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To completely capture linear flow travelling along a gutter perpendicular to a curb inlet, the inlet must be of width::
To completely capture linear flow travelling along a gutter perpendicular to a curb inlet, the inlet must be of width::
<math>W_T=0.817Q^{0.42}S_{0}^{0.3}\left (\frac{1}{nS_{x}}\right)^{0.6}</math>
<math>W_T=0.817Q^{0.42}S_{0}^{0.3}\left (\frac{1}{nS_{x}}\right)^{0.6}</math>
{{Plainlist|1=Where:
*''W<sub>T</sub>'' is the width of the inlet in m,
*''Q'' is the flow perpendicular to the inlet in m<sup>3</sup?/s
*''S<sub>0</sub>'' is the longitudinal slope
*''n'' is Manning's 'n' (between 0.012 and 0.016 for concrete, depending on surface treatment),
*''S<sub>x</sub>'' is the cross slope}}
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, the ratio of flow entering the curb inlet may be calculated::