The Active Topology Alternative lets you temporarily remove areas of the network from the current analysis. This is useful for comparing the effect of proposed construction and to gauge the effectiveness of redundancy that may be present in the system.

The Active Topology dialog box is divided into tabs for each element type:

• Pump
• Manhole
• Catch basin
• Outfall
• Pond outlet structure
• Cross section node
• Wet well
• Pressure junction
• Junction chamber
• Conduit
• Channel
• Gutter
• Pressure Pipe
• Catchment
• Pond

For each tab, the same setup applies—the tables are divided into three columns. The first column displays whether the data is Base or Inherited, the second column is the element Label, and the third column allows you to choose whether or not the corresponding element is Active in the current alternative.

To make an element Inactive in the current alternative, clear the check box in the Is Active? field that corresponds to that element’s Label.

Related Topic

• "Creating an Active Topology Child Alternative"