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:


	New	Creates a new row in the table.
	Delete	Deletes the currently highlighted row from the table.
	Report	Opens a print preview window containing a report that details the input data for this dialog box.

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.