Difference between revisions of "Curb cuts"

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The proportion of water entering the bioretention cell under these flow conditions would be::
The proportion of water entering the bioretention cell under these flow conditions would be::
<math>R_c=1-\left ( 1-\frac{3}{9.71} \right )^{1.8}= 0.48,\ or\ 48\ %</math>
<math>R_c=1-\left ( 1-\frac{3}{9.71} \right )^{1.8}= 0.48</math>
 
48% of the 0.08 m<sup>3</sup/s flow would enter the bioretenteion cell through the inlet as designed.


==Curb cuts Gallery==
==Curb cuts Gallery==

Revision as of 01:23, 29 September 2017

Sizing[edit]

To completely capture linear flow travelling along a gutter perpendicular to a curb inlet, the inlet must be of width::

Where the intention is to capture only a proportion of the flow, the ratio of flow entering the curb inlet may be calculated::

Example[edit]

A curb cut of 3 m is proposed as an inlet for an offline bioretention cell receiving runoff from an adjacent roadway. The gutter and the curb are made from smooth concrete with Manning's 'n' = 0.013. The x-slope is 3% and the longitudinal slope of the road is 2%. The design storm produces flow of 0.08 m3/s.

The width of inlet to capture 100% of this flow is::

The proportion of water entering the bioretention cell under these flow conditions would be::

48% of the 0.08 m3</sup/s flow would enter the bioretenteion cell through the inlet as designed.

Curb cuts Gallery[edit]