CDN=CD_CS90.nc                      ! surf.drag coefficient
VEG=V_CS90_144X90_5percent.nc       ! veg
CROPS=CROPS_CS90.nc                 ! crops
SOIL=SOIL_CS90.nc                   ! soil/topography bdy.conds
TOP_INDEX=top_index_CS90.nc         ! only used if #define do_topmodel_runoff
ZVAR=ZVAR_CS90.nc                   ! topographic variance for gravity wave drag
GLMELT=GLMELT_CS90.nc               ! glacial melt distribution
