Green Streets in Harbor Brook Sewershed


Project Description: The Green Streets in Harbor Brook Sewershed projects are comprehensive green street applications located on multiple streets within the Harbor Brook sewershed. CSOs 006, 007 and 009 are high priority sewersheds that discharge frequently during rain events. The candidate streets are listed below with capture area and runoff reduction estimates:

·   Lakeview Avenue (CSO 006) Capture Area: 37,448 sq. ft. Runoff Reduction: 661,174 gal/yr

·   Magnolia Street (CSO 009) Capture Area: 89,300 sq. ft. Runoff Reduction: 1,576,662 gal/yr

·   South Wilbur Avenue (CSO 009) Capture Area: 19,901 sq. ft. Runoff Reduction: 351,368 gal/yr

·   Richmond Avenue (CSO 007) Capture Area: 36,298 sq. ft. Runoff Reduction: 640,870 gal/yr

·   North Geddes Street (CSO 007) Capture Area: 10,988 sq. ft. Runoff Reduction: 194,002 gal/yr

This proposed project will incorporate infiltration trenches, rain gardens (also known as bioretention), and tree planting to manage stormwater from Lakeview Avenue, Magnolia Avenue, S. Wilbur Avenue, Richmond Avenue and North Geddes Street.

Infiltration trenches capture water in an underground stone trench located beneath a roadway. From there, it slowly infiltrates to groundwater. A rain garden is a depressed, vegetated area that receives stormwater runoff from adjacent paved areas. The runoff then infiltrates to groundwater or is released to the atmosphere through evapotranspiration.

When complete, these green streets will capture a total of 3,427,095 gallons of stormwater annually.

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