In this exercise, you will add to your pipe network by creating pipes and structures that connect to existing structures.
Whenever you are laying out a pipe network, you have the option of connecting to existing pipe network parts. Autodesk Civil 3D gives you visual cues when the pipe or structure you are creating will either connect to an existing object or break a pipe to create a junction.
In the previous exercise, you used the Draw Pipes And Structures tool to place structures and pipes simultaneously. In this exercise, you will add catch basins using the Draw Structures Only tool, and then connect the catch basins to network using the Draw Pipes Only tool.
This exercise continues from Exercise 2: Creating a Pipe Network by Layout.
This exercise uses Pipe Networks-1B.dwg with the modifications you made in the previous exercise, or you can open Pipe Networks-1C.dwg from the tutorials drawings folder.
Add structures to the pipe network
 Eccentric Structure 48 Dia 18 Frame 24 Cone 5 Wall 6 Floor is selected.
Eccentric Structure 48 Dia 18 Frame 24 Cone 5 Wall 6 Floor is selected.  (downslope).
 (downslope).  Structures Only.
Structures Only. Add pipes to the pipe network
A connection marker  that indicates that the pipe can be attached to the structure is displayed.
 that indicates that the pipe can be attached to the structure is displayed. 
To continue to the next tutorial, go to Changing Pipe Network Properties.