The hydrologic objects and its immediate downstream objects are presented with an arrow pointing to the downstream objects. The arrow is called link in VO. To create a link on canvas:

  1. Move the mouse cursor on top of the source object icon.
  2. Keep left button pressed and move the mouse cursor on top of the downstream object icon.
  3. Release left button and the link will be created.

Some rules and guidelines for linking objects are given in Table 6-3. The link will not be added if the number of input or output links reaches the limit.

TABLE 6-3 RULES FOR HYDROLOGIC OBJECT LINKS

Hydrologic Object
  1. of Input Links
  1. of Output Links
Color
0 1 Black
1 1 Black
unlimited 1 Black
1 1 Black
1 5 Black
1 2 Minor: Red
Major: Black
0 1 Black

1 Up to 3 Over flow: Red
Out flow: Black
Underdrain: Orange

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