The Units of Measurement for Slide models are specified on the General page of the Project Settings dialog. You may choose the Stress Units, Time Units and Permeability Units, as described below.
Stress Units
The Stress Units option allows you to choose either Metric or Imperial units. The selection of Stress Units determines the units of length, force, stress and unit weight, as summarized in the table below.

LENGTH 
FORCE 
STRESS 
UNIT WEIGHT 
Metric Units 
metres 
kN 
kN / m2 
kN / m3 
Imperial Units 
feet 
lbs 
lb / ft2 
lb / ft3 
All input dialogs will indicate the correct units to be entered, according to the units you have chosen.
Time Units
The Time Units are only applicable for finite element groundwater analysis, and determine the following:
The Time Units used to define stages for a transient groundwater analysis.
The Time Units used for time dependent output quantities such as discharge velocity and flow rate through discharge sections. This is applicable for both steady state and transient groundwater analysis.
You may choose from seconds, minutes, hours, days, months or years. Note: for computational purposes, 1 month is assumed to be 1/12 of a year or 365/12 = about 30.4 days.
If you are not performing finite element groundwater analysis, then the Time Units have no effect on input or output data.
Permeability Units
The Permeability Units are applicable if you are performing finite element groundwater seepage analysis, either steady state or transient. The available Permeability Units depend on the selection of Stress Units (metric or imperial). The selected Permeability Units determine the units of permeability in the Define Hydraulic Properties dialog.
If you are not performing finite element groundwater analysis, then the Permeability Units have no effect on input or output data.
NOTE: the Defaults button in the Project Settings dialog allows you to save the currently selected Units of Measurement as the default units for all new files.