SWMM56

SWMM   5   Link   Time   Step   Calculations It you select the variable  time   step  option in  SWMM   5  then the program will compute the CFL  time   step  for each  link  based on the ending system variables in the last  time   step  based on the following steps.  The smallest value of t is used for each  time   step  but often the same small set of links will be the controlling  time  for the whole simulation.  In the example shown below  link   1570c is controlling the  time   step  83 percent of the  time .  The  link   time   step  is usually the controlling  time   step .  

SWMM 5 Link Time Step Calculations It you select the variable time step option in SWMM 5 then the program will compute the CFL time step for each link based on the ending system variables in the last time step based on the following steps. The smallest value of t is used for each time step but often the same small set of links will be the controlling time for the whole simulation. In the example shown below link 1570c is controlling the time step 83 percent of the time. The link time step is usually the controlling time step.