Calculator

Roof Drains to Raingardens at All Downspouts:

Half of Lawn Replaced by Garden with Native Landscaping:

Porous Pavement used on Driveway, Sidewalk and other non-street pavement:

Green Roofs:

Provide Tree Cover for an Additional 25% of Lot:

Use Drainage Swales instead of Stormwater Pipes:

Select a scenario:

Is this an existing site:
(If clicked no construction costs included)

Total size of site:

acres

Number of lots:

Average Roof Size, including Garage:

ft.²

Average Number of Trees on Lot:

Average Driveway Area:

ft.²

Average Impermeable patio, deck, alley or parking lot:

ft.²

Sidewalk Width:

ft.

Average Street Width:

ft.

Soil Type:

Average Slope:

Real Discount Rate:

Life Cycle in Years:

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Original Green Values Calculator