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Curb cuts are a form of BMP [[Inlets|inlet]].  
 
Curb cuts are a 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?
 
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.
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As this inlet width is directly proportional to longitudinal slope; the required curb cut increases rapidly on steeper roads.  
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'''Standard width (450 mm), as included in OPSD drawings is often undersized for LID applications'''
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For reference, the OPSD collection of standard drawings includes:
 
</poem>
 
</poem>
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{| class="wikitable"
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|-
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!Flow direction
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!From asphalt catchment
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!From concrete catchment
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|-
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|30 - 45 deg
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|605.020 <ref name =OPSD>http://www.roadauthority.com/Standards/?id=b00e3771-6095-4257-b029-1d9879418039</ref>
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|605.010 <ref name =OPSD/>
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|-
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|90 deg
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|604.020 <ref name =OPSD/>
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|604.010 <ref name =OPSD/>
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|}
    
==Sizing==
 
==Sizing==
8,255

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