impervious

Design Specification No 7: Permeable Pavement

Design Specification No 7: Permeable Pavement

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.

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Design Specification No 1: Rooftop Disconnection

Design Specification No 1: Rooftop Disconnection

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.

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Technical Bulletin No 5: Design for High Intensity Redevelopment Projects

Technical Bulletin No 5: Design for High Intensity Redevelopment Projects

Managing the quality of stormwater runoff from redevelopment projects in highly urban watersheds can be complex and controversial.

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Technical Bulletin No 3: Implications of the Impervious Cover Model

Technical Bulletin No 3: Implications of the Impervious Cover Model

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.

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Urban Bioretention

Urban Bioretention

The Urban Bioretention design specification covers special bioretention applications in highly urban areas, including stormwater planters, expanded tree pits and stormwater curb extensions.

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Rooftop Disconnection Design Specification

Rooftop Disconnection Design Specification

Many designers feel the rules for disconnection are frequently abused and are not very effective for compacted soils.

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The Reformulated Impervious Cover Model

The Reformulated Impervious Cover Model

The reformulated ICM includes three important changes to the original model.

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