How to use the Variable Time Step for Pumps and Force Mains in SWMM5 and InfoSWMM

Note: The variable time step option is a powerful feature of SWMM5 as it lets the engine determine the CFL time step needed for each time step (1). A good guide is to use a maximum time step 2 to 5 times bigger than the average time step during a simulation (2). Too large and too small a time step can cause continuity errors in a rapidly changing Pump/FM network (3).

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