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*''S<sub>0</sub>'' is the longitudinal slope ratio
*''S<sub>0</sub>'' is the longitudinal slope ratio
*''n'' is Manning's 'n' (between 0.012 and 0.016 for concrete, depending on surface treatment), and
*''n'' is Manning's 'n' (between 0.012 and 0.016 for concrete, depending on surface treatment), and
*''S<sub>x</sub>'' is the cross slope ratio}}
*''S<sub>x</sub>'' is the cross slope ratio (typically between 0.015 and 0.04)}}
Where the inlet width is constrained or the intention is to capture only a proportion of the flow, the ratio of flow entering the curb inlet may be calculated::
Where the intention is to capture only a proportion of the flow, the ratio of flow entering the curb inlet may be calculated::
<math>R_c=1-\left ( 1-\frac{W}{W_T} \right )^{1.8}</math>
<math>R_c=1-\left ( 1-\frac{W}{W_T} \right )^{1.8}</math>
*''R<sub>c</sub>'' is the proportion of flow entering the curb cut, and
*''R<sub>c</sub>'' is the proportion of flow entering the curb cut, and
*''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.
<math>
==Example==
==Example==