A pipe junction node is used to transfer water from one place to another. It can be used to represent a pump station in water supply system.
In rule based ordering, to add a new pipe junction relationship:
Note: "Flow Volume" is the expected pump volume for the current time step. "Capacity for Forecast" is the maximum pump constraint which is used when there is travel time. The volume of pumped water is assumed to be the same as the expected pump volume even if there is a shortfall. So it is important to take all possible losses into consideration when defining the expected pump volume.
In NetLP, the process to add a pipe junction relationship are very similar to the one in rule based ordering. The only difference is the two parameters defined for each connection. In NetLP, "Capacity" is the maximum pump capacity for the connection relationship. It can be defined as a simple constant, a series of pump volume record or a function. "Cost" represents pump cost per ML. It can also be defined as a simple constant, a series of pump cost record or a function which can give different cost for different situation.