Healthy Growth Calculator

Roads & Sidewalks
Sprawl	vs	Your Choice
		choose density or place
233,333		233,333
Square Yards per 1000 Households

Concrete or asphalt in roads and sidewalks. Paved surfaces create water pollution and require drilling, mining and transporting of gravel, cement and asphalt. Many studies show that water pollution skyrockets when more than 20% of the watershed is paved over and developed. Forty single family dwellings require 40 times as much concrete in roads and sidewalks as a 40-unit apartment building on a single lot. Water, sewer, electrical, phone, cable and other services lie under the street and branch off into each lot, so sprawl housing uses much more of these materials.

Extensive paving add to the "urban heat island" effect, worsening air pollution (NOx and hydrocarbons react to form ozone faster and more completely as temperature rises) and global warming.

Calculation assumes a 10 yard wide half-street and sidewalk along a 70 yard front for each 1 acre lot, or 700 sq. yards per residential acre.