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Use the text box next to ‘BotE:’ assign a bottom elevation of the source/sink (e.g., the lake bottom
-1
elevation).Use the text box next to ‘Leakance:’ to enter a value (units of day ) for the leakancy (a factor
representing hydraulic conductivity per unit thickness of the land surface).
Two-way source concentration. The two-way source/sink can be assigned a solute concentration for the
purposes of transport modeling (in the case that the zone is acting as a source). Enter a non-zero value in
the text box next to ‘Conc:’ (units: ppm) to apply a source concentration to the source/sink.

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 4-15). 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.
See Sections 5.2 and 6.1 for details on visualizing solute/contaminant transport results.

Figure 4-15: Sub-menu for editing transient lake concentration data.

One-way head-dependent flux. One-way head dependent flux allows water to leave the aquifer system in
the case that the hydraulic head exceeds the top aquifer elevation, but water may not enter the aquifer
system. To assign the zone as a one-way sink of water (e.g., seeps or springs), check the radio box next to
‘One-way’. The drop-down menu next to ‘Name’ provides different naming options for the zone feature
that will be used in displaying results, e.g., when performing water balance analyses (see Section 6.2). The
stage of the water sink can be assigned as:

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