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Save the Rain Green Improvement Fund Update and Stormwater Management Model (SWMM) Briefing for GIF design professionals and applicants.
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Onondaga County’s Green Infrastructure Program
Green Improvement Fund (GIF) Public Information Meeting
Tom Rhoads, Madison Quinn, Paul Legnetto
OCDWEP
Bj Adigun, Matthew Marko CH2M HILL
May 30, 2013
Joanne M. Mahoney, County Executive Onondaga Lake Amended Consent Judgment (ACJ) Compliance Program
5/30/13
2 Balanced Approach to CSO Abatement
Regulatory Goals • Capture and Treat 95% of the
Annual CSO Volume via Gray & Green Infrastructure
• Achieve water quality standards in tributaries and lake
Community Impacts/Goals • Improve quality of life through
environmental responsibility
• Promote sustainability
• Ensure cost effectiveness in compliance with ACJ milestones
• Community revitalization
Major Milestones • 89.5% capture/elimination by 12/31/2013
• 95% capture/elimination by 12/31/2018
5/30/13
3
• 100+ projects completed or under construction • 100+ million gallons runoff captured annually • Signature projects:
▫ OnCenter Green Roof ▫ War Memorial Reuse System ▫ HB Wetland ▫ Library Projects ▫ Vacant Lot Initiative ▫ Urban Forestry & Rain Barrel Programs
• Green Improvement Fund Program
Save the Rain Program Highlights
5/30/13
4 Green Program Update
Courts-4-Kids
City Lot # 4
Connective Corridor
Townsend Parking Lot B
Urban Forestry Program
Water Street Gateway
Pass Arboretum Park
Otisco Street
OnCenter Green Roof
5/30/13
5 GIF Program Highlights • Program Statistics
▫ 117 applications submitted for grant funding to-date
▫ 36 grant awarded projects completed ▫ 54 projects under contract for 2013 construction
season ▫ 10 applications currently being evaluated and
finalized (Note: 17 applications failed to receive grant funding)
▫ For those Projects Completed: ▫ 14.2 Million Gallons removed from combined
sewers (annually)
5/30/13
6 GIF Program Projects
Dunbar Association
Copper Beech Commons
King & King Architects
Mister Lady Bug
Monroe Building
Jefferson-Clinton Commons
Hotel Skyler
5/30/13
7 GIF Program
The Green Improvement Fund (GIF) is a grant program to incentivize the development of green infrastructure stormwater mitigation techniques on private property
5/30/13
8 GIF Program To-Date • Program Evolution
▫ GIF 1.0 (March 2010) $3 million pilot program $100K funding limit per project/ $250K for multiple projects 25 applications submitted
▫ GIF 2.0 (June 2011) Full-program (pilot complete), expanded geography $200K funding limit per project Greater emphasis on gallon capture 60 applications submitted
▫ GIF 3.0 (July 2012) Funding limits eliminated Revised Program Description and streamlined Application Greater emphasis on efficiency in GI implementation 20 applications submitted
5/30/13
14
▫ USEPA developed publicly available software that estimates stormwater runoff within sewersheds
• Tracks individual CSO’s and drainage areas ▫ Evaluation method for measuring ACJ compliance ▫ Model updated in 2012
▫ The update included an upgrade to software version 5.0.022; the incorporation of the Low Impact Development (LID) module; and the inclusion of more accurate physical data, LIDAR topology, an aerial survey of imperviousness, USDA soil survey parameters, the 012‐2013 regulator weir survey, ArcHydro sub‐catchment delineation, intra‐sub‐catchment routing, and real time control (RTC) programming
▫ Models all system components in one model, including the benefits of storage systems
SWMM Analysis
5/30/13
15 Original Model Network - 2011 • 2 separate models with free
outfalls • HBIS: 3 pump stations (PS) • MIS: 1 PS, 1 RTF and EBSS
gates • Not geo-referenced • Used SWMM default
infiltration parameters • Imperviousness obtained by
visual interpretation of aerial photos
• Simplified wet weather operation controls
• Model network vs GIS trunk sewer alignments (shown as background)
Onondaga Lake
HBIS
MIS
5/30/13
16
Submitted as part of 2012 ACJ Annual Report
• One combined model with refined boundary conditions (Metro Headworks)
• 1,807 vs. 503 nodes; 1,909 vs. 577 conduits; and 456 vs. 94 subcatchments
• HBIS: 3 pump stations (PS) • MIS: 4 PS, 2 RTFs and modified
EBSS gates • Geo-referenced • Used USDA soil survey data • Imperviousness based on
Syracuse aerial survey GIS land cover and supplemented with Landsat imagery
• Improved wet weather operation controls
• Calibrated Creek/Brook tailwater conditions based on USGS stream gauges(
HBIS
MIS
Onondaga Lake
•Updated Model Network - 2012
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17
• Subcatchment Delineation with ArcHydro Procedures
• Imperviousness Characterization
• Infiltration Methodology
Surface Hydrology Onondaga
Lake
5/30/13
19 Incorporate Green Infrastructure Modeling (SWMM Low Impact Development [LID] Module)
Surface Layer
Soil Layer
Storage Layer
Underdrain
Evaportranspiration
Prec
ipita
tion
Infil
tr.
