Rainwater Rewards
green infrastructure benefits calculator

about this tool
1. Choose location
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Street address:
City:
State:
Zip:
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Selected coordinates: [none; click on map to select]
Could not find the CENSUS block associated with the provided coordinates;
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The CENSUS BLOCK associated with the selected address or coordinates is not in our database.
Try a different location selection option.
Selected location:
Stormwater runoff per rain event
Drainage area (acres)
% impervious area
Impervious area (acres)
Amount of rainfall (inches)
Stormwater runoff per event (ft3)
Other location-specific parameters
% canopy cover
Average annual rainfall (inches)
Soil group
Value calculation parameters
TSS pollution coefficient (mg/L)
Phosphorus pollution coefficient (mg/L)
Discount rate (%)
Scenario length (years)
In the selected location, buildings, pavement, and other impervious surfaces lead to ft3 of runoff each year. To reduce this runoff, add green infrastructure in step 2 below.

2. Add green infrastructure
(i) you can add multiple; just select again!
Area (ft2)
Area draining into natural area (ft2)
Volume draining into natural area (ft3)
> Advanced settings
Drainage area that is impervious (%)
Number
Area draining into cistern (ft2)
Volume draining into cistern (ft3)
> Advanced settings
Rain barrel cost ($)
Drainage area that is impervious (%)
Average rainfall per event (in)
Annual rainfall per event (in)
Volume per cistern (gallons)
Total storage volume (ft3)
Green roof surface area (ft2)
Area draining onto green roof (ft2)
Volume draining onto green roof (ft3)
> Advanced settings
Will roof be installed on a LEED-certified building?
Installation cost ($/ft2
Drainage area that is impervious (%)
Depth of soil media (ft)
Porosity of soil media (%)
Volume provided in soil media (ft3)
Depth of drainage layer (ft)
Porosity of drainage layer (%)
Volume provided in drainage layer (ft3)
Depth of ponding above surface (ft)
Volume provided in ponding layer (ft3)
Total volume provided (ft3)
Basin surface area (ft2)
Area draining into basin (ft2)
Volume draining into basin (ft3)
> Advanced settings
Installation cost ($/ft2
Drainage area that is impervious (%)
Depth of soil media (ft)
Porosity of soil media (%)
Volume provided in soil media (ft3)
Depth of drainage layer (ft)
Porosity of drainage layer (%)
Volume provided in drainage layer (ft3)
Depth of ponding above surface (ft)
Volume provided in ponding layer (ft3)
Total volume provided (ft3)
Volume treated (ft3)
Area of porous pavement (ft2)
Area draining onto pavement (ft2)
Volume draining onto pavement (ft3)
> Advanced settings
Installation cost ($/ft2
Area required to capture all runoff (ft3)
Depth of gravel bed (ft)
Porosity of gravel bed (%)
Total storage volume (ft3)
Garden surface area (ft2)
Area draining into garden (ft2)
Volume draining into garden (ft3)
> Advanced settings
Installation cost ($/ft2
Drainage area that is impervious (%)
Depth of soil media (ft)
Porosity of soil media (%)
Volume provided in soil media (ft3)
Depth of drainage layer (ft)
Porosity of drainage layer (%)
Volume provided in drainage layer (ft3)
Depth of ponding above surface (ft)
Volume provided in ponding layer (ft3)
Total volume provided (ft3)
Percent reduction (%)
Number
Tree size:
> Advanced settings
Installation cost ($/planter)
Area reduced per tree (ft2)
Total impervious area reduced (ft2)
Infrastructure capacity (ft3): --
Runoff reduced per rainfall event (ft3): -- of --
Runoff reduced (%): --
Runoff reduced per year (ft3) : --

3. View summary
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Type Size Runoff reduced Return on investment
Stormwater reduced per year: Return on investment:
Years to payoff:
Phosphorus pollution reduced: TSS pollution reduced:
X