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      real claygrav80rh, orggrav80rh

!     claygrav80rh - gravimetric water content of soil clay at 80% rh
!     orggrav80rh - gravimetric water content of soil organics at 80% rh

      parameter( claygrav80rh = 0.3 )  ! Montmorillonite from ten Berge, 1990
      parameter( orggrav80rh = 0.27 )  ! peat and muck from Rutherford and Chlou, 1992