You can directly associate a user-defined unit hydrograph to any node element (e.g. manhole, catchment, cross section, pressure junction) for runoff calculations.

To add a user defined hydrograph to a catchment:

1. Click a node in your model to display the Property Editor, or right-click a node and select Properties from the shortcut menu.
2. In the Runoff section of the Property Editor, select User Defined Hydrograph as the Runoff Method.
3. Click the Ellipses (...) button next to the Runoff Hydrograph field. The User Defined Hydrograph dialog box appears.
4. Click the New button to add a row to the Time vs. Flow table.
5. Enter Time vs. Flow data into the table. Press Enter after typing a value to add a new row to the table (or click the New button to add a new row).
6. To insert a row at a time in between two other times, simply insert at the bottom of the table. When you close the table then reopen it, the row will be in the correct position. Time and flow units must be consistent with time and flow units used throughout the model.
7. Click the Graph button to view a plot of the Time vs. Flow data.
8. Click OK to close the dialog box and add the hydrograph to the Property Editor for the node.

User Defined Hydrograph Dialog Box

This dialog box allows you to define Time vs. Flow unit hydrographs.

The dialog box contains the time-vs.-flow table and the following buttons:

The table contains the following columns: