Time Step Control Dialog (SWMM)

The date (month/day/year) and time of day when the simulation ends.

This must be on or after the Start analysis date and time.

The date (month/day/year) and time of day when reporting of simulation results is to begin.

This must be on or after the Start analysis date and time, and on or before the End analysis date and time.

The time interval for reporting of computed results.

Reporting time step should be the same or longer than the routing time step, and must not exceed 24:00:00.

Note that reported values are instantaneous values at the reporting time step and NOT averaged values.

The time step length used for runoff computations (consisting mainly of pollutant build up) during periods when there is no rainfall or no ponded water or when LID controls are dry.

The time step length must not exceed 24:00:00.

The time step length (in seconds) used for routing flows and water quality constituents through the selected SWMM network.

The time step length must not exceed 24:00:00.

The time step length used for evaluating Control Rules. A value of 0 (default) indicates that controls are evaluated at every routing time step.

A check in the box indicates that ICM should keep using the most recently computed system flows (instead of computing a new flow solution) whenever the System flow tolerance and Lateral flow tolerance are met.

Using this option can help speed up simulation run times at the expense of reduced accuracy.

The value at which the percent differences between the current lateral inflow and that from the previous time step for all points in the SWMM network are considered to represents a steady flow period.