What does Percent Not Converging Mean in SWMM5?
In SWMM 5 there is a Routing time step summary which tells the modeler the minimum time step during the simulation based on the CFL condition, the average time step, maximum time step, the percent of time spent in steady state, the average iterations per step and the percent not converging. The percent not converging means the percent of the time the link flows and node depths did not converge within the maximum number of trials per time step (Figure 1). ************************* Routing Time Step Summary ************************* Minimum Time Step : 0.52 sec Average Time Step : 8.76 sec Maximum Time Step : 10.00 sec Percent in Steady State : 0.00 Average Iterations per Step : 2.14 Percent Not Converging : 1.69 Figure 1. Maximum number of trials per time step The Percent Non Converging is the percent of time at least ONE link did not converge within the maximum number of trials per time step. The Per