subroutine calsoft_read_codes
      
       use calibration_data_module
       use plant_data_module
       use input_file_module
       use soil_module
       use plant_module
       use hydrograph_module
       use hru_lte_module
       use sd_channel_module
       use organic_mineral_mass_module
       use mgt_operations_module
       use conditional_module
       
       implicit none
      
       character (len=80) :: titldum   !           |title of file
       character (len=80) :: header    !           |header of file
       integer :: eof                  !           |end of file
       logical :: i_exist              !none       |check to determine if file exists
       
       eof = 0

       inquire (file=in_chg%codes_sft, exist=i_exist)
       if (.not. i_exist .or. in_chg%codes_sft == "null") then
 !       allocate (cal_codes(0:0))
       else		            
         do 
           open (107,file=in_chg%codes_sft)
           read (107,*,iostat=eof) titldum
           if (eof < 0) exit
           read (107,*,iostat=eof) header
           if (eof < 0) exit
           read (107,*,iostat=eof) cal_codes
           if (eof < 0) exit
           exit
         enddo

         if (cal_codes%hyd_hru /= "n" .or. cal_codes%hyd_hrul == "y".or.    &
             cal_codes%plt == "y" .or. cal_codes%sed == "y" .or.            &
             cal_codes%nut == "y" .or. cal_codes%chsed == "y" .or.          &
             cal_codes%chnut == "y" .or. cal_codes%res == "y") cal_soft = "y"
	   end if
       
       close(107)
       return
      end subroutine calsoft_read_codes