Green Alleys

Green alleys are typically located upstream of vulnerable low-lying areas. In these streets there should be a retention volume established and detention to slow the peak flow of water reducing flooding downstream. Detention streets allow slowed conveyance and possible retention through stormwater planters, hardscape channels, and permeable paving. These alley types often prioritize multimodal use or even prohibit cars.

Primary Benefits

● Safe, Clean Waters

Secondary Co-Benefits
●  Smaller-Scale Flood Reduction

● Green Space Access & Recreation

● Beautification & Community Pride