Permeable pavement is typically designed to treat stormwater that falls on the actual pavement surface area, but it may also be used to accept run-on from small adjacent impervious areas, such as impermeable driving lanes or rooftops.
This strategy involves managing runoff close to its source by intercepting, infiltrating, filtering, treating or reusing it as it moves from the impervious surface to the drainage system.
Managing the quality of stormwater runoff from redevelopment projects in highly urban watersheds can be complex and controversial.
The Impervious Cover Model (ICM) was first proposed in 1994 as a management tool to diagnose the severity of future stream problems in urban subwatersheds.
The Urban Bioretention design specification covers special bioretention applications in highly urban areas, including stormwater planters, expanded tree pits and stormwater curb extensions.
Many designers feel the rules for disconnection are frequently abused and are not very effective for compacted soils.
The reformulated ICM includes three important changes to the original model.
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