For MODFLOW, PHAST, and WellFootprint models, ColumnBoundaryPosition({Column}) returns the X coordinate in the grid coordinate system of the column boundary specified by its one optional argument Column. If the optional argument is not included, the function uses the column number of the node or element for which the formula is being calculated. For SUTRA and MODFLOW 6 DISV models, ColumnBoundaryPosition returns zero.
ColumnBoundaryPosition(1) returns the position of the leftmost edge of the grid in MODFLOW, PHAST, and WellFootprint.
