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To assign time-varying recharge, check the radio box next to the ‘Transient’ button, and then LM click the
‘Transient button. This opens the ‘Transient Data for Recharge’ sub-menu (see Figure 4-17). Indicate the
starting data and time with the text boxes next to ‘State Date’ (year, month, day, hour). Then, provide the
following inputs for each timestep: TimeN – or the number of days since the starting date and time; and
ValueN – the recharge value corresponding to TimeN. The recharge values may be entered in any units;
however, if m/day are not used, make sure to enter the appropriate multiplier in the text box next to
‘Multiplier to m/day:’. For example, to convert from inch/year to m/day, enter 0.00006958, as 1 inch/year
= 0.00006958 m/day. After all desired changes have been made, LM click the ‘OK’ button. Or click
‘Cancel’ to discard all changes and close the sub-menu.

Figure 4-17: Sub-menu for editing transient recharge data.

Prescribed Source Concentration. Check the radio box next to ‘Recharge’ and enter a non-zero value (units:
inch/year) in the text box next to ‘Conc:’ to apply a prescribed source concentration (units: ppm) for all
model cells over which the zone extends. This value is steady (i.e., the same value will be applied for all
time-steps if performing transient simulations).

To assign time-varying source concentration, check the radio box next to the ‘Transient’ button, and then
LM click the ‘Transient button. This opens the ‘Transient Data for Recharge Concentration’ sub-menu (see
Figure 4-18). Indicate the starting data and time with the text boxes next to ‘State Date’ (year, month, day,
hour). Then, provide the following inputs for each timestep: TimeN – or the number of days since the
starting date and time; and ValueN – the concentration value corresponding to TimeN. The concentration
values may be entered in any units; however, if ppm are not used, make sure to enter the appropriate
multiplier in the text box next to ‘Multiplier to ppm:’. After all desired changes have been made, LM click
the ‘OK’ button. Or click ‘Cancel’ to discard all changes and close the sub-menu.

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