<< Click to Display Table of Contents >> Navigation:  Wadiso 6 User Guide > Time/Water quality simulation > Definition of Time/WQ Simulation Terms > Water Quality Sources

A water quality source is a node where flow enters the distribution system, and the flow has a known water quality or known quality parameters. Typical sources might be a water treatment works clear well, an unwanted contaminant intrusion, or a chlorine dosage point.

 

A water quality source can be designated as a concentration or booster source:

•A concentration source fixes the concentration of any external inflow entering the network, such as flow from a reservoir or from a negative demand placed at a junction.

•A mass booster source adds a fixed mass flow to that entering the node from other points in the network.

•A flow-paced booster source adds a fixed concentration to that resulting from the mixing of all inflow to the node from other points in the network.

•A setpoint booster source fixes the concentration of any flow leaving the node (as long as the concentration resulting from all inflow to the node is below the setpoint).

 

The concentration-type source is best used for nodes that represent source water supplies or treatment works (e.g., reservoirs or nodes assigned a negative demand). The booster-type source is best used to model direct injection of a tracer or additional disinfectant into the network, or to model a contaminant intrusion.

 

A water quality source can also be made to vary over time by assigning a time pattern to it.