Curb cuts

Sizing

To completely capture linear flow travelling along a gutter perpendicular to a curb inlet, the inlet must be of width:: $W_{T}=0.817Q^{0.42}S_{0}^{0.3}\left({\frac {1}{nS_{x}}}\right)^{0.6}$

Where the intention is to capture only a proportion of the flow, the ratio of flow entering the crub inlet may be calculated:: $R_{c}=1-\left(1-{\frac {W}{W_{T}}}\right)^{1.8}$

Curb cuts Gallery

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  Curb cut used as a controlled overflow route from permeable paving to a bioretention facility with monitoring well, Lake Simcoe Region Conservation Authority, Newmarket, ON

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  Curb cut into a bioretention facility in Hinsdale, IL.
  Decorative aggregate in the center of the facility reduces erosion and dissipates power inflow around the inlet area. A monitoring/maintenance well can be seen in the foreground.
  Photo credit: CNT

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  Curb cut into a bioretention facility in Brown Deer, WI.
  Aggregate is used to reduce erosion around the inlet area.
  Photo credit: Aaron Volkening

An alternative practice to traditional impervious pavement, prevents the generation of runoff by allowing precipitation falling on the surface to infiltrate through the surface course into an underlying stone reservoir and, where suitable conditions exist, into the native soil.

A shallow excavated surface depression containing prepared filter media, mulch, and planted with selected vegetation.

A broad category of particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in various particulate size gradations.

A broad category of particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in various particulate size gradations.