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      subroutine dlwq60 ( deriv  , conc   , notot  , noseg  , itfact ,
     *                    amass2 , isys   , nsys   , dmps   , intopt ,
     *                    isdmp  )

!     Deltares Software Centre

!>\File
!>           scales DERIV after the user quality processes, for steady state computation.

!     CREATED: april 3, 1988 by L.Postma

!     LOGICAL UNITNUMBERS : none

!     SUBROUTINES CALLED  : none

      use timers

      implicit none

!     Parameters          :

!     type     kind  function         name                      description
      integer   (4), intent(in   ) :: notot                   !< total number of substances
      integer   (4), intent(in   ) :: noseg                   !< number of computational volumes
      real      (4), intent(inout) :: deriv (notot ,noseg)    !< derivatives to be scaled
      real      (4), intent(inout) :: conc  (notot ,noseg)    !< concentrations per substance per volume
      integer   (4), intent(in   ) :: itfact                  !< scale factor between clocks
      real      (4), intent(inout) :: amass2(notot , 5   )    !< mass balance array
      integer   (4), intent(in   ) :: isys                    !< 'this' substance
      integer   (4), intent(in   ) :: nsys                    !< number of substances
      real      (4), intent(inout) :: dmps  (notot,*)         !< dumped fluxes is intopt > 7
      integer   (4), intent(in   ) :: intopt                  !< Integration suboptions
      integer   (4), intent(in   ) :: isdmp (noseg)           !< Pointer dumped segments

!     Local declarations

      integer(4) iseg, i, ip   ! Loop and help variables

      integer(4) ithandl /0/
      if ( timon ) call timstrt ( "dlwq60", ithandl )

!         loop accross deriv and conc

      do iseg = 1    , noseg
         conc  (isys,iseg) = conc  (isys,iseg)/itfact
         do i    = isys , isys +nsys-1
            deriv (i,iseg) = deriv (i,iseg)/itfact
            amass2(i,   2) = amass2(i,   2) + deriv(i,iseg)
         enddo
      enddo

      if ( mod(intopt,16) .ge. 8  ) then
         do iseg = 1 , noseg
            ip = isdmp(iseg)
            if ( ip .gt. 0 ) then
               do i    = isys , isys +nsys-1
                  dmps(i,ip)= dmps(i,ip) + deriv(i,iseg)
               enddo
            endif
         enddo
      endif

      if ( timon ) call timstop ( ithandl )

      return
      end