Spatial Analyst Equation

Discussion created by heath.bishop on Feb 29, 2012
Latest reply on Feb 29, 2012 by Dan_Patterson
I have two rasters, one called Rain representing rainfall and one called Infill that contains a permeability value based on rock type.  I have an equation to measure the amount of runoff (the second equation gives the correct value).  The following two formulas are giving me different values...any idea why?  According to my thought process, the inside brackets shouldn't matter.  These equations are being populated into raster calculator.

Runoff =[rain] - ([rain] * ([infill] / 10))

Runoff = [rain] - ([rain] * [infill] / 10)

Any help would be appreciated.