Nojaim’s Grocery Addition
Syracuse, NY
2014
A GIF Project
The Project
• 4500 sf addition
• Reconfigured entrance
• Reconfigured parking
Apply for GIF Reimbursement
The Evolving GIF
The Evolving GIF
2013
2010
The Evolving GIF
2010:
Up to 100% of the costs of GI solutions above and beyond traditional construction
($20,000 to $250,000)
2013:
Lesser of GI unit costs and gallons captured based on priority location
($0.10 to $0.30 / gal)
Choosing The Practices
Choosing the Practices:
Got Permeability?
Geo‐tech Evaluation
Sand
Drainage Areas
Existing
Proposed
Pre and Post Hydrology
Choosing the Practices:
GIF Practice Options
Choosing the Practices:
LEEDS?
The Choices
• Permeable Pavement (1500 sf)
• Tree Planting (18)
• Underground Infiltration (1650 sf)
• Underground Infiltration (6200 sf)
Underground Infiltration
Tree Planting
Porous Pavement
Sizing the Practices
*“First Flush”
– also know as the Water Quality Volume = 90% of all the runoff on a site*
*or 1 yr runoff for impaired watersheds
Storage Volume:
#1 Infiltration Chambers :
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AI= 13,500 sf.
WQv = 960 cf
Storage Volume provided = 1830 cf
#2 Infiltration Chambers :
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Ai= 52,500 sf.
WQv = 3740 cf
Storage Volume provided = 8150 cf
Perm Pavement:
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AI= 1500 sf.
WQv = 107 cf.
Storage Volume provided = 300 cf.
Tree Planter/ tree
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AI= 50 sf
WQv = 5 cf.
Storage Volume provided/tree = 9 c.f.
Hydrology Routing
Hydrology
Computing GIF Rainfall Capture
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Total Annual Syracuse Rainfall = 39.34”
Water Quality Volume = 90% of all rainfalls
Practice Efficiency = 80% ( reality)
Percent of total rainfall captured = 72%
or
28.3” of annual rainfall captured/sf of DA impervious surface
1,218,000 gal/yr
Estimated GI Costs
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Infiltration Tests = $5000
Engineering = $ 32,000
Infiltration Chambers = $197,000*
Permeable Pavement = $12,000 Tree Planting = $6,000
Total GIF Request = $252,000
* Includes parking lot reconstruction costs
The 2013 GIF Calculator
Calculating the GIF Reimbursement:
Maximum = $0.25/ gal captured
Soft Cost Reimbursement
$26,000 total
Funding Limits Based on Capture
$ 0.25/gal x 1,218,000 gal captured = $304,000 Funding Limits Based on Unit Costs
$222,150
Check against $.25 max capture rate
The Difference
The Bottom Line
vs $ 252,000 request
Maintenance
Infiltration System Porous Pavement
Tree Planter
Upon Project Completion:
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Actual Cost Documentation
Engineer’s Certification
Record Drawings
Maintenance Agreement