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*''S<sub>x</sub>'' is the cross slope ratio (typically between 0.015 and 0.04)}}
*''S<sub>x</sub>'' is the cross slope ratio (typically between 0.015 and 0.04)}}
The value obtained for total inlet width can then be divided by a chosen number of inlets to determine the required width of each curb cut inlet. Curb cut inlets draining roadways should be a minimum of 0.45 m in width and are typically no wider than 1.5 m.
The value obtained for total inlet width (''W<sub>T</sub>'') can then be divided by the chosen number of inlets to determine the required width of each curb cut inlet. Curb cut inlets draining roadways should be a minimum of 0.45 m in width and are typically no wider than 1.5 m. The chosen number of inlets may be adjusted up or down to ensure individual inlet widths are within this range.
Where the curb cut width is constrained and a greater flow into the BMP is desired, the effective cross slope (''S<sub>x</sub>'') may be increased by adding a depressed concrete apron.
Where the available space for curb cuts is constrained and a greater flow into the BMP is desired, the effective cross slope (''S<sub>x</sub>'') may be increased by adding a depressed concrete apron.
Where 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 from the design storm event, the proportion of flow entering the curb inlet under such conditions 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>