Bio-retention Cell
Overflow To Outlets
Drain To Outlets
Perc
. In
filtr
.
Runoff from other
Catchment Areas
5/30/13
22 Impact on GIF Successful projects implemented to date (Gray + Green),
and a better understanding of the system through SWMM, enables a more strategic approach to CSO abatement
▫ New program boundary based on updated SWMM • Site verification as necessary to confirm boundary conditions
▫ Strategic approach to GIF incentives ▫ Some CSO-sheds are successfully completed and will be eliminated ▫ For CSO’s that remain in program, proposed funding incentives will
be prioritized based on efficiency (High, Medium, Low) ▫ GIF submission and review procedures to remain unchanged
▫ Largely unchanged Program Description and Application, as well as new program Map available via STR website (www.savetherain.us)
▫ GIF award calculator spreadsheet will be made public and available during application development
5/30/13
23 GIF Calculator ▫ The GIF “calculator” is the tool where the business case for
grant funding is justified, evaluating runoff reduction and cost of work to determine a grant award amount
▫ Based on some basic site specific input data, the proposed runoff reduction is calculated, and has a monetary value (“volume based compensation”)
▫ Based on the proposed scope of work, combined with typical GI installation costs across the program area, the cost to complete the work is estimated
The applicant is awarded, on a line item basis, the lesser of the amounts (value for runoff reduction, vs. maximum cost of work)
5/30/13
24
Other items of interest: ▫ Funding for Green Roof projects is on par with porous
pavement systems ▫ Minimum project size of 60,000 gallons (runoff per year) ▫ Calculator can be used for “capture and slow release”
as well as “water reuse” systems* ▫ Calculator can be used for “green separation” projects* ▫ Some itemized “gray” items may be eligible for reimbursement
if they are required to facilitate the GI* ▫ Engineering compensation is a function of construction cost ▫ Field Testing has a maximum amount ▫ We no longer compensate for Structural Analysis
*consultation with WEP recommended
GIF Calculator
5/30/13
25 SWMM Impact on
GIF ▫ Proposed funding
per gallon runoff to remain at $0.30 for high priority areas*
▫ Proposed medium priority areas to receive $0.20/gallon
▫ Proposed low priority areas to receive $0.10/gallon
▫ Some CSOs eliminated from program
*$0.25 for projects over 500,000 gpy
DRAFT
DRAFT
5/30/13
26 Schedule ▫ Moratorium to end mid-June 2013 ▫ GIF projects under contract are not affected by moratorium ▫ GIF applications received but not under contract will be
evaluated using both old & new policy guidelines ▫ It will take approximately 25-30 days to process backlog
▫ New applications will be reviewed under new program guidelines
▫ New guidelines to remain in place for 6 month period ▫ Program to be closed to new applications at noon on
December 16, 2013 and re-evaluated ▫ SWMM update will be performed, including new
prioritization ▫ Goal is to re-open application process in Feb-March 2014
for upcoming construction season