be issues working with different versions of standards across multiple contracts. Unexpected field conditions during construction Construction Map Designs and procedures are consistent across all contracts. Makes processes more efficient: Siting potential locations Performing geotechnical investigations Creating contract plans Bidding construction contracts Constructing GI practices Maintaining the GI practices 34

35 Public Property Retrofits 35

36 Public Property Retrofits Before 36

37 Walkthroughs 37

38 Schematic Design Final Design 38

39 Public Property Retrofits Before 39

40 Public Property Retrofits After 40

41 Public Property Retrofits Before 41

42 Public Property Retrofits After 42

43 GI Grant Program 43

44 GI Grant Program

45 GI Grant Program Before 45

46 GI Grant Program After 46

47 GI Grant Program Before 47

48 GI Grant Program After 48

49 Next Steps for NYC DEP DEP is developing standard details and design procedures for pervious pavements, bioinfiltration, and other site-specific practices. Bioinfiltration Stormwater Greenstreets Pervious Pavements 49

50 Contact Information Kevin Dahms Assistant Director NYC Department of Environmental Protection Office of Green Infrastructure Phone: (718)