Do not confuse the initial state of an element declared in EPANET with its state at a given moment obtained as a result of calculations.
The initial state of a transport element (pipe, pump, valve) can be Open, Closed, or Active (the latter applicable in the case of hydraulic valves). However, the final state of these same elements can admit more situations in addition to those three.
In particular, the EPANET Toolkit 2.3 API returns only two states (Open and Closed), extended to four in the case of pumps, but the Toolkit itself reports up to eight states in the binary output file, many of which are specific cases of the former. For example, a pipe feeding a tank may be temporarily closed because the tank is full or empty; a FCV valve may be temporarily fully open because it cannot supply the imposed target flow at that moment. These temporary states may change from one time step to another, which differentiates them from the permanent state defined as the initial state.
Although EPANET distinguishes up to eight different states, QGISRed identifies up to 13 states that cover all possible situations. For example, if a valve is temporarily closed, QGISRed differentiates the cause depending on its type and the imposed setpoint.
These states are reported in a new column in the results table and can be graphically visualized as an additional selectable magnitude for line elements, displayed in different colors according to a legend.
A tutorial explaining these thirteen states, their meaning, and their impact on calculations will be published shortly.
