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Figure 4-1: Polyline feature added to the model domain and the Polyline Attributes menu.

4.1.1 Prescribed Head Options

Different prescribed head options can be applied using the Prescribed Head option box. The simplest
treatment is a constant values at all vertex locations (and at all time-steps, if running a transient simulation).

Spatially-constant prescribed head. Select the radio button next to ‘Constant’, and enter the desired head
value (in meters) in the text box. To assign spatially-constant but time-dependent head values, leave the
‘Constant’ radio button selected, but also check the radio box next to ‘Transient’. Then LM click the
‘Transient’ button to open the sub-menu for editing transient head data (see Figure 4-2). Indicate the starting
data and time with the text boxes next to ‘State Date’ (year, month, day), ‘Hr’ (hours). Then, provide the
following inputs for each timestep: TimeN – or the number
of days since the starting date and time; and ValueN – the
head value corresponding to TimeN. The head values may
be entered in any units; however, if meters are not used,
make sure to enter the appropriate multiplier in the text box
next to ‘Multiplier to meter:’. For example, to convert from
ft. to m, enter 0.3048, as 1 ft.=0.3048m.

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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