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