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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 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.
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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:
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Where the intention is to capture only a portion of 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>
  

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