This pane is on the MODFLOW Features tab of the Object Properties dialog box.
If there is over-consumption through evaporation of precipitation over bare soil, BARE_PRECIPITATION_CONSUMPTION_FRACTION imposes a limit on that consumption. BARE_PRECIPITATION_CONSUMPTION_FRACTION is defined as a fraction of precipitation that falls on bare surface that is available for consumption (evaporation).
It must be between 0 and 1, with a default value of 1 when not specified.
Precipitation that is not available for consumption becomes either runoff or deep percolation
Precipitation that is available for consumption, but does not evaporate becomes either runoff or deep percolation
This can be tied to Soil Conservation Service estimates of the fraction of consumption or can be user estimated.