This page of the wizard shows each of the inlets in the pipe network which contribute to the specified outfall and the associated catchments which have been defined for the inlets. You can use this page of the wizard to assign known Q and lane and gutter data for the inlet structures associated with the pipe network.
Only structures identified as inlets, and which contribute to the specified outfall, are shown on the Tributary Areas page.
If you have not created catchment areas for the inlet of the pipe network, this page will not contain catchment data. You can either cancel the wizard and create catchments for the inlets first, or you can define Known Q values for each inlet instead.
- Apply Defaults to Empty Fields Only
- Applies the default settings to only the empty fields on the page when you click Apply Default Settings.
- Apply Defaults to All Fields
- Applies the default settings to all fields on the page when you click Apply Default Settings.
- Apply Default Settings
- Applies the default Tributary Areas settings to either all fields or to the empty fields only.
Data Table
You can enter data into the table manually or by applying the settings using the options described above.
To edit multiple rows in a column, hold down the Ctrl or Shift keys when selecting the rows and then keep the Shift key pressed when you click the column. If one or more of the selected items in a column is not editable (shown with a gray background), then multiple-row editing is not enabled.
with a tooltip is displayed in a column if the value needs to be adjusted.
- Inlet Structures
- Displays each of the inlet structures in the pipe network which contribute to the specified outfall.
- Catchment Areas
- Displays each of the catchment areas that are associated with each inlet structure.
Note: If catchments do not exist for the inlets, you can enter a Known Q for each inlet.
- 2D Areas
- Displays the 2D area of each catchment.
- Runoff Coefficient C
- Displays the runoff coefficient of each catchment.
- Time of Concentration Tc (min)
- Displays the time of concentration that was calculated for each catchment.
Note: If the Tc does not meet the default minimum Tc specified in the default Tributary Areas settings, an alert icon
is displayed in the Tc field to inform you that the default value will be used in the calculations. Using the Apply Defaults to All Fields option does not overwrite the existing Tc values that are shown in the data table; however, the minimum Tc from the settings is used in the calculations regardless of whether you apply the settings to the fields.
- Known Q
- Optional. Specifies other flow that is not accounted for through the catchment, or can be used to specify flow to an inlet if a catchment does not exist for it.
Note: If an inlet has no corresponding catchment, and its Known Q is 0, it will not be used in any analysis, and it will not be listed in the inlet analysis CSV table. Either a catchment or a valid Known Q value (larger than 0) must be assigned to the starting inlet.
- Road, Sx
- Specifies the road cross slope (slope of the road lane, measured perpendicular from the baseline). Enter this value as a decimal. For example, 2% slope would be entered as
.02. Enter the slope value as a positive number.
Tip: You can insert surface slope labels in the drawing to help determine what the road and gutter cross slope values are at each inlet location.
- Gutter, Sw
- Specifies the gutter cross slope (slope of the gutter, measured perpendicular from the baseline). Enter this value as a decimal. For example, 2% slope would be entered as .02. Enter the slope value as a positive number.
- Gutter Width
- Specifies the gutter width.
- Longitudinal Slope
- Specifies the longitudinal slope (parallel to the baseline) along the gutter line.
- Gutter n Value
- Specifies the Manning's n value of the gutter.