Defining Manning’s n vs. Depth Curves
You can define the roughness type for a conduit or a channel by creating a Manning’s n vs. Depth curve. You define the curve for a channel in the Property Editor for the connecting cross section node.
To define a Manning’s n vs. Depth curve for a conduit or a channel:
- Display the Property Editor for the link element:
- For a conduit, click the conduit in your model, or right-click the conduit and select Properties from the shortcut menu.
- For a channel, click the connecting cross-section node in your model, or right-click the channel and select Properties from the shortcut menu.
- In the Physical section of the Property Editor, select Manning’s n - Depth Curve as the Roughness Type. The Manning’s n-Depth Curve field becomes available.
- Click the Ellipses (...) button next to the Manning’s n - Depth Curve field.
- In the Manning’s n - Depth Curve dialog box, each row in the table represents a depth value and its associated Manning’s n roughness value. For each row in the table, perform the following steps:
- Type the depth in the Depth column, then press the Tab key to move to the Manning’s n column.
- Type a value in the Manning’s n column or click the Ellipses (...) button in the column to display the Material Libraries in the Engineering Libraries.
- Click the plus signs to expand the Material Libraries, then select the desired material and click the Select button. The Manning’s n roughness value associated with the selected material appears in the table. You can edit the values of a minor loss type in the Engineering Libraries in the Editor pane.
- Click the New button to add a row to the table.
- Repeat Steps 4 and 5 for each new row of values in the table.
- Perform the following optional steps:
- To delete a row from the table, select the row then click Delete.
- To view a report on the curve, click Report.
- Click OK to close the dialog box and save the curve data in the Property Editor.
Manning’s n–Depth Curve Dialog Box
This dialog box lets you define a Manning’s n vs. Depth table for conduits and channels. The dialog box contains the Depth vs. Manning’s table and the following buttons:
The table contains the following columns:
Column | Description |
---|---|
Depth | Lets you define the depth of the depth vs. Manning’s curve point. |
Manning’ n | Lets you define the roughness value at the specified depth in the Depth vs. Manning’s table. |
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