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enter a constant or an expression that references an object data field or
linked external database column. The expression will be evaluated for
each link. Click
(Expression Evaluator) to select data from a list.
■ Link Direction — Specify a direction for the trace. If you leave the
box blank, bi-directional (0) is used.
■ Reverse — Select this option to use the reverse of the direction
indicated in the Link Direction box.
■ Link Direct Resistance — Specify the resistance to travel in the
direction that a link was created. If you leave the box blank, the length
of the line (.LENGTH) is used.
■ Link Reverse Resistance — Specify the resistance in the opposite
direction along a link. If you leave the box blank, the length of the
line (.LENGTH) is used.
■ Node Resistance — Specify the resistance to cross the node, for
example, resistance for a valve in a pipe network, or a junction in a
road network. If you leave the box blank, zero (0) is used.
■ Specify a maximum resistance for the trace. The analysis determines
how many links and nodes can be traveled before the accumulated
resistance exceeds the specified maximum resistance.
For example, to trace out to a maximum length of 5000, set the Link
Direct Resistance to .LENGTH and set the Maximum Resistance to 5000.
To trace out to the first node on each link, set the Link Direct Resistance
to 0, set the Node Resistance to 50 and set a Maximum Resistance of 45.
8 Click Next.
9 In the Network Topology Analysis - Output dialog box, indicate whether
to view the results of the trace onscreen and whether save the flood trace
results as a new topology.
■ To view your flood trace onscreen, select Highlight. Select the highlight
color.
■ To save the flood path trace as a new topology, select Create Topology.
Enter a name and description for the new topology. The new topology
is created on the existing objects.
10 Click Finish to perform the flood trace.
Performing a Flood Trace | 1335