I am working on my own project and try to creat a project for HEC-HMS. But I cant find the CN-grid option while deriving sub-basin parameter from raster CN-Grid input option is totally missing. I choose SCS method as loss and for Transform I also choose SCS.I put CN-grid layer in the same geodatabase. I am using Arc-GIS 10.2.0 with Hec-geohms10.2. Can anyone tell the possible reason why CN-grid input option is missing while manual that I have shows the option?
screen shot of my work is attached herewith.