The file for this example, Bendigo Trunk Drain Example - Lite.drn, is located in the folder C:\ProgramData\Drains among the Lite examples. If this folder is hidden, in File Explorer select the View tab and tick the Show Hidden Items box to make it visible.  

This system, shown below, involves pipe and channel links including a detention basin. Pipes connect into open channels via nodes. This capability of integrating varied components and systems is one of the most useful features of DRAINS.