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Figure 4-19: Sub-menu for editing transient prescribed head data.

Prescribed Source Concentration. A zone can be assigned a solute source concentration for all model cells
over which it extends for the purposes of transport modeling. To do this, check the radio box next to ‘Source
Concentration’. To apply an instantaneous (delta-function) source concentration, select the radio button
next to ‘Instantaneous:’ and enter a value (units: ppm) in the text box provided. To apply a continuous
concentration (i.e. constant in time), select the radio button next to ‘Continuous:’ enter a value (units: ppm)
in the text box provided

To assign time-varying source concentration, check the radio box next to the ‘Transient’ button, and then
LM click the ‘Transient button Check the radio box next to the ‘Transient’ button to open the Transient
Data for Lake Concentration sub-menu (see Figure 4-20). 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 concentratoin 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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