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Curb cuts are just one form of BMP [[Inlets|inlet]]. They are well suited to retrofit scenarios and to collect runoff from catchments with relatively gentle longitudinal slope, and/or a greater cross slope.
This might be the local topography of a parking lot or a piece of parkland?
As this inlet width is directly proportional to longitudinal slope; the required curb cut increases rapidly on steeper roads.
==Sizing==
==Sizing==
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<div style="float: right">
{{#widget:WolframAlpha|id=664012476f5d9635d57cd58920e763e6}}</div>
{{#widget:WolframAlpha|id=664012476f5d9635d57cd58920e763e6}}</div>
To completely capture linear flow travelling along a gutter perpendicular to a curb inlet, the inlet must be of width::
To completely capture linear flow travelling along a gutter perpendicular to a curb inlet, the inlet must be of width::
<math>W_T=0.817Q^{0.42}S_{0}^{0.3}\left (\frac{1}{nS_{x}}\right)^{0.6}</math>
<math>W_T=0.817Q^{0.42}S_{0}^{0.3}\left (\frac{1}{nS_{x}}\right)^{0.6}</math>
*''W'' is the available curb cut width (m)}}
*''W'' is the available curb cut width (m)}}
Where the curb cut width is constrained and a greater flow into the BMP is desired, the effective cross slope may be increased by adding a small depressed section.
Where the curb cut width is constrained and a greater flow into the BMP is desired, the effective cross slope may be increased by adding a depressed apron.
<math>
<math>