DWIGHT 2: COMPLETE STREET Exchange Street ~30 ft. tall trees
Rain garden
5’
5’
20’
15’
5’
A chicane pattern provides extra growing space for larger trees along the western side, while overall narrowing of the street significantly reduces impervious surface area. Approximately 30 ft. tall trees on the western side take advantage of the available space above ground, while bumpouts, structural soils, and permeable sidewalks and parking spaces provide sufficient growing space and stormwater capture below. Waterproof lining and overflow pipes prevent potential infiltration issues near buildings. Smaller trees (<15 ft. tall) line the eastern side underneath the overhead wires, and provide stormwater catchment in the same way as on the western side. Available space on the northeastern side allows for a small rain garden where water can infiltrate into the ground.
On-street parking
Narrowed vehicle entries at both ends of the street and a chicane pattern slows traffic, defines on-street parking spaces, and shortens crosswalks.
Number of new trees: 18 Amount of reduced impervious surface area: a) Road surface: 935 sq. ft. (11%) b) Including permeable parking/sidewalks: 4,640 sq. ft. (41%) Runoff reduction: 2,255 gallons per 1,3 in rain event (26%) 76,339 gallons per year (26%)
Narrowed entry
School Street
CHICOPEE GREEN STREETS DESIGNS
59