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By default, flow simulations in MAGNET are run at steady state. To perform unsteady (transient) modeling
in MAGNET, check the box next to ‘Transient’ in the upper-right part of the Default Parameters and
Options Menu (see Figure 3-10). Required inputs are the start date and time (hour of the day), the time step,
and the simulation length. Use the texts boxes next to ‘State Date’ (year, month, day), ‘Hr’ (hours), ‘Time
Step:’ (days), and ‘Simulation Length’ (days) to define user inputs.
Check the box next to ‘Run Steady State at t=0’ to use the head distribution solved for steady state
conditions as the initial head distribution of the transient simulation (see Figure 3-10).

Other options for the initial head distribution are shown in Figure 3-11. The ‘Top’ option will use the Top
Elevation surface assigned by the user (see Section 3.3.1). The ‘Parent’ option uses the head distribution of
a larger Parent model spanning the new (Child) model domain (see Section 3.6). Head values are
interpolated from the (coarse-grid) Parent model to the (finer-grid) Child model. The ‘Constant’ option will
assign the value in the text box as a constant head value across the entire domain.

Figure 3-10: Options for unsteady (transient) modeling in MAGNET. Default values/parameters are shown.

Figure 3-11: Options for assigning an initial head distribution across the model domain. Default value/parameters
are shown.

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