Network Selection
The program will show this screen whenever a command asking you to select a
pipenetwork:
screen you can select the network name and then clicking the OK button, or by double-clicking on the name.
If you are not sure which network you want to calculate, you can still click the button 
To select directly on the screen.
In this case, click a pipe or structure of the network you want and it will be selected in the screen above.
Finally click OK.
By default, the network has no definition of network type.
They will only be drainage networks when associating an area of contribution to a structure.