All time-dependent data must be referred to an arbitrary time reference, which is defined by the simulation time commands.
For 2D/1D models these are Start Time, End Time and Timestep in the .tcf file. For 1D Only models these are Start Time, End Time and Timestep in the .ecf file.
The starting time and finishing times specify the period in hours for which calculations are made. The timestep is the calculation interval in seconds, which is dependent on various conditions as described in Section 3.6. Prior to Build 2005-05-AN, for 2D/1D models the same timestep is used for both 2D and 1D schemes. In these cases, it is highly preferable that the 1D domains do not control the timestep, as 99% of the computational effort is in usually in solving the 2D domains.
The output data is controlled by the times set using Start Map Output and Start Time Series Output for the 2D domains, and Start Output for the 1D domain. All outputs are limited to the period between these times and the end time. In determining the maximum and minimum hydraulic values, every calculation time step is considered (see Store Maximums and Minimums for 2D domains, while for the 1D domains the maximums and minimums are always output).
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