common/comsoil1/layer(nsoilmx),mlayer(0:nsoilmx-1)
      common/comsoil2/inertiedat(ngridmx,nsoilmx),volcapa

      real layer      ! soil layer depths
      real mlayer     ! soil mid-layer depths
      real inertiedat ! soil thermal inertia
      real volcapa    ! soil volumetric heat capacity