Retention Alleys

Retention alleys are typically located upstream of vulnerable low-lying areas. In these streets the impermeable street surface is replaced with a permeable surface that allows for slower absorption and subsurface storage before connecting to a storm sewer. Usually maintain a vehicle-oriented roadway.

Primary Benefits

● Safe, Clean Waters

Secondary Co-Benefits
●  Smaller-Scale Flood Reduction

● Beautification & Community Pride

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Green Highways

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Green Alleys