The NETFLOW Procedure

The EXCESS=SUPPLY Option

If you specify the EXCESS=SUPPLY option, then there are three possible scenarios to deal with:

Case 1: No Node with Missing D Demand, THRUNET Not Specified (see Figure 5.33)


Drain the excess supply from all supply nodes.

Figure 5.33: Nodes with Missing S Supply, THRUNET Specified

Nodes with Missing S Supply, THRUNET Specified


Case 2: Some Nodes with Missing D Demand, THRUNET Not Specified (see Figure 5.34)


Drain the excess supply from nodes that have missing D demand values. If a node has a missing D demand value, then the amount it demands is determined by optimization. For a demand node with negative supdem value, that value negated is equal to the sum of flows on all actual arcs directed toward that node.

Figure 5.34: Nodes with Missing D Demand

Nodes with Missing D Demand


Case 3: THRUNET Specified (see Figure 5.35)


Drain the excess supply from all demand nodes. If a node has a negative supdem value, that value negated is the lower bound on the sum of flows on all actual arcs directed toward that node. If a node has a missing D demand value, then the amount it demands is determined by optimization.

Figure 5.35: Nodes with Missing D Demand, THRUNET Specified

Nodes with Missing D Demand, THRUNET Specified