The Pressure Dependent Demand is an option to address demand dynamics related to system pressure (i.e., impacts of system pressure on actual demand).
The Pressure Dependent Demand option in the Run Manger allows the user to create a hydraulic model that more accurately reflects "real-world" conditions. In some water systems, as pressure drops, the ability to deliver the modeled demand also decreases with respect to a decrease in system pressure.
The Pressure Dependent Demand option is accessed from the Standard tab of the Run Manager. It is applied only on junctions within a user-defined domain. In other words, it is enabled only when a domain exists. The user then creates and assigns a curve of % Demand vs. Pressure to the current simulation.