**Inlet Rating Curves** are used to -define a gutter approach flow versus captured flow rating curve.

*Gutter Flow*

Enter the surface flow (m3/s, ft3/s) approaching this inlet that corresponds to the captured flow in the adjacent column. The coordinates should start at zero although this is not mandatory, as the table will be extrapolated to predict any required value. The data also does not have to be entered in sequential increasing order since the data is sorted when OK or SORT is chosen.

*Captured** Flow*

Enter the inlet capture flow (m3/s, ft3/s) corresponding to the Gutter Flow in the adjacent column. If this value is greater than the Gutter Flow then all approach flow is captured.

Inlet Rating Curves may also be used to -define a gutter approach depth versus captured flow rating curve.

The data associated with the rating curve database may be accessed from either the Global Data menu or from a local node using the selection list function.

*Gutter **Depth*

Enter the surface depth (m, ft) at this inlet that corresponds to the captured flow in the adjacent column. The coordinates should start at zero although this is not mandatory, as the table will be extrapolated to predict any required value. The data also does not have to be entered in sequential increasing order since the data is sorted when OK or SORT is chosen.

The way in which the inlet depth is calculated depends on the status of the Calculate Gutter Spread flag. If the flag is checked then the depth is calculated according to the pavement crossfall characteristics

*Captured** Flow*

Enter the inlet capture flow (m3/s, ft3/s) corresponding to the Gutter Depth in the adjacent column.