R2D_Ice Update Log September 30, 2002 Version 0.01 R2D_Ice is an interactive and graphical program intended for defining and editing ice topography files (extension .ice) for use in the River2D program. The structure of ice files is very similar to that of bed files except that the columns describing bed elevation and bed roughness height are used for ice thickness and ice roughness height respectively. The appearance and functionality of R2D_Ice is very similar to that if R2D_bed. This is the first release of R2D_Ice